Mr. Krishna Joshi Profile

Krishna Joshi

at Tata Institute of Social Sciences

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Proceedings Article | 3 October 2022 Presentation + Paper

Direct observation of lasing over exceptional points in Anderson-localizing systems

K. Joshi, S. Mujumdar

Proceedings Volume 12195, 1219509 (2022) https://doi.org/10.1117/12.2646509

KEYWORDS: Complex systems, Mesoscopic physics, Disordered photonic crystals, Microresonators, Resonators

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Exceptional points (EP) in a non-Hermitian system involve the simultaneous coalescence of two or multiple eigenvalues and associated eigenvectors. Known for their novel functionalities, they have been demonstrated in multiple deterministic systems. Here, we experimentally demonstrate lasing over exceptional points in quasi-one-dimensional Anderson localizing structures with optical gain. Simultaneous spectro-spatial analysis of emission modes revealed coupled lasing modes in several configurations. Systematic analysis of spectral splitting and associated eigenfunctions revealed simultaneous coalescence of eigenvalues and eigenvectors. The former was directly measured in the spectra, while the latter was endorsed by observation of asymmetric amplification in one of the two cavities. The square-Lorentzian lineshape certified Anderson-localized lasing over exceptional points. Enhanced functionality manifested as manyfold increase in lasing intensity at the exceptional point.

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