[Optics Seminars OIST] by Prof Hentschel

Title: From 2D and 3D billiards for light to mesoscopic optics

Speaker: Prof. Dr. Martina Hentschel
Theoretical Physics of Complex Dynamic Systems, Technische Universität Chemnitz, Germany

Abstract:
The investigation of the propagation of light in mesoscopic, i.e. often micrometer-scale, systems is a rich subject providing insights ranging from quantum chaos in open systems to new schemes for realizing microlasers. The concept of quantum-classical, here wave-ray, correspondence, proves to be a useful tool in many contexts. The confinement of light in optical microresonators is due to total internal reflection, leading to billiards for light. We illustrate the consequences of a chaotic light dynamics and discuss their impact on the far-field emission characteristics of individual optical microcavities with and without internal sources, and for cavity arrays.

The propagation of electromagnetic waves in three-dimensional optical microcavities requires to pay attention to the evolution of the light's polarization as a new degree of freedom. In systems like dielectric Möbius-strips or cone-shaped microtube cavities, the polarization state of resonant whispering gallery-type modes may differ strongly from the reference case of homogeneous cylinders. Whereas we find that the polarization of the electromagnetic field follows the wall orientation in thin Möbius strips, thereby reflecting the accumulated geometric phase, we observe that the electromagnetic field ignores the Möbius topology when the strip thickness is increased. Breaking of symmetries further influences the morphology of resonances and can induce a transition from linear to elliptical polarization that is both of theoretical interest from the point of view of spin-orbit interaction of light and their interpretation in terms of Berry phases, and relevant for potential applications. Spin-orbit coupling of light can be observed in cone-like systems.

Meeting URL:     https://oist.zoom.us/j/95073420177?pwd=SGNXdUpRYW41dVdvVzk2c2cxUUwwZz09&from=addon

Meeting ID:     950 7342 0177
Passcode:    058699