Conference Agenda

Session Overview
Location: B031
Ground floor, 60 seats
 
Date: Monday, 12/Sept/2022
1:00pm - 2:30pmTutorial Benoit Boulanger
Location: B031

Title: Nonlinear optics for conversion of laser frequencies and generation of quantum states of light

https://www.europeanoptics.org/pages/events/eosam-2022/program/tutorials.html

Register for the tutorials here: https://forms.gle/BphPTqES82jx5LqL8

3:00pm - 4:30pmTutorial Ariel Guerreiro
Location: B031

Title: An introduction to quantum sensing as quantum information systems

You can find more information about the tutorials from the EOSAM website:
https://www.europeanoptics.org/pages/events/eosam-2022/program/tutorials.html

Register for the tutorials here: https://forms.gle/BphPTqES82jx5LqL8

5:00pm - 6:30pmTutorial Sebastien Bidault
Location: B031

Title: Nanoscale Emitters and Resonators: from a Weak to a Strong Coupling Regime

https://www.europeanoptics.org/pages/events/eosam-2022/program/tutorials.html

Register for the tutorials here: https://forms.gle/BphPTqES82jx5LqL8


 
Date: Tuesday, 13/Sept/2022
11:30am - 1:00pmTOM11 S01: Tapered optical fibers, from fundamental to applications: Nanofiber laser application
Location: B031
Session Chair: Philipp Schneeweiss, Humboldt-Universität zu Berlin, Germany
 
11:30am - 12:00pm
Invited
ID: 355 / TOM11 S01: 1
TOM 11 Tapered optical fibers, from fundamental to applications

Tapered multicore fibers for energy-scalable fiber laser systems

Christopher Aleshire1, Albrecht Steinkopff1, Arno Klenke1,2, Cesar Jauregui1, Steffen Böhme3, Tobias Koch3, Stefan Kuhn3, Johannes Nold3, Nicoletta Haarlammert3, Thomas Schreiber3, Jens Limpert1,2,3

1Institute of Applied Physics, Friedrich-Schiller-University Jena, Jena, Germany; 2Helmholtz-Institute Jena, Jena, Germany; 3Fraunhofer Institute for Applied Optics and Precision Engineering, Jena, Germany

With active multicore fibers (MCFs), many parallel amplifying waveguides can be densely assembled into a common glass cladding. A tapered fiber geometry applied to MCFs enhances the power- and energy scalability of these systems by increasing the doped waveguide volume and reducing peak irradiance while maintaining low output mode order. Recent high-energy experiments have achieved 37 mJ ns-class pulse energies with Yb-doped tapered MCFs, with potential application to a new generation of compact MCF-based coherently-combined laser systems. In this submission, latest experimental results with tapered MCFs and flexible fabrication of taper profiles as a post-draw processing step will be discussed. Numerical analyses of MCF tapers will be presented, using beam propagation method (BPM) and mode-decomposition techniques to study mode coupling and inter-core crosstalk. These simulations are used to guide the tapering of existing fibers and aid the design of future “taper-ready” MCFs.



12:00pm - 12:15pm
ID: 201 / TOM11 S01: 2
TOM 11 Tapered optical fibers, from fundamental to applications

High peak/average power picosecond pulsed MOPA system with tapered large mode area double-clad Yb-doped fiber

Vasilii Ustimchik, Evgenii Motorin, Valery Filippov

Ampliconyx Oy, Finland

We present a near single-mode narrow band high power pulsed MOPA laser system works from 1 to 20 MHz repetition rate and delivered over 600 W of average power at 20 MHz (600kW of peak power and 30 µJ pulse energy) and over 3 MW of peak power at 1 MHz with spectral bandwidth lower than 210 pm.



12:15pm - 12:30pm
ID: 218 / TOM11 S01: 3
TOM 11 Tapered optical fibers, from fundamental to applications

Study of laser induced temperature variation in silica nanofibers

Sylvie Lebrun1, Yanis Abdedou1, Mondher Besbes1, Philippe Delaye1, Jean-Charles Beugnot2, Jacques Chrétien2, Maxime Romanet2, Simon Colombel2, Jérôme Salvi2, Maxime Zerbib2, Kien Phan Huy2

1Laboratoire Charles Fabry, France; 2Institut FEMTO-ST, France

After presenting a theoretical modelling based on the heat equation, we show two different experiments to measure the laser induced temperature variation in silica nanofibers in air, a direct one and an indirect one based on Brillouin scattering, leading to an estimated value of the convective parameter h.



