Bound States-to-Bands in the Continuum in Cylindrical Granular Crystals
Abstract
We theoretically investigate and experimentally demonstrate that genuine bound states in the continuum (BICs) -- polarization-protected BICs -- can be completely localized within finite-size solid resonators. This bound mode is realized in a highly tunable mechanical system made of cylindrical granular crystals, where tunning the contact boundaries enables the in situ transition from the BICs to quasi-BICs in a controllable manner. Since a single-particle resonator can support BICs itself, these bound states can extend to form bound bands within periodic structures composed of such resonators. We experimentally demonstrate the emergence of a quasi-bound (flat) band in a finite chain with broken resonator symmetry, using a laser Doppler vibrometer. Remarkably, we show that all cylindrical resonators within the entire chain exhibit high-Q and dispersionless resonance.
Cite
@article{arxiv.2410.16209,
title = {Bound States-to-Bands in the Continuum in Cylindrical Granular Crystals},
author = {Yeongtae Jang and Seokwoo Kim and Dongwoo Lee and Eunho Kim and Junsuk Rrho},
journal= {arXiv preprint arXiv:2410.16209},
year = {2024}
}