Session Overview  
Location: B328 3rd floor, 32 seats 
 
11:30am  1:00pm  TOM12 S01: Optofluidics: Morphological Optofluidics Location: B328 Session Chair: Paulo Marques, University of Porto & INESCTEC, Portugal 

11:30am  12:00pm
Invited ID: 324 / TOM12 S01: 1 TOM 12 Optofluidics Microdroplet lasers and their applications ^{1}Condensed Matter Department, J. Stefan Institute, Jamova 39, SI1000 Ljubljana, Slovenia; ^{2}Faculty of Mathematics and Physics, University of Ljubljana, Jadranska 19, SI1000, Ljubljana, Slovenia; ^{3}CENN Nanocenter, Jamova 39, SI1000 Ljubljana, Slovenia Biointegrated lasers, that are lasers made of biological and biocompatible materials and implanted into cells and tissues, are gaining interest from the research community. Here we show how whispering gallery mode microlasers and microcavities made of solid beads or droplets can be used for sensing different processes in biological materials including inside cells. By making microcavities of a predefined size they can also be used to encode some information and for cell tracking. Sensing and tracking can be applied to highly scattering tissues. 12:00pm  12:15pm
ID: 151 / TOM12 S01: 2 TOM 12 Optofluidics Imprinting characteristics of droplet lenses on liquidrepelling surfaces into light ^{1}Institute of Applied Physics, University of Muenster, Germany; ^{2}Geballe Laboratory for Advance Materials, Stanford University, USA; ^{3}Center for Soft Nanoscience, University of Muenster, Germany; ^{4}Department of Engineering Physics, Muenster University of Applied Sciences, Germany We propose an experimental method that allows the investigation of droplets on liquidrepelling surfaces. The described technique goes beyond the standard imaging approaches and reveals a plethora of spatial droplet information, which is usually unavailable. Liquid droplet lenses shape the transmitted light field of a Gaussian laser beam passing though them, thereby forming refracted threedimensional (3D) light landscapes. We investigate numerically and experimentally these 3D landscapes which are customized depending on the droplet shape as well as its refractive index and demonstrate the encoding of droplet information. This approach can also be applied for analyzing droplets showing highspeed dynamics, in order to reveal even minimal shape deviations. The developed technique can be used to complement the existing conventional tools for the investigation of the droplets formed on liquidrepelling surfaces. 12:15pm  12:30pm
ID: 210 / TOM12 S01: 3 TOM 12 Optofluidics Design of an allliquid anamorphic imaging device University of Freiburg, Germany The design of a novel anamorphic optofluidic imaging system based on a pair of liquid lenses whose toroidal surfaces create different optical powers in the symmetryaxes is presented. Using electrowettingondieletrics for actuation, a cylindrical fluidic system is actuated by 32 azimuthallydistributed electrodes allowing the definition of nonrotationallysymmetric surface shapes. We present the design and simulation of this optical system and show that an anamorphic ratio of 1.43 at a maximum field of view of 6.82° is attainable. 12:30pm  12:45pm
ID: 332 / TOM12 S01: 4 TOM 12 Optofluidics Analysis of size and concentration of microplastics in water using static light scattering combined with PCA and LDA ^{1}Vrije Universiteit Brussel, Department of Applied Physics and Photonics, Brussel Photonics, Pleinlaan 2, 1050 Brussels, Belgium; ^{2}CNRIstituto di Fisica Applicata "Nello Carrara", Via Madonna del Piano 10  50019, Sesto Fiorentino (FI) Italy; ^{3}Vrije Universiteit Brussel and Flanders Make, Department of Applied Physics and Photonics, Brussel Photonics, Pleinlaan 2, 1050 Brussels, Belgium Quantitative analysis of size and concentration of microplastics is a crucial step for having a better understanding of plastic pollution in the environment. Such information is typically obtained in a single particle mode that significantly increases the analysis time and can be a cumbersome task. Therefore, we demonstrate here a measurement technique based on Static Light Scattering (SLS) combined with chemometric methods such as Principal Component Analysis (PCA) and Linear Discriminant Analysis (LDA) for resolving the size and concentration of multiple microplastic particles in water. Two sets of samples with uniform and nonuniform size distribution of microplastics, called “monodisperse” and “polydisperse”, respectively, are fully investigated. It is shown that a relationship exists between the scattering signals of mono and polydisperse samples on the PCA space. Hence, a PCALDA model that is constructed on the PCA space of monodisperse samples is used to discriminate the size of the microplastics in polydisperse samples. By specifying the size of the particles, their concentration is determined using a simple linear fit. 12:45pm  1:00pm
ID: 296 / TOM12 S01: 5 TOM 12 Optofluidics Deformation and shapping of optically trapped microdroplets: an abinitio numerical study. ^{1}Commissariat à l’Energie Atomique et aux Energies Alternatives, Centre d’Etudes Scientifiques et Techniques d’Aquitaine, F33116 Le Barp, France.; ^{2}Université de Bordeaux, CNRS, LOMA, UMR 5798, F33405 Talence, France We numerically study the deformation of optically trapped microdroplets with optical tweezers using a housemade code based on the boundary elements method. Particular attention is paid to the droplets deformations itself and on the coupling between the electromagnetic waves forming the trap and the resulting droplets morphologies. 
2:30pm  4:00pm  TOM12 S02: Optofluidics: Emerging Concepts Location: B328 Session Chair: Paulo Marques, University of Porto & INESCTEC, Portugal 

