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

Year: 2026

Type: preprint

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.

Source: arXiv (Cornell University)

DOI: 10.48550/arxiv.2610.29972

Authors: Hwang, Jonggeun, Park, Kijeong, Lee, Hyeongwoo, Koo, Yeonjeong, Yoo, SeokJae, Ju, Long, Park, Kyoung-Duck

Institutions: Pohang University of Science and Technology, Massachusetts Institute of Technology, Harvard University, Inha University

Language: English

Topic: Plasmonic and Surface Plasmon Research

Subfield: Atomic and Molecular Physics, and Optics

Field: Physics and Astronomy

Domain: Physical Sciences

Open Access status: green

Funders: National Research Foundation of Korea, Iran Telecommunication Research Center, Ministry of Science and ICT, South Korea, Samsung Science and Technology Foundation, Institute for Information and Communications Technology Promotion

OpenAlex ID: W7223241421