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arXiv · 2610.29972

Chiral near-fields at achiral plasmonic tips enable nanoscale valley polarimetry

Jonggeun Hwang·Kijeong Park·Hyeongwoo Lee·Yeonjeong Koo·SeokJae Yoo·Long Ju·Kyoung-Duck Park
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Abstract

Optical helicity is central to chiral light-matter interactions, yet plasmonic confinement typically distorts it at the nanoscale. Here, we demonstrate nanoscale valley polarimetry using an achiral Au tip, where incidence-angle control of circularly polarized light creates a strongly localized, helicity-preserving near-field. Chiral tip-enhanced photoluminescence (c-TEPL) directly resolves and reverses local valley polarization in monolayer WSe2 and reveals nanoscale polarization variations in strained MoS2 hidden by diffraction-limited measurements.

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Jonggeun Hwang, Kijeong Park, Hyeongwoo Lee, Yeonjeong Koo, SeokJae Yoo, Long Ju, Kyoung-Duck Park. 2026-10-21. Chiral near-fields at achiral plasmonic tips enable nanoscale valley polarimetry. https://arxiv.org/abs/2610.29972

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