An LR-shunted resonator for observation of an exceptional point and programmable perfect absorption

Xiaopeng Li; Ziqi Yu; Taehwa Lee

doi:10.1117/12.2663292

28 April 2023 An LR-shunted resonator for observation of an exceptional point and programmable perfect absorption

Xiaopeng Li, Ziqi Yu, Taehwa Lee

Author Affiliations +

Proceedings Volume PC12483, Active and Passive Smart Structures and Integrated Systems XVII; PC124830K (2023) https://doi.org/10.1117/12.2663292
Event: SPIE Smart Structures + Nondestructive Evaluation, 2023, Long Beach, California, United States

Abstract

Non-Hermitian systems have brought great attention to researchers on wave manipulation by introducing losses. Here, we introduce an LR-shunted resonator for the observation of an exceptional point (EP) via tuning the shunting resistance. Through theoretical, numerical, and experimental studies, we demonstrate that by changing the circuit parameters, such as inductance and resistance, such a simple design supports the non-Hermitian degeneracy, namely the exceptional point. Moreover, near the EP, the mechanical resonance splitting has a square-root dependence on the resistance variation. We further numerically and experimentally demonstrate programmable perfect flexural wave absorption at the low-frequency range using this LR-shunted resonator. The absorption spectrum could be further enhanced with an additional shunted negative capacitor. Our approach provides alternative solutions for nondestructive structural health monitoring with enhanced sensitivity and perfect wave absorption.

Conference Presentation

Citation Download Citation

Xiaopeng Li, Ziqi Yu, and Taehwa Lee "An LR-shunted resonator for observation of an exceptional point and programmable perfect absorption", Proc. SPIE PC12483, Active and Passive Smart Structures and Integrated Systems XVII, PC124830K (28 April 2023); https://doi.org/10.1117/12.2663292

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