12:30pm - 1:00pm
Invited
ID: 202 / TOM11 S01: 4
TOM 11 Tapered optical fibers, from fundamental to applications

Tapered hollow-core photonic crystal fibers

Frédéric Gérôme1,2, Jonas Osorio1, Foued Amrani1,2, Benoit Debord1,2, Fetah Benabid1,2

1GPPMM group, Xlim research institute, France; 2GLOphotonics

In this communication, we will first review the recent advances of hollow-core photonic crystal fibers. Then, the possibility offered to tailor their optical properties by making tapers will be discussed.

 
2:30pm - 4:00pmTOM11 S02: Tapered optical fibers, from fundamental to applications: Quantum application
Location: B031
Session Chair: Jean-Charles Beugnot, FEMTO-ST/CNRS, France
 
2:30pm - 3:00pm
Invited
ID: 353 / TOM11 S02: 1
TOM 11 Tapered optical fibers, from fundamental to applications

Integrated single photons sources based on tapered optical nanofibers

Quentin Glorieux

LKB, France

Integrated single photons sources based on tapered optical nanofibers



3:00pm - 3:15pm
ID: 131 / TOM11 S02: 2
TOM 11 Tapered optical fibers, from fundamental to applications

Using optical nanofibres to mediate cold atom interactions

Sile Nic Chormaic

OIST Graduate University, Japan

We discuss several recent advances related to optical nanofibres in cold atom systems, including two-colour dipole trap optimisation using an in-loop stochastic artificial neural network machine learner, upper bound limitations on Rydberg atom excitation due to localised ion formation, spectral lineshapes arising from the high intensity evanescent fields, and two-photon processes mediated via the evanescent field of the optical nanofibre



3:15pm - 3:30pm
ID: 235 / TOM11 S02: 3
TOM 11 Tapered optical fibers, from fundamental to applications

Rydberg atoms in the vicinity of an optical nanofiber

Erwan Stourm1, Maxence Lepers2, Jacques Robert1, Sile Nic Chormaic3, Klaus Mølmer4, Etienne Brion5

1Université Paris-Saclay, CNRS, Laboratoire de physique des gaz et des plasmas, 91405, Orsay, France; 2Laboratoire Interdisciplinaire Carnot de Bourgogne, CNRS, Université de Bourgogne Franche-Comté, 21078 Dijon, France; 3Light-Matter Interactions for Quantum Technologies Unit, Okinawa Institute of Science and Technology Graduate University, Onna, Okinawa, 904-0495, Japan; 4Department of Physics and Astronomy, Aarhus University, Ny Munkegade 120, DK-8000 Aarhus C, Denmark; 5Laboratoire Collisions Agrégats Réactivité, IRSAMC and UMR5589 du CNRS, Université de Toulouse III Paul Sabatier, F-31062 Toulouse Cedex 09, France

Highly excited (so-called Rydberg) atoms are the key ingredient of many quantum information

schemes. In this presentation, we shall theoretically investigate how spontaneous emission properties and van

der Waals interactions of such atoms are modified in the neighbourhood of an optical nanofiber with respect

to the free-space (vacuum) case. This work constitutes a very preliminary step towards the realization of a

quantum network based on atomic ensembles linked via optical nanofibers.



3:30pm - 3:45pm
ID: 188 / TOM11 S02: 4
TOM 11 Tapered optical fibers, from fundamental to applications

Gas-pressure tuning of wavelength of photon pair emitted by Four-Wave-Mixing in Nanofibers

Agathe Bonifacio1, Sylvie Lebrun1, Maxime Zerbib2, Maxime Romanet2, Jean-Charles Beugnot2, Philippe Delaye1

1Laboratoire Charles Fabry, Université Paris Saclay, France; 2Institut FEMTO-ST, Université Bourgogne Franche-Comté, France

We present experimental results demonstrating the possibility to tune the wavelength of the photon pair emitted through four wave mixing in a nanofiber, using the pressure of a gas surrounding the nanofiber. Using Argon, a shift of idler wavelength of -1.1nm/bar is measured demonstrating fine adjustment possibility of emission wavelength, allowing to choose between different WDM channels.



