Evanescent-Depth-Engineered High-Q topological Cavities for Strong Photon-Exciton Coupling
Abstract
Due to the inherent scattering in topological edge states, the topological resonant cavity (TRC) formed by their interference exhibits a relatively low quality factor (Q). To address this issue, we propose the mechanism of engineering the transverse evanescent depth of edge states to achieve high-Q in irregular shaped TRCs, which further enables strong photon-exciton coupling at the single-quantum level. By adjusting the intra- and inter-cell coupling strengths in the pseudo-spin topological photonic crystal, the transverse evanescent depth of edge states is greatly reduced, thereby suppressing the scattering of TRCs. Consequently, the Q of various shaped TRCs with 2 ~ 3 um size is up to 10^5 ~ 10^6 in the visible, so that the strong photon-exciton coupling is achieved. The high-Q topological cavities hold promising application in integrated lasers, sensors, cavity quantum electrodynamics, and quantum photonics.
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BibTeX
@misc{mo2026evanescentdepthengineered,
title = {{Evanescent-Depth-Engineered High-Q topological Cavities for Strong Photon-Exciton Coupling}},
author = {Zihan Mo and Renxuan Peng and Haoyang Zhang and Yu Tian and Ying Gu},
howpublished = {arXiv},
year = {2026},
month = nov,
doi = {10.48550/arxiv.2611.06351},
eprint = {2611.06351},
archivePrefix = {arXiv},
url = {https://arxiv.org/abs/2611.06351},
}
RIS
TY - UNPB
TI - Evanescent-Depth-Engineered High-Q topological Cavities for Strong Photon-Exciton Coupling
AU - Zihan Mo
AU - Renxuan Peng
AU - Haoyang Zhang
AU - Yu Tian
AU - Ying Gu
PY - 2026
DA - 2026/11/04
PB - arXiv
DO - 10.48550/arxiv.2611.06351
UR - https://arxiv.org/abs/2611.06351
AB - Due to the inherent scattering in topological edge states, the topological resonant cavity (TRC) formed by their interference exhibits a relatively low quality factor (Q). To address this issue, we propose the mechanism of engineering the transverse evanescent depth of edge states to achieve high-Q in irregular shaped TRCs, which further enables strong photon-exciton coupling at the single-quantum level. By adjusting the intra- and inter-cell coupling strengths in the pseudo-spin topological photonic crystal, the transverse evanescent depth of edge states is greatly reduced, thereby suppressing the scattering of TRCs. Consequently, the Q of various shaped TRCs with 2 ~ 3 um size is up to 10^5 ~ 10^6 in the visible, so that the strong photon-exciton coupling is achieved. The high-Q topological cavities hold promising application in integrated lasers, sensors, cavity quantum electrodynamics, and quantum photonics.
ER -