2:30pm  3:00pm
Invited ID: 159 / TOM12 S02: 1 TOM 12 Optofluidics Heliconical Cholesterics: new opportunities for optofluidics? ISASI  CNR  Italy, Italy In this presentation the novelty represented by the heliconical cholesteric liquid crystals (ChOH) for easy electric and optical control of optical properties are highlighted. After a quick summary of their electrooptical properties, an account of the recent experimental and theoretical achievements about the nonlinear optical response of ChOH will be given. The peculiar conical structure allows an easy control of the spectral location of the Bragg resonance making possible effects never observed previously in pure liquid crystals, making these materials attractive for development of several optical devices. 3:00pm  3:15pm
ID: 333 / TOM12 S02: 2 TOM 12 Optofluidics Trapping, characterization and reactions of biocolloids in a salinity gradient Technical University of Denmark, Denmark The properties of soft matter nanoparticles like exosomes are interesting for drug delivery and diagnostics applications. However, the simultaneous characterization of multiple properties, e.g., size and zeta potential, can only be done serially and is highly sensitive to the purification prior to characterization. Here we show how a salt gradient established in a nanofluidic channel induces opposing transport of particles and liquid that trap the particles. Particles are thus accumulated in the trap. We show how optical microscopy images of the particle positions in the salinity gradient provide a measurement of the size and surface charge. We demonstrate the method on a sample of exosomes and on individual particles. Finally, we show how biomolecular reactions at the surface of the nanoparticle can be detected from the optical microscopy analysis of the particles’ trapping position 3:15pm  3:30pm
ID: 326 / TOM12 S02: 3 TOM 12 Optofluidics Sizebased chromosome separation in a microfluidic particle separation device using viscoelastic fluids ^{1}Technical University of Denmark (DTU), Denmark; ^{2}University of Copenhagen (KU), Denmark Viscoelastic flowbased particle manipulation techniques enable bioparticle focusing, separation, and enrichment by precisely tuning the rheological parameters, flow conditions, and microchannel geometry. In this study, we fabricated a PDMSbased single inlet/outlet microchannel to separate bioparticles by their size ranging from 110 µm. Flow conditions and rheological properties are optimized using 2 µm and 4 µm Polystyrene beads to reach the best particle separation condition. We demonstrated the sizebased separation of human chromosomes by separating 12 µm size small chromosomes from 810 µm size large chromosomes. Thanks to its miniaturized size and simplicity, the isolation chip and unique viscoelastic separation method have great potential to be used as a future pioneering tool for genetic applications to study chromosome abnormalities such as fragileX and trisomy. 
 
9:00am  10:30am  TOM8 S01: Nonlinear and Quantum Optics 1 Location: B328 Session Chair: Said Rodriguez, AMOLF, Netherlands, The 

