Non-Hermitian Systems in Optics and Acoustics (PC: Prof. Jensen LI; Co-PIs: Profs. Che Ting CHAN, Wing Yim TAM) This Collaborative Research Fund project aims to investigate how non-Hermitian physics can be used to manipulate wave propagation in both optical and acoustic systems. Recent explorations of loss and gain within non-Hermitian systems predict important roles for loss and gain in wave propagation due to the appearance of exceptional points. These exceptional points affect the system response in peculiar and sensitive ways, making potential applications of non-Hermitian physics virtually limitless, with some promising applications such as enhanced sensing, laser-mode selection, and unidirectional invisibility. The project explores new geometric structures of exceptional points, metasurfaces equipped with exceptional points, and dynamically tunable non-Hermitian systems to achieve these goals. 22
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