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Optical microdisk cavities with weak boundary deformation

MAY 22, 2017 | 11:00 AM TO 12:30 PM



The Graduate Center
365 Fifth Avenue


May 22, 2017: 11:00 AM-12:30 PM




Initiative for the Theoretical Sciences and PhD Program in Physics


Seminar will take place in Room 5209. 

Speaker: Jan Wiersig (Magdeburg)

Dielectric optical microcavities are important for a wide range of research areas and applications, such as ultra-low threshold lasers and single-photon sources. Microdisks are prominent examples of such cavities as they support whispering-gallery modes with high Q-factors (long photon lifetimes in the cavity). Breaking the rotational symmetry of a disk by deforming its boundary is useful for applications as well as for fundamental studies on ray-wave correspondence in open systems. In this talk I will discuss microdisks with a weak boundary deformation. First, I will introduce and study the inverse problem of deformed microcavities where the far-field emission pattern is given and the corresponding cavity deformation has to be determined. Second, I will study the reduction of the Q-factor due to the deformation (Q-spoiling) in the context of resonance-assisted tunneling in nearly-integrable quantum systems. Finally, I will present an extension of the perturbation theory for weakly deformed microdisks with mirror reflection symmetry to the general, nonsymmetric case.