9:00am  9:30am
Invited ID: 361 / TOM8 S01: 1 TOM 8 Nonlinear and Quantum Optics Engineering localised modes via drive and dissipation in photonic lattices Laboratoire de Physique des Lasers, Atomes et Molécules, University of Lille  CNRS, France The engineering of localised modes in photonic structures is one of the main targets of modern photonics. An efficient strategy to design these modes is to use the interplay of constructive and destructive interference in periodic photonic lattices. This mechanism is at the origin of defect modes in photonic bandgaps, bound states in the continuum and compact localised states in flat bands. In this presentation we show that in lattices of lossy resonators, the addition of external optical drives with controlled phase enlarges the possibilities of manipulating interference effects and allows designing novel types of localised modes [1]. We show that light can be localised down to a single site of a photonic lattice in a fully reconfigurable manner. We use the technique to engineer dissipative solitons in topological gaps [2] 9:30am  9:45am
ID: 119 / TOM8 S01: 2 TOM 8 Nonlinear and Quantum Optics Pulse selfcompression down to the subcycle regime in hollow capillary fibers with decreasing pressure gradients Universidad de Salamanca, Spain We theoretically demonstrate an enhancement in the generation of clean, nearinfrared subcycle laser pulses by soliton selfcompression in gasfilled hollow capillary fibers using decreasing pressure gradients. Furthermore, we identify the optimal input parameters for high quality compression and the main advantages of this promising technique which paves the way towards ultrafast vacuum experiments. 9:45am  10:00am
ID: 169 / TOM8 S01: 3 TOM 8 Nonlinear and Quantum Optics Supercontinuum generation in the enhanced frequency chirp regime in multipass cells ^{1}Aplicaciones del Láser y Fotónica, Universidad de Salamanca, Salamanca, Spain; ^{2}JILA and STROBE NSF Science & Technology Center, University of Colorado and NIST, Boulder, Colorado, United States We identify, via numerical simulations, the regime of enhanced frequency chirp during nonlinear propagation in multipass cell. This regime  used before the dawn of chirped pulse amplification to generate ultrashort pulses  paves the way for the generation of temporally clean fewcycle pulses. Here, we demonstrate numerically that the spectra of pulses from an Ybbased laser system can be broadened into a flat supercontinuum with a smooth spectral phase compatible with a clean fewcycle pulse with temporal secondary structures with peak intensity below 0.5% that of the main peak. 10:00am  10:30am
Invited ID: 403 / TOM8 S01: 4 TOM 8 Nonlinear and Quantum Optics Photonphoton interactions using a single quantum emitter in a photonic waveguide CNRS, France Tba 
2:30pm  4:00pm  TOM8 S02: Nonlinear and Quantum Optics 2 Location: B328 Session Chair: Sile Nic Chormaic, OIST Graduate University, Japan 

2:30pm  3:00pm
Invited ID: 162 / TOM8 S02: 1 TOM 8 Nonlinear and Quantum Optics Superfluid light through dissipation ^{1}AMOLF, Amsterdam, the Netherlands; ^{2}Universiteit Antwerpen, Antwerp, Belgium Light in a nonlinear cavity is expected to flow without friction  like a superfluid  under certain conditions. Until now, partlight partmatter (i.e., polariton) superfluids have been observed either at liquid helium temperatures in steady state, or at room temperature for subpicosecond timescales. Here we report superfluid cavity photons (not polaritons) for the first time. When launching a photon fluid against a defect, we observe a suppression of backscattering above a critical density and below a critical velocity. Roomtemperature and steadystate photon superfluidity emerges thanks to the strong thermooptical nonlinearity of our oilfilled cavity. Surprisingly, dissipationless superfluid flow is achieved by absorptive dissipation inducing the thermal nonlinearity. We also show how the thermal relaxation of the oil sets the timescale at which superfluidity emerges. Our experimental observations are reproduced qualitatively by numerical calculations based on a generalized GrossPitaevskii equation for photons coupled to a thermal field. The interpretation of superfluid photons is further substantiated by phase dislocations appearing in the wake of a defect at the breakdown of superfluidity. Our results establish thermooptical nonlinear cavities as platforms for probing photon superfluidity at room temperature, and offer perspectives for exploring superfluidity in arbitrary potential landscapes using structured mirrors. 3:00pm  3:30pm
Invited ID: 115 / TOM8 S02: 2 TOM 8 Nonlinear and Quantum Optics Quantum vacuum excitation of a quasinormal mode in an analog model of black hole spacetime CNRS, France Vacuum quantum fluctuations near horizons are known to yield correlated emission by the Hawking effect. In this talk, I will explain how a 1 dimensional flow of microcavity polaritons may be engineered to produce an effective curved spacetime with a black hole horizon. I will present numerical computations of correlated emission on this spacetime and show that, in addition to the Hawking effect at the sonic horizon, quantum fluctuations may result in a sizeable stationary excitation of a quasinormal mode of the field theory. Observable signatures of the excitation of the quasinormal mode are found in the spatial density fluctuations as well as in the spectrum of Hawking emission. I will explain how the drivendissipative dynamics of the polariton fluid are key to observing the quantum excitation of the quasinormal mode. Nonetheless, this observation suggests a general and intrinsic fluctuationdriven mechanism leading to the quantum excitation of quasinormal modes on black hole spacetimes. 3:30pm  3:45pm
ID: 116 / TOM8 S02: 3 TOM 8 Nonlinear and Quantum Optics Paraxial quantum fluids light in hot atomic vapors LKB, France Hot atomic vapors are widely used in nonlinear and quantum optics due to their large Kerr nonlinearity. This nonlinearity induces effective photonphoton interactions allowing light to behave as a fluid displaying quantum properties such as superfluidity. In this presentation, I will show that we have full control over the Hamiltonian that drives the system and that we can engineer an analogue simulator with light. 3:45pm  4:00pm
ID: 394 / TOM8 S02: 4 Post Deadline submission Photonic Maxwell's demon: feedforward methods for photonic thermodynamic tasks Laboratoire Kastler Brossel, CNRS, France Maxwell's Demon is at the heart of the interrelation between quantum information processing and thermodynamics. In this thought experiment, a demon extracts work from two thermal baths at equilibrium by gaining information about them at the singleparticle level and applying classical feedforward operations. In this talk I will show how to implement a photonic version of Maxwell's Demon with active feedforward in a fiberbased system using ultrafast optical switches. This is the first realisation of an active Demon. The experiment shows that, if correlations exist between the two thermal baths, the Demon can extract over an order of magnitude more work than without correlations. This demonstrates the great potential of photonic experiments  which provide a unique degree of control on the system  to access new regimes in quantum thermodynamics. 
4:30pm  6:00pm  TOM8 S03: Nonlinear and Quantum Optics 3 Location: B328 Session Chair: Kamel Bencheikh, Centre of Nanoscience and Nanotechnology, C2NCNRS, France 