3:45pm - 4:00pm
ID: 176 / TOM11 S02: 5
TOM 11 Tapered optical fibers, from fundamental to applications

Non-reciprocal amplification of light using cold atoms coupled to an optical nanofiber

Sebastian Pucher, Christian Liedl, Shuwei Jin, Arno Rauschenbeutel, Philipp Schneeweiss

Humboldt-Universität zu Berlin, Germany

Optical nanofibers realized as the waist of tapered silica fibers can be used to trap and optically interface laser-cooled atoms. Building on this system, we experimentally show a novel scheme for the non-reciprocal Raman amplification of light. While typically either the magneto-optical effect, a temporal modulation or an optical nonlinearity is employed to break reciprocity, in our approach, this results from the spin of the atoms forming the gain medium. By taking advantage of the inherent spin-momentum locking present in optical nanofibers, we perform an experiment in which we set the amplification direction by a suitable preparation of the atomic spin state. Our approach is general and, suitable quantum emitters provided, could also be implemented beyond the optical domain of the electromagnetic spectrum.

 
4:30pm - 6:00pmTOM11 S03: Tapered optical fibers, from fundamental to applications: Nanofiber component
Location: B031
Session Chair: Sylvie Lebrun, Laboratoire Charles Fabry, France
 
4:30pm - 5:00pm
Invited
ID: 354 / TOM11 S03: 1
TOM 11 Tapered optical fibers, from fundamental to applications

Bragg gratings and bio-bragg-gratings in tapered optical fibers

Martina Delgado Pinar, Antonio Díez, Jose Luis Cruz, Miguel V. Andrés

University of Valencia, Spain

Bragg Gratings and Bio-Bragg-Gratings in Tapered Optical Fibers



5:00pm - 5:15pm
ID: 227 / TOM11 S03: 2
TOM 11 Tapered optical fibers, from fundamental to applications

Nonlinear optical fiber couplers made of chalcogenide glass

Mohsen Rezaei1, Md Hosne Mobarak Shamim1, Mohammed El Amraoui2, Younes Messaddeq2, Martin Rochette1

1McGill University, Canada; 2Laval University, Canada

We demonstrate chalcogenide optical fiber couplers designed with a transmission spectrum response that varies with input power. The measured critical power is as low as 126 W at a wavelength of 1938 nm.



5:15pm - 5:30pm
ID: 156 / TOM11 S03: 3
TOM 11 Tapered optical fibers, from fundamental to applications

Optical nanofibers for signal delaying

Alexandre Matic, Adrien Godet, Jacques Chrétien, Kien Phan-Huy, Jean-Charles Beugnot

FEMTO-ST Institute, Université Bourgogne Franche-Comté, CNRS UMR 6174, 25030 Besançon, France

In this abstract, we purpose an optical delay line based on optical nanofibers. Silica high elasticity and the low pulling force required to stretch a nanofiber allow to get optical delays up to 20 picoseconds with a 10 centimeter-long optical nanofiber at telecommunications wavelength.



5:30pm - 5:45pm
ID: 133 / TOM11 S03: 4
TOM 11 Tapered optical fibers, from fundamental to applications

Experimental investigation of light-matter interaction when transitioning from cavity QED to waveguide QED

Daniel Lechner, Riccardo Pennetta, Martin Blaha, Philipp Schneeweiss, Jürgen Volz, Arno Rauschenbeutel

Humboldt University Berlin, Germany

Cavity quantum electrodynamics (cavity QED) is conventionally described by the Jaynes- or Tavis-Cummings model, where quantum emitters couple to a single-mode cavity. The opposite scenario, in which an ensemble of emitters couples to a single spatial mode of a propagating light field, is described by waveguide QED, where emitters interact with a continuum of frequency modes. Here we present an experiment where an ensemble of cold atoms strongly couples to a fiber-ring resonator with variable length containing an optical nanofiber. By changing the length of the resonator we can tailor the density of frequency modes and thus explore the transition from cavity QED to waveguide QED. We analyse the response of the ensemble--cavity system after the sudden switch-on of resonant laser light and find that for progressively longer resonators, the Rabi oscillations typical of cavity QED disappear and the single-pass dynamics of waveguide QED appear. Our measurements shed light on the interplay between the single-pass collective response of the atoms to the propagating cavity field and the ensemble--cavity dynamics.

