Transverse spin texture in optical non-Hermitian skin modes
Abstract
In structured electromagnetic fields, polarization textures are often closely linked to the spatial variation of the energy flow. However, this familiar picture has been established mainly for lossless and isotropic settings, and concrete examples showing how it is modified in media with gain and loss remain limited. Here, we demonstrate that optical skin modes associated with the non-Hermitian skin effect (NHSE) carry a finite transverse circular-polarization texture and further show that the accompanying in-plane electric-field spin texture deviates from the familiar lossless spin-flow picture. Using exact TE mode solutions, we separate the common exponential skin envelope from the oscillatory component. This decomposition shows that the circular-polarization texture is not generated by the skin envelope itself but by the oscillatory interference component modified by non-Hermiticity. It also reveals a handedness bias and a reshaped spatial relation between circularity and intensity. Finite-element calculations confirm that these features remain robust in loss-biased anisotropic media. These results show that gain and loss provide additional freedom for engineering electric-field spin textures beyond conventional lossless photonic settings.
Versions
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BibTeX
@misc{ichiji2026transverse,
title = {{Transverse spin texture in optical non-Hermitian skin modes}},
author = {Naoki Ichiji and Issei Takeda and Taiki Yoda and Yuto Moritake and Masaya Notomi and Satoshi Ashihara},
howpublished = {arXiv},
year = {2026},
month = jun,
doi = {10.48550/arxiv.2606.02189},
eprint = {2606.02189},
archivePrefix = {arXiv},
url = {https://arxiv.org/abs/2606.02189},
}
RIS
TY - UNPB
TI - Transverse spin texture in optical non-Hermitian skin modes
AU - Naoki Ichiji
AU - Issei Takeda
AU - Taiki Yoda
AU - Yuto Moritake
AU - Masaya Notomi
AU - Satoshi Ashihara
PY - 2026
DA - 2026/06/01
PB - arXiv
DO - 10.48550/arxiv.2606.02189
UR - https://arxiv.org/abs/2606.02189
AB - In structured electromagnetic fields, polarization textures are often closely linked to the spatial variation of the energy flow. However, this familiar picture has been established mainly for lossless and isotropic settings, and concrete examples showing how it is modified in media with gain and loss remain limited. Here, we demonstrate that optical skin modes associated with the non-Hermitian skin effect (NHSE) carry a finite transverse circular-polarization texture and further show that the accompanying in-plane electric-field spin texture deviates from the familiar lossless spin-flow picture. Using exact TE mode solutions, we separate the common exponential skin envelope from the oscillatory component. This decomposition shows that the circular-polarization texture is not generated by the skin envelope itself but by the oscillatory interference component modified by non-Hermiticity. It also reveals a handedness bias and a reshaped spatial relation between circularity and intensity. Finite-element calculations confirm that these features remain robust in loss-biased anisotropic media. These results show that gain and loss provide additional freedom for engineering electric-field spin textures beyond conventional lossless photonic settings.
ER -