4:30pm  5:00pm
Invited ID: 397 / TOM8 S03: 1 TOM 8 Nonlinear and Quantum Optics Quantum networks and computations with spins in diamond. QuTech, Netherlands, The Electronnuclear spin systems based on optically active defects in diamond provide a promising platform for distributed quantum simulations and computation. In this approach, optically active defect spins are used to form multiqubit processors that can be linked together in a network through photonic links [1,2]. Quantum error correction and computations are then distributed over the network. In this talk I will introduce such spinbased distributed quantum computations and present our recent progress. In particular, we have recently shown that it is possible to control large numbers of nuclear spins around a single NV center [1], and to use these qubits for quantum simulations of manybody physics [3] and for encoding faulttolerant logical qubits [4]. References [1] C. E. Bradley et al., Phys. Rev. X. 9, 031045 (2019) [2] M. Pompili et al., Science 372, 259 (2021) [3] J. Randall et al., Science 374, 1474 (2021) [4] M. H. Abobeih et al. Nature 606, 884 (2021) 5:00pm  5:15pm
ID: 293 / TOM8 S03: 2 TOM 8 Nonlinear and Quantum Optics Widefield broadband CARS microscopy ^{1}Department of Physics, Politecnico di Milano, P.zza Leonardo da Vinci 32, 20133 Milan, Italy; ^{2}CNR Institute for photonics and nanotechnologies (IFN), P.zza Leonardo da Vinci 32, 20133 Milan, Italy Coherent antiStokes Raman scattering is an extremely powerful nonlinear optical (NLO) microscopy technique for labelfree vibrational imaging allowing for a detailed study of biological samples in their native state. To overcome the long acquisition times associated with raster sample scanning required in NLO microscopy, which impair realtime investigation of fast biological dynamics, we employ here widefield signal generation over a large field of view, covering tens of micrometers. To this aim, we exploit an innovative approach based on the use of an amplified femtosecond ytterbium laser source delivering high energy (≈μJ) pulses in the near infrared. This enables the generation of stable broadband Stokes pulses to measure the entire fingerprint region of the molecular vibrational spectrum, the richest in chemical information. Our results pave the way for future translational applications and clinical diagnostics with videorate imaging capabilities. 5:15pm  5:30pm
ID: 149 / TOM8 S03: 3 TOM 8 Nonlinear and Quantum Optics Demonstration of propagationinvariant 3D spacetime wave packets ^{1}University of Central Florida, United States of America; ^{2}Clemson University, United States of America; ^{3}University of Glasgow, United Kingdom; ^{4}Aix Marseille University, France; ^{5}University of Rochester, United States of America We present the first demonstration of propagationinvariant spacetime (ST) wave packets localized in all dimensions. By introducing orbitalangularmomentum into the wave packets, we produce propagationinvariant STOAM wave packets traveling at arbitrary group velocities. 5:30pm  6:00pm
Invited ID: 196 / TOM8 S03: 4 TOM 8 Nonlinear and Quantum Optics Nonlocality and single object spectroscopy in THz Landau polaritons ^{1}Insititute for Quantum Electronics, ETH Zürich, Switzerland; ^{2}Department of Physics and Astronomy, Univ. of Southampton, UK We will discuss, theoretically and experimentally, the existence of a limit to the possibility of arbitrarily increasing electromagnetic confinement in polaritonic systems. Strongly subwavelength fields can excite a continuum of highmomenta propagative magnetoplasmons. This leads to peculiar nonlocal polaritonic effects, as certain polaritonic features disappear and the system enters in the regime of discretetocontinuum strong coupling. We will as well discuss experiments reporting spectroscopy of a single, ultrastrongly coupled, highly subwavelength resonator operating at 300 GHz. 
 
