Planar Chiral Nanoantenna for Excitation-Chirality-Controlled Hot Spot Modulation and Emitter-Coupled Circularly Polarized Emission.

Authors

Abhik Chakraborty, Xiaofei Wu, Ankit Kumar Singh, Fabian Scheidler, Min Jiang, Jürgen Popp, Bert Hecht, Jer-Shing Huang

Published in

Nanophotonics (Berlin, Germany). Volume 15. Issue 14. Pages e70199. Epub Jul 14, 2026.

Abstract

A planar chiral plasmonic nanoantenