Time: Wednesday, 11/Sept/2024: 2:15pm - 3:45pm Session Chair: Nicolas Bonod, CNRS, France |
Location: A.1.1b |
Invited
ID: 362 / TOM5 S1: 1
TOM 5 Nanophotonics
Invited - Solving Maxwell's equations using polarimetry alone
Universidad de La Laguna (ULL), Tenerife, Canary Islands, Spain.
Maxwell's equations are solved if and only if the amplitude and phase of the total electromagnetic fields are determined across all spatial points. Typically, the Stokes parameters can only capture the field's amplitude and polarization in the (far) radiation zone. Thus, relying solely on the measurement of the Stokes parameters proves insufficient to solve Maxwell's equations.
In this talk, I present a method that successfully solves Maxwell's equations for widely studied objects in Nanophotonics using only the Stokes parameters. This feature endows the Stokes parameters, primarily used to gain insight into the polarization state of electromagnetic radiation, with an even more fundamental role in electromagnetic scattering theory. Consequently, our findings, supported by analytical theory and exact numerical simulations, can find applications in all branches of Nanophotonics and Optics.
ID: 178 / TOM5 S1: 2
TOM 5 Nanophotonics
Design of resonant metasurfaces based on symmetries and phase singularities
1Université Côte d’Azur, CNRS, CRHEA, 06560 Valbonne, France; 2Physics department, Colorado School of Mines, 1523 Illinois St., Golden, CO-80401, USA
We show that certain desired behaviors of optical metasurfaces (e.g large amplitude of the transmission/reflection coefficients, variation of the phase between 0 and 2π) are linked to simple conditions on the positions of phase singularities in the complex-frequency plane. These positions are shown to be linked to certain symmetries of the metasurface. These findings provide a method for designing metasurfaces based on symmetry breaking.
ID: 241 / TOM5 S1: 3
TOM 5 Nanophotonics
Quasi-normal mode perturbation theory to achieve Q-factor optimization of resonances in disordered photonic systems
1University of Florence, Italy; 2University of Surrey; 3Instituto de Ciencia de Materiales de Madrid; 4Swiss Federal Institute of Technology Lausanne
The optimization of the quality factor (Q) of photonic resonators is of great importance for applications exploiting both ordered and disordered systems. Here we propose a gradient-based automated optimization approach to maximize the Q of optical resonances in ordered and disordered dielectric slabs which uses first-order non-hermitian perturbation theory. After benchmarking our method with an L3 photonic crystal cavity, we apply it to optimize a selected Anderson mode in a random design with initial Q-factor of 200, generating a new mode with Q = (10)^5.
ID: 467 / TOM5 S1: 4
TOM 5 Nanophotonics
Derivative-free optimization for optical chirality enhancement
1Università degli studi di Pavia, Italy; 2SAPIENZA Università di Roma, Italy; 3Politecnico di Milano, Italy
We adopt a multi-objective optimization approach to design one-dimensional photonic crystals with large optical chirality enhancements. We show that this technique allows for a large design flexibility in terms of selected materials and operational wavelengths. Finally, we demonstrate that the designed platforms provide state of the art chirality enhancements above the two orders of magnitude over arbitrarily large areas and broad spectral ranges.