8:30am  10:00am  TOM8 S04: Nonlinear and Quantum Optics 4 Location: B328 Session Chair: Hanna Le Jeannic, CNRS, France 

8:30am  9:00am
Invited ID: 363 / TOM8 S04: 1 TOM 8 Nonlinear and Quantum Optics Quantum imaging with entangled photons School of Physics and Astronomy, University of Glasgow, United Kingdom Tba 9:00am  9:30am
Invited ID: 362 / TOM8 S04: 2 TOM 8 Nonlinear and Quantum Optics Quantum technologies with single molecules and photons CNRINO, Italy This presentation will be presented by Maja Collautti. The generation and manipulation of quantum states of light is required for key applications, such as photonic quantum simulation, linear optical quantum com puting, quantum communication proto cols, and quantum metrology. In this con text, single organic molecules in the family of polycyclic aromatic hydrocar bons (PAH), once embedded in suitable host matrices, offer competitive proper ties and key advantages. Being very small and with welldefined transition dipole moments, they can be used as nanoscopic sensors of e.g. pressure, strain, temperature, electric and magnet ic fields, as well as optical fields. Fur thermore, PAH molecules can be easily fabricated and exhibit strong zero phonon lines, which reach their Fourier limited natural linewidth at liquid helium temperature, thus providing very bright and stable sources of coherent photons in the solid state. 9:30am  9:45am
ID: 266 / TOM8 S04: 3 TOM 8 Nonlinear and Quantum Optics Single atom photon pair source Department of Physics, Humboldt Universität zu Berlin, Germany Sources of entangled photon pairs are a crucial ingredient for many applications in quantum information and communication. Of particular interest are narrowband sources with bandwidths that are compatible with solid state systems such as atomic media for storage and manipulation of the photons. Here, we experimentally realize a source of energytime entangled photon pairs where the photons pairs are generated by scattering light from a single twolevel atom and separated from the coherently scattered light via a narrowband filter. We verify the performance of our pairsource by measuring the second order correlation function of the atomic fluorescence and we observe that one can continuously tune the photon statistics of the atomic fluorescence from perfect photon antibunching to strong photon bunching expected for a photon pair source. Our experiment demonstrates a novel way to realize a photon pair source for photons with spectral bandwidths and resonance frequencies that are inherently compatible with atomic media. 9:45am  10:00am
ID: 200 / TOM8 S04: 4 TOM 8 Nonlinear and Quantum Optics Fourierlimited attosecond pulse generation with magnetically pumped highorder harmonic generation Universidad de Salamanca, Spain After more than two decades of attosecond physics, the generation and control of the shortest laser pulses available remains as a complex task. One of the main limitations of reducing the temporal duration of attosecond pulses emitted from highorder harmonic generation (HHG) is the attochirp. In this contribution, we demonstrate that HHG assisted by strong fast oscillating magnetic fields enables the generation of Fourierlimited attosecond pulses in the water window. In short, the magnetic field generates a nanowirelike structure, which transversally confines the electronic wavefunction in the HHG process. We demonstrate that the resulting HHG spectrum extends well beyond the semiclassical cutoff frequency, and most interestingly, it is emitted in the form of fewcycle, Fourierlimited, attosecond pulses. 