 

 
Date: Wednesday, 14/Sept/2022
2:30pm - 4:00pmTOM10 S01: Frontiers in Optical Metrology: Scatter techniques
Location: B031
Session Chair: Juergen Czarske, TUD, Germany
 
2:30pm - 3:00pm
Invited
ID: 265 / TOM10 S01: 1
TOM 10 Frontiers in Optical Metrology

Practical limits and opportunities with speckle metrology

Mikael Sjödahl

Luleå University of Technology, Sweden

In this presentation, the role of speckles as a carrier of information in phase-based optical metrology is re-visited. Starting with the fundamental mechanisms for speckle decorrelation it is shown that information about the state of an object is transferred through the modified mutual coherence function and can be detected either through the phase, speckle movement, speckle decorrelation or as a combination. The presentation is focusing on practical scale laws that set the limit for what is possible to achieve with present day technology and is demonstrated with a few examples incorporating measurements of microstructural changes, strain, shape, lenses and other refractive index objects.



3:00pm - 3:15pm
ID: 111 / TOM10 S01: 2
TOM 10 Frontiers in Optical Metrology

Influence of displacement gradients on laser speckle photography

León Schweickhardt1, Andreas Tausendfreund1, Dirk Stöbener1,2, Andreas Fischer1,2

1University of Bremen, Bremen Institute for Metrology, Automation and Quality Science (BIMAQ), Germany; 2University of Bremen, MAPEX Center for Materials and Processes, Germany

The influence of first and second order displacement gradients on laser speckle photography is investigated in a simulative study that is supported with experimental data. The systematic error is found to scale linearly with the second order gradient, while the random error scales with the first order gradient. The gradient-based error dominates the uncertainty budget of an in-process measurement during single tooth milling close to the machined surface.



3:15pm - 3:30pm
ID: 217 / TOM10 S01: 3
TOM 10 Frontiers in Optical Metrology

Coherent Fourier scatterometry for particle detection on structured surfaces

Anubhav Paul, Dmytro Kolenov, Silvania F. Pereira

TU Delft, Netherlands, The

We demonstrate the detection of particles/contamination present on a structured surface using Coherent Fourier scatterometry (CFS) by applying Fourier filtering to the scanned maps, which eliminates background effects due to the electronic noise as well the structure itself. We show that by using filters in the Fourier space we can significantly improve the detection capabilities of the particles present on the structure.



3:30pm - 3:45pm
ID: 257 / TOM10 S01: 4
TOM 10 Frontiers in Optical Metrology

Coherent Fourier Scatterometry for defect detection on SiC samples

Jila Rafighdoost, Dmytro Kolenov, Silvania F. Pereira

Delft University of Technology (TU Delft), Netherlands, The

Coherent Fourier Scatterometry (CFS) is a scatterometry technique that has been applied for grating and nanoparticle detection. Here, it has been challenged to verify the detectability of the so-called killer defects on SiC samples for power electronic applications. It has been shown that CFS is able to precisely recognize these defects regardless of their shape or size. CFS could be considered as a possible alternative for this purpose.



3:45pm - 4:00pm
ID: 197 / TOM10 S01: 5
TOM 10 Frontiers in Optical Metrology

Characterisation of nanowire structures with scatterometric and ellipsometric measurements

Jana Grundmann, Tim Käseberg, Bernd Bodermann

Physikalisch-Technische Bundesanstalt (PTB), Bundesallee 100, 38116 Braunschweig, Germany

Nanowire structures arranged in a hexagonal lattice are to be characterized in terms of their diameter, height and pitch. A scatterometer and an imaging Mueller matrix ellipsometer, which is a combination of a commercial Mueller matrix ellipsometer and a microscope, have been used as measurement tools. These measurements are supported by numerical simulations using the finite element method to characterize the structure parameters.

