Optical Amplification with Large Goos-Hänchen Shift Driven by Non-Hermitian Bilayer Meta-Grating Under Lasing State
Abstract
The coexistence of gain and loss in parity-time symmetric bilayer meta-gratings enables the transformation of bound states in the continuum into a ring of lasing threshold modes. Under lasing state, gain saturation drives the contraction of this mode ring into a single discrete lasing point. Additionally incident weak optical field with frequency and incident angle nearly matched to the lasing mode can obtain amplification accompanied by prominent Goos-Hänchen shifts. Specifically, active meta-grating with lasing mode at the Γ point induce sizable Goos-Hänchen shifts. In contrast, active meta-grating with lasing mode off the Γ point induce large Goos-Hänchen shifts that are proportional to the quality factor of the effective resonant modes under lasing state. In finite meta-grating, finite-size effects exert distinct influences on the lasing state as well as the Goos-Hänchen shifts of the additionally incident optical field: the lasing characteristics and Goos-Hänchen shifts of Γ-point lasing modes remain nearly unaffected, whereas those of off-Γ lasing modes are significantly modulated by finite-size perturbations.
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BibTeX
@misc{luo2026optical,
title = {{Optical Amplification with Large Goos-H$\ddota$nchen Shift Driven by Non-Hermitian Bilayer Meta-Grating Under Lasing State}},
author = {Ma Luo and Xueyi Zhang},
howpublished = {arXiv},
year = {2026},
month = oct,
doi = {10.48550/arxiv.2606.31060},
eprint = {2606.31060},
archivePrefix = {arXiv},
url = {https://arxiv.org/abs/2606.31060},
}
RIS
TY - UNPB
TI - Optical Amplification with Large Goos-Hänchen Shift Driven by Non-Hermitian Bilayer Meta-Grating Under Lasing State
AU - Ma Luo
AU - Xueyi Zhang
PY - 2026
DA - 2026/10/10
PB - arXiv
DO - 10.48550/arxiv.2606.31060
UR - https://arxiv.org/abs/2606.31060
AB - The coexistence of gain and loss in parity-time symmetric bilayer meta-gratings enables the transformation of bound states in the continuum into a ring of lasing threshold modes. Under lasing state, gain saturation drives the contraction of this mode ring into a single discrete lasing point. Additionally incident weak optical field with frequency and incident angle nearly matched to the lasing mode can obtain amplification accompanied by prominent Goos-Hänchen shifts. Specifically, active meta-grating with lasing mode at the Γ point induce sizable Goos-Hänchen shifts. In contrast, active meta-grating with lasing mode off the Γ point induce large Goos-Hänchen shifts that are proportional to the quality factor of the effective resonant modes under lasing state. In finite meta-grating, finite-size effects exert distinct influences on the lasing state as well as the Goos-Hänchen shifts of the additionally incident optical field: the lasing characteristics and Goos-Hänchen shifts of Γ-point lasing modes remain nearly unaffected, whereas those of off-Γ lasing modes are significantly modulated by finite-size perturbations.
ER -