Observation of Coherent Perfect Acoustic Absorption at an Exceptional Point
Applied Physics
2025-06-06 v1 Classical Physics
Abstract
Non-Hermitian systems have recently shown new possibilities to manipulate wave scattering by exploiting loss, yet coherent perfect absorption at an exceptional point (CPA EP) remains elusive in acoustics. Here we demonstrate it based on a two-channel waveguide with compact lossy resonators. We realize imbalanced losses crucial for CPA EP by using active components to independently modulate the non-Hermiticity. The CPA EP experimentally manifests as full absorption at a unique real frequency and shows high sensitivity to the incident phase variations.Our findings open an avenue to explore novel non-Hermitian physics for classical waves and develop innovative acoustic singularity-based devices.
Keywords
Cite
@article{arxiv.2506.04231,
title = {Observation of Coherent Perfect Acoustic Absorption at an Exceptional Point},
author = {Yi-Fei Xia and Zi-Xiang Xu and Yu-Ting Yan and An Chen and Jing Yang and Bin Liang and Jian-Chun Cheng and Johan Christensen},
journal= {arXiv preprint arXiv:2506.04231},
year = {2025}
}