 
4:30pm - 6:00pmTOM10 S02: Frontiers in Optical Metrology: Interferometry
Location: B031
Session Chair: Ralf B. Bergmann, BIAS, Germany
 
4:30pm - 5:00pm
Invited
ID: 305 / TOM10 S02: 1
TOM 10 Frontiers in Optical Metrology

Toward tomography imaging of acoustic fields using digital holography

Pascal Picart, Saoucene Hassad

Le Mans University, France

The characterization and control of waves in acoustics, and more generally in wave physics, is of great interest because resulting technological innovations may impact several domains: environmental and energy transition, health sector, and industrial sector in the broadest sense. The characterization requires to develop new approaches to provide qualitative and quantitative insight of the acoustic fields of interest. Generally, imaging acoustic fields is performed by using microphone arrays which have a low spatial resolution. Here, we aim at demonstrating the proof-of-concept of simultaneous full-field and multi-view imaging of acoustic field in the free space using digital color holography and a single monochromatic high-speed sensor. The simultaneous acquisition of the necessary set of data is thus realized "single shot" and then numerical process yields images of both the amplitude and phase of the acoustic field along three different directions of observation. This has for advantage of permitting consistent and rapid data acquisition. We present the first experimental results and the first tomographic reconstruction of an acoustic field propagating in the free-field at 40 k Hz.



5:00pm - 5:15pm
ID: 183 / TOM10 S02: 2
TOM 10 Frontiers in Optical Metrology

Investigation of dynamic influences in tilted-wave interferometry

Gregor Scholz, Michael Schulz, Ines Fortmeier

Physikalisch-Technische Bundesanstalt (PTB), Germany

Aspherical and freeform lenses allow for compact optical systems and have therefore gained high interest in optics. The interferometric measurement of these forms is a challenge, for which the tilted-wave interferometer (TWI) has been developed. To evaluate the measurement uncertainty of the TWI, both the static and the dynamic influence parameters have to be investigated. In this work, we focus on the dynamic influences on the measurement data of the interferometer. To this end, the individual influences as well as their point of insertion into the process chain are identified. Then the measurement of the interferogram data is modelled as a Monte Carlo simulation. The propagation of different influences through the data process chain to the optical path length differences (OPDs) is also simulated, and the resulting variation of the OPDs is estimated. Furthermore, the variation of the OPDs resulting from measured interferogram data is investigated for comparison. The analysis and quantification of variation of the OPDs along with its contributing influence sources are important steps on the way towards a full uncertainty estimation of optical form measurement with the TWI.



5:15pm - 5:30pm
ID: 290 / TOM10 S02: 3
TOM 10 Frontiers in Optical Metrology

Quasi-analytical and rigorous modeling of interference microscopy

Tobias Pahl, Johannes Breidenbach, Peter Lehmann

University of Kassel, Germany

We present an extended vectorial Kirchhoff model of coherence scanning interferometry including several vector rotations occurring in the imagining and scattering process as well as polarization dependent reflection coefficients. For validation simulated results are compared to those of the conventional scalar Kirchhoff model and a rigorous finite element modeling.



5:30pm - 5:45pm
ID: 289 / TOM10 S02: 4
TOM 10 Frontiers in Optical Metrology

Low divergence structured beam In view of precise long-range alignment

Miroslav Sulc1,2, Jean-Christophe Gayde3

1Technical University of Liberec, Czech Republic; 2Institute of Plasma Physics of the Czech Academy of Sciences, Czech Republic; 3CERN, Switzerland

A new method of generation of a Structured Laser Beam (SLB) with non-diverging central core was proposed and is promising for creating long distance multipoint alignment systems. This beam is generated by a set-up consisting of two convex lenses in Kepler telescope arrangement. The first one is a high refractive index ball lens, second one is a standard lens. The beam, in cross-section consisting of light and dark concentric circles, propagates over a large distance. The central core of the SLB has a very small divergence which can be tuned. A divergence of 10 μrad was proven experimentally. In this experiment, the small initial beam core diameter of 10 μm, and its diameter of 1.5 mm at a distance of 150 m, show its ability for use as a multipoint fiducial reference line. This small beam divergence seemingly lies beyond the diffraction limit for laser beams.



