TOM 1 - Silicon Photonics and Guided-Wave Optics
TOM 2 - Computational, Adaptive and Freeform Optics
TOM 3 - Optical System Design, Tolerancing and Manufacturing
TOM 4 - Bio-Medical Optics
TOM 5 - Resonant Nanophotonics
TOM 6 - Optical Materials: crystals, thin films, organic molecules & polymers, syntheses, characterization and applications
TOM 7 - Thermal radiation and energy management
TOM 8 - Non-linear and Quantum Optics
TOM 9 - Opto-electronic Nanotechnologies and Complex Systems
TOM 10 - Frontiers in Optical Metrology
TOM 11 - Tapered optical fibers, from fundamental to applications
TOM 12 - Optofluidics
TOM 13 - Advances and Applications of Optics and Photonics
EU Project Session
Early Stage Researcher Session
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Please note that all times are shown in the time zone of the conference. The current conference time is: 11th Aug 2022, 09:01:01pm WEST
TOM13 S03: Advances and Applications of Optics and Photonics
4:30pm - 6:00pm
4:30pm - 4:45pm ID: 259 / TOM13 S03: 1 TOM 13 Advances and Applications of Optics and Photonics
Wavelength-switchable L-band fiber laser assisted by ultrafast laser fabricated random reflectors
Rosa Ana Perez-Herrera1,2, Pablo Roldan-Varona3,4,5, Arturo Sanchez-Gonzalez1,2, Luis Rodriguez-Cobo4, Jose Miguel Lopez-Higuera3,4,5, Manuel Lopez-Amo1,2
1Department of Electrical, Electronic and Communication Engineering, Public University of Navarra, 31006 Pamplona, Spain; 2Institute of Smart Cities (ISC), Public University of Navarra, 31006 Pamplona, Spain; 3Photonics Engineering Group, University of Cantabria, 39005 Santander, Spain; 4CIBER-bbn, Instituto de Salud Carlos III, 28029 Madrid, Spain; 5Instituto de Investigacion Sanitaria Valdecilla (IDIVAL), 39005 Cantabria, Spain
A wavelength-switchable L-band erbium-doped fiber laser (EDFL) assisted by an artificially controlled backscattering (ACB) fiber reflector is here presented. This random reflector was inscribed by femtosecond (fs) laser direct writing on the axial axis of a multimode fiber with 50 µm core and 125 µm cladding with a length of 17 mm. This microstructure was placed inside a surgical syringe to be positioned in the center of a high-precision rotation mount to accurately control its angle of rotation. Only by rotating this mount, three different output spectra were obtained: a single wavelength lasing centered at 1574.75 nm, a dual wavelength lasing centered at 1574.75 nm and 1575.75 nm, and a single wavelength lasing centered at 1575.5 nm. All of them showed an optical signal-to-noise ratio (OSNR) of around 60 dB when pumped at 300 mW.
4:45pm - 5:00pm ID: 135 / TOM13 S03: 2 TOM 13 Advances and Applications of Optics and Photonics
Scalar two-beam interference in spatial 2 by 2 unitary transformations
Atri Halder, Andreas Norrman, Jari Turunen, Ari T. Friberg
University of Eastern FInland, Finland
We study the evolution of several important physical quantities associated with scalar two-beam interference under 2 by 2 spatial unitary operations. In particular, we develop a geometrical framework to describe visibility, distinguishability, and concurrence, as well as their mutual connections and complementary features, in such transformations.
5:00pm - 5:15pm ID: 175 / TOM13 S03: 3 TOM 13 Advances and Applications of Optics and Photonics
Detection of 3D coherence Stokes parameters with nanoscatterers
Mengwen Guo1,2, Andreas Norrman2,3, Ari T. Friberg2, Tero Setälä2
1Department of Physics, Hangzhou Dianzi University, Hangzhou 310018, China; 2Institute of Photonics, University of Eastern Finland, P.O. Box 111, FI-80101 Joensuu, Finland; 3Photonics Laboratory, ETH Zurich, CH-8093 Zurich, Switzerland
We present a method to probe the spectral coherence Stokes parameters of a random nonparaxial optical field by using two dipolar nanoscatterers. The method is based on observing the intensity and polarization-state fringes of the interfering scattered fields in the far zone. We show that all nine coherence Stokes parameters at the nanoparticles can be fully determined through measurements in three directions.
5:15pm - 5:30pm ID: 242 / TOM13 S03: 4 TOM 13 Advances and Applications of Optics and Photonics
Extracting complex refractive indices from THz-TDS data with artificial neural networks
Nicholas Thomas Klokkou1, Jon Gorecki2, James Shafto Wilkinson1, Vasilis Apostolopoulos1
1University of Southampton, United Kingdom; 2Queen Mary University of London
Terahertz time-domain spectroscopy (THz-TDS) benefits from high signal-to-noise ratios (SNR), however extraction of material parameters involves a number of steps which can introduce errors into the final result. We present the use of artificial neural networks (ANN) as the first step to achieve a comprehensive approach for the extraction of the complex refractive index from THz-TDS data. The ANN shows performance superior to approximation methods and has a more straightforward implementation than root finding methods. Deep and convolutional neural networks are demonstrated to accept an entire frequency range at once, providing a tool for fitting where SNR is low, producing a more stable result.