In recent years, non-Hermitian degeneracies, also known as exceptional points (EPs), have emerged as a new paradigm for engineering the response of optical systems. Among many different non-conservative photonic configurations, parity-time (PT) symmetric arrangements are of particular interest since they provide an excellent platform to explore the physics of exceptional points. In this talk, I will present some of the work in our group, where the intriguing properties of exceptional points that are arising in judiciously designed parity-time-symmetric systems are utilized to address two of the long standing challenges in the field of integrated photonics: enforcing single mode lasing in intrinsically multimode cavities, and enhancing sensitivity of micro-resonators.
Mercedeh Khajavikhan and Demetrios N. Christodoulides, "Active parity-time symmetric systems (Conference Presentation)," Proc. SPIE 10345, Active Photonic Platforms IX, 1034521 (Presented at SPIE Nanoscience + Engineering: August 10, 2017; Published: 29 September 2017); https://doi.org/10.1117/12.2274679.5593117177001.
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