5:45pm - 6:00pm
ID: 393 / TOM10 S02: 5
TOM 10 Frontiers in Optical Metrology

Holographic single-image depth reconstruction

Simon Hartlieb, Christian Schober, Tobias Haist, Stephan Reichelt

Institut für Technische Optik, Universität Stuttgart, Germany

In this article a camera-based single-image sensor is presented, that is able to measure the distance of multiple object points. The experimental results show an accuracy of 8,51 µm within a depth range of 20 mm. The sensor consists of a camera, whose lens is upgraded with a diffractive optical element (DOE). It fulfils two tasks: adding a vortex point spread function (PSF) and replication of the vortex PSFs to a predefined pattern of K spots. Both, shape and rotation of the vortex PSF is sensitive to defocus. By applying the depth reconstruction to each of the K replications and averaging the results, we experimentally show, that the reconstruction of the depth signal can be improved by a factor of up to 3.

 

 
Date: Thursday, 15/Sept/2022
8:30am - 10:00amTOM10 S03: Frontiers in Optical Metrology: Imaging techniques and resolution
Location: B031
Session Chair: Ivano Ruo Berchera, INRIM, Italy
 
8:30am - 9:00am
Invited
ID: 341 / TOM10 S03: 1
TOM 10 Frontiers in Optical Metrology

Achieving the ultimate optical resolution

Luis L. Sanchez-Soto1,2, Zdenek Hradil3, Jaroslav Rehacek3, Benjamin Brecht4, Christine Silberhorn4

1Universidad Complutense de Madrid, Spain; 2Max Planck Institute for the Science of Light, Erlangen, Germany; 3Department of Optics, Palacky University, Olomouc, Czech Republic; 4Integrated Quantum Optics Group, Paderborn University, 33098 Paderborn, Germany

The accurate estimation of the separation between two signals is at the core of many modern technologies. We show new quantum-inspired schemes able to estimate that separation at the quantum limit. The method works in the spatial, temporal, and frequency domains. The question of whether the optical coherence brings any metrological advantage to mode projections is discussed.



9:00am - 9:15am
ID: 132 / TOM10 S03: 2
TOM 10 Frontiers in Optical Metrology

A virtual microscope for simulation of Nanostructures

Poul-Erik Hansen1, Lauryna Siaudinyte2

1DFM, Denmark; 2VSL, The Netherlands

Light-matter interplay is widely used for analyzing the topology of surfaces on small scales for use in areas such as nanotechnology, nanoelectronics, photonics, and advanced materials. Conventional optical microscope imaging methods are limited in resolution to a value comparable to the wavelength, the so-called Abbe limit, and cannot be used to measure nano-sized structures. Scatterometry is an optical method that can measure structures smaller than the wavelength. However, the relative uncertainties of the structure dimensions measured with scatterometry increase with decreasing structure size, and the industry is therefore looking for replacing simple intensity based scatterometry with a phase-sensitive measurement method such as coherent Mueller ellipsometry. In this work, we present a virtual microscope capable of simulating the coherent Mueller ellipsometry and scatterometry response from one-dimensional and two-dimensional periodic structures. Furthermore, we argue that coherent nonnormalized Mueller ellipsometry gives results with less uncertainties than standard normalized Mueller ellipsometry.



9:15am - 9:30am
ID: 178 / TOM10 S03: 3
TOM 10 Frontiers in Optical Metrology

Polarization dependency of the 3D transfer behavior in microsphere enhanced interferometry

Lucie Hüser, Tobias Pahl, Peter Lehmann

University of Kassel, Germany

Enhancing the lateral resolution limit in optical microscopy and interferometry is of great interest in recent research. In order to laterally resolve structures including feature dimensions below the resolution limit, microspheres applied in the optical near-field of the specimen are shown to locally improve the resolution of the imaging system. Experimental and simulated results following this approach obtained by a high NA Linnik interferometer are analyzed in this contribution. For further understanding of the transfer characteristics, measured interference data are compared with FEM (finite element method) based simulations with respect to the polarization dependency of the relevant image information.



9:30am - 9:45am
ID: 113 / TOM10 S03: 4
TOM 10 Frontiers in Optical Metrology

Influence of camera temperature on MTF measurements with finite image distance

Markus Schake, Michael Schulz

PTB, Germany

Line Spread Function (LSF) based Modulation Transfer Function (MTF) measurements with finite image distance are sensitive to displacement errors in axial direction. Axial displacements between the sample and camera detector cause defocusing and thus, a MTF error proportional to the axial gradient of the sample's MTF. This article demonstrates the influence of the camera temperature on the focus position in the MTF reference setup at PTB.

 
4:00pm - 5:30pmTOM10 S04: Frontiers in Optical Metrology: Non-classical and non conventional methods
Location: B031
Session Chair: Bernd Bodermann, Physikalisch-Technische Bundesanstalt, Germany
 
4:00pm - 4:30pm
Invited
ID: 342 / TOM10 S04: 1
TOM 10 Frontiers in Optical Metrology

From quantum imaging to quantum reading and pattern recognition by quantum correlations

Ivano Ruo Berchera

INRIM, Italy

The use of quantum states of light, such as entanglement and squeezing, allows surpassing the limitation of conventional measurement essentially increasing the amount information extracted about an object under investigation for a fixed probing energy. While quantum metrology deals with the estimation of an unknown value of a parameters encoded in a state or a physical transformation

(quantum channel), quantum hypothesis testing deals with the discrimination among discrete values characterized beforehand.



4:30pm - 4:45pm
ID: 300 / TOM10 S04: 2
TOM 10 Frontiers in Optical Metrology

Reconstruction of coherence matrix in x-representation using nonclassical Hartmann sensor

Marek Vitek1, Michal Peterek1, Dominik Koutny1, Martin Paur1, Bohumil Stoklasa1, Libor Motka1, Zdenek Hradil1, Jaroslav Rehacek1, L.L. Sanchez-Soto2

1Palacky University, Czech Republic; 2Universidad Complutense Madrid

We show the coherence properties of a signal can be measured by a Hartmann wavefront sensor in a nonclassical regime. Recasting the detection theory of the classical Hartmann sensor in the sense of quantum tomography enables to measure the coherence function, which is an analogy to the density matrix of mixed quantum states. Two methods were tested for the reconstruction of the coherence matrix from the intensity scan in the nonclassical mode of the Hartmann sensor. The reconstruction was performed in a classic way using the POVM matrix and using data pattern tomography.



4:45pm - 5:00pm
ID: 275 / TOM10 S04: 3
TOM 10 Frontiers in Optical Metrology

Stokes CMOS polarimetry limits studied at non-classical polarisation states

Eva Roiková, Štěpán Kunc

Technical University of Liberec, Czech Republic

We present the study of the two polarisation state analysers. The first consists of a polarisation camera with a removable QWP, and the second consists of a non-polarisation camera with a rotating QWP and a stationary linear polariser. The theoretical analysis and experiment focus on studying the influence of polarimeter optical components accuracy and errors such as retardation errors, misalignments and extinction ratio on Stokes parameters precision. This research is a cornerstone to understanding polarisation state analysers limits. We examined laser beams with non-classical polarisation distribution, namely the Poincaré beam and the beam with radial polarisation.



5:00pm - 5:15pm
ID: 304 / TOM10 S04: 4
TOM 10 Frontiers in Optical Metrology

Fabrication influences on a miniaturised stokes polarimeter consisting of stacked nano-optical wire grid polarizer and retarders

Thomas Siefke, Markus Walther, Carsten Stock, Uwe Zeitner

FSU Jena, Germany

The polarization properties of light can be fully controlled with nano-optical wire grid polarizers and artificial birefringent grating structures. We demonstrate an integrated polarimeter based on stacked layers of such elements. However, the optical performance of such elements is fundamentally limited and may be further altered by deviations arising from the fabrication processes. In this contribution we investigate the influences on the polarimetry performance for such a device.

 

 
Date: Friday, 16/Sept/2022
8:30am - 10:00amTOM10 S05: Frontiers in Optical Metrology: Microscopy
Location: B031
Session Chair: Poul-Erik Hansen, DFM, Denmark
 
8:30am - 9:00am
Invited
ID: 359 / TOM10 S05: 1
TOM 10 Frontiers in Optical Metrology

Can brillouin microscopy really measure mechanical properties of biomedical samples?

Török Peter

Nottingham Trent University, United Kingdom

Can Brillouin microscopy really measure mechanical properties of biomedical samples?



9:00am - 9:15am
ID: 299 / TOM10 S05: 2
TOM 10 Frontiers in Optical Metrology

Elementary, my dear Zernike: model order reduction for accelerating optical dimensional microscopy

Phillip Manley1,2, Jan Krüger3, Lin Zschiedrich1,2, Martin Hammerschmidt1,2, Bernd Bodermann3, Rainer Köning3, Philipp-Immanuel Schnieder1,2

1JCMwave GmbH, Bolivarallee 22, 14050 Berlin, Germany; 2Zuse Institute Berlin, Takustraße 7, 14195 Berlin, Germany; 3Physikalisch-Technische Bundesanstalt, Bundesallee 100, 38116 Braunschweig, Germany

Dimensional microscopy is an essential tool for non-destructive and fast inspection of manufacturing processes. Standard approaches process only the measured images. By modelling the imaged structure and solving an inverse problem, the uncertainty on dimensional estimates can be reduced by orders of magnitude. At the same time, the inverse problem needs to be solved in a timely manner. Here we present a method of accelerating the inverse problem by reducing images to their elementary features, thereby extracting the relevant information and distinguishing it from noise. The resulting reduction in complexity allows the inverse problem to be solved more efficiently by utilize cutting edge machine learning based optimization techniques. By employing the techniques presented here, we are able to perform for highly accurate and fast dimensional microscopy.



9:15am - 9:30am
ID: 125 / TOM10 S05: 3
TOM 10 Frontiers in Optical Metrology

Near-process indirect surface characterization of laser-chemically produced removal contours

Merlin Mikulewitsch1, Dirk Stöbener1,2, Andreas Fischer1,2

1University of Bremen, Bremen Institute for Metrology, Automation & Quality Science (BIMAQ), Linzer Str. 13, 28359 Bremen, Germany; 2MAPEX Center for Materials and Processes, P. O. box 330 440, 28334 Bremen, Germany

The manufacturing rate of laser chemical machining (LCM) is currently restricted to avoid disruptive boiling bubbles in the process fluid. An increase necessitates adjustments to the laser beam or fluid properties. However, the current understanding of the surface removal mechanisms is insufficient to achieve a consistent removal quality under these conditions. For an improved process modeling, in-process measurements of the surface geometry, the surface temperature and the boiling bubbles are required. Due to the complex process environment, no suitable in-process measurement technique for the geometry or surface temperature exists. This contribution presents an indirect geometry measurement approach based on confocal fluorescence microscopy that offers the potential for near-process application in the LCM process environment. As a result, the micro-geometry of different surfaces is shown to be indirectly measurable under LCM-equivalent process conditions such as thick fluid layers or gas bubbles in the beam path. Furthermore, a combined fluorescence-based measurement of geometry and temperature is proposed.



9:30am - 9:45am
ID: 232 / TOM10 S05: 4
TOM 10 Frontiers in Optical Metrology

Alignment autocollimator-based microscope adjustment and its quality assessment

Jan Krüger, Detlef Bergmann, Matthias Sturm, Wolfgang Häßler-Grohne, Rainer Köning, Bernd Bodermann

Physikalisch-Technische Bundesanstalt (PTB), Germany

We report a custom microscope setup whose mechanical and optical components are adjusted by the means of an alignment autocollimator (AAC). Residual centring and angular misalignments of the components towards the microscope’s optical axis are below 500 µm and 1 mrad, respectively. We further perform measurements of dot structures with diameters close to the diffraction limit (nominal diameter = 200 nm; chrome on glass mask) as suitable measures for the evaluation of the microscope’s adjustment and to determine/ visualize the optical aberrations, which affect the image formation of microscopes.



9:45am - 10:00am
ID: 207 / TOM10 S05: 5
TOM 10 Frontiers in Optical Metrology

Nanoform evaluation approach using Mueller matrix microscopy and machine learning concepts

Tim Käseberg1, Jana Grundmann1, Stefanie Kroker2, Bernd Bodermann1

1Physikalisch-Technische Bundesanstalt, Germany; 2Institut für Halbleitertechnik, Laboratory for Emerging Nanometrology, Technische Universität Braunschweig, Germany

We realized an imaging Mueller matrix microscope for nanostructure characterization. For investigations on nanoform characterization via Mueller matrix images, we measured and simulated Mueller matrix images of specially designed nanostructures. As an approach towards machine learning evaluation in imaging ellipsometry, we calculated Haar-like features of the images and observed a higher sensitivity to subwavelength features in off-diagonal matrix elements compared to microscopy.