Abstract

In the presence of loss and gain, the coupled mode equation on describing the mode hybridization of various waveguides or cavities, or cavities coupled to waveguides becomes intrinsically non-Hermitian. In such non-Hermitian waveguides, the standard coupled mode theory fails. The speaker and his group generalize the coupled mode theory with a properly defined inner product based on reaction conservation. They apply their theory to the non-Hermitian parity-time symmetric waveguides, and obtain excellent agreement with results obtained by finite element full wave simulations. Such treatment can be used to other non-Hermitian problem, such as in chiral and bianisotropic medium.

About the speaker

Prof Yuntian Chen obtained his Bachelor’s degree in Tianjin University in 2005, his MSc degree in Photonics in Zhejiang University and the Royal Institute of Technology (KTH, Sweden) in 2007 and his PhD degree in Technical University of Denmark (DTU) in 2010. Shortly after graduation, he was a Postdoctoral Fellow in the group of Prof Jesper Mørk at DTU and working on the project “Plasmon based light-emitting diode”. He is currently an Associate Professor in the Huazhong University of Science and Technology.

The seminar is free and open to all. Seating is on a first-come, first-served basis.

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