speaker: Martina Hentschel (Technische Universität Chemnitz, Germany, host: Penc Karlo)
Title: Mesoscopic optics: from ray-wave correspondence to non-Hermitian photonics
Date: 2024. szeptember 10. kedd, 10.00 óra
Place: 1-es épület, nagy előadóterem
Abstract:
Optical microcavities have proven to be a fruitful mesoscopic model system in the field of quantum chaos. With typical dimensions on the micrometer scale, these dielectric microdisk resonators have diameters of several to several dozens wavelengths, making them perfectly suited to study interference-induced deviations from the ray picture. However, a (surprising) correspondence between ray and wave simulation results as well as experimental measurements - all taking place in different wavelength regimes - was found, and marked a significant point in their understanding and efficient, application oriented modeling. While the confinement of light by total internal reflection, and the corresponding whispering-gallery type resonances with very high quality factors, are the foundation for their use as microlaser [1], they remain intrinsically open and non-Hermitian systems. We illustrate this behavior for a system of two coupled deformed microdisk resonators [2] and show the emerging chirality and the formation of exceptional points. Moreover, we will briefly discuss coupling effects in the far-field emission characteristics of microcavity arrays.
[1] Q. J. Wang et al., New J. Phys. 11, 125018 (2009) and other.
[2] T. Rodemund et al., APL 124, 051107 (2024)
