Collective Chiral Response of Achiral Plasmonic Arrays Induced by Truncated Bloch-Floquet Effect
Abstract
Chirality in plasmonic systems is commonly associated with structures differentiated by their handedness. Here, we demonstrate the emergence of collective chirality in structurally achiral periodic hole arrays induced by non-local surface-plasmon interactions. We attribute this effect to the transfer of the optical angular momentum in the system. While an individual sub-wavelength circular aperture is not expected to alter the total angular momentum, the periodic structure results in a coherent coupling of plasmons wavefronts, giving rise to a collective Bloch-Floquet-like response. The edge of the structure accumulates the helical phase that eventually results in a visible spin-dependent shifting of the plasmonic beam. We systematically study the effects of hole-array size, periodicity and the geometry. The observed phenomenon shows an unprecedented robustness and consistency. These results establish periodic plasmonic arrays as a platform for converting localized helicity-dependent responses into collective chirality, providing a route toward controlling chiral plasmonic wavefronts in structurally achiral systems.
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BibTeX
@misc{sahoo2026collective,
title = {{Collective Chiral Response of Achiral Plasmonic Arrays Induced by Truncated Bloch-Floquet Effect}},
author = {Sahil Sahoo and Ahmed Lafeef Ettapuram Naduvilepurayil and Akash Das and Yuri Gorodetski},
howpublished = {arXiv},
year = {2026},
month = nov,
doi = {10.48550/arxiv.2611.11384},
eprint = {2611.11384},
archivePrefix = {arXiv},
url = {https://arxiv.org/abs/2611.11384},
note = {CC BY-NC-ND 4.0},
}
RIS
TY - UNPB
TI - Collective Chiral Response of Achiral Plasmonic Arrays Induced by Truncated Bloch-Floquet Effect
AU - Sahil Sahoo
AU - Ahmed Lafeef Ettapuram Naduvilepurayil
AU - Akash Das
AU - Yuri Gorodetski
PY - 2026
DA - 2026/11/08
PB - arXiv
DO - 10.48550/arxiv.2611.11384
UR - https://arxiv.org/abs/2611.11384
AB - Chirality in plasmonic systems is commonly associated with structures differentiated by their handedness. Here, we demonstrate the emergence of collective chirality in structurally achiral periodic hole arrays induced by non-local surface-plasmon interactions. We attribute this effect to the transfer of the optical angular momentum in the system. While an individual sub-wavelength circular aperture is not expected to alter the total angular momentum, the periodic structure results in a coherent coupling of plasmons wavefronts, giving rise to a collective Bloch-Floquet-like response. The edge of the structure accumulates the helical phase that eventually results in a visible spin-dependent shifting of the plasmonic beam. We systematically study the effects of hole-array size, periodicity and the geometry. The observed phenomenon shows an unprecedented robustness and consistency. These results establish periodic plasmonic arrays as a platform for converting localized helicity-dependent responses into collective chirality, providing a route toward controlling chiral plasmonic wavefronts in structurally achiral systems.
ER -