物理
极化(电化学)
散射
光学
光子学
引力奇点
干扰(通信)
位置和动量空间
光子晶体
动量(技术分析)
计算物理学
量子力学
计算机科学
化学
计算机网络
频道(广播)
物理化学
财务
经济
作者
Viet Anh Nguyen,Viet Hoang Le,Eirini Sarelli,Loïc Malgrey,Д. Т. Луу,Ha Linh Chu,Truong Tuan Vu,Cong Quang Tong,Đình Lãm Vũ,Christian Seassal,Quynh Le‐Van,Hai Son Nguyen
摘要
This study explores exceptional points (EPs) in photonic crystals (PhCs) and introduces an experimental technique for their single-shot observation. Exceptional points are spectral singularities found in non-Hermitian systems, such as leaky PhC slabs. However, directly observing EPs in PhC systems using regular reflectivity spectroscopy is a considerable challenge due to interference between guided resonances and background signals. In this work, we present a simple, nondestructive technique that employs crossed polarizations to directly observe EPs in momentum-resolved resonant scattering. This approach effectively suppresses the background signal, enabling exclusive probing of the guided resonances where EPs manifest. Our results demonstrate the formation of EPs in both energy-momentum mapping and isofrequency imaging. All experimental findings align seamlessly with numerical simulations and analytical models. Our approach holds great potential as a robust tool for studying non-Hermitian physics in the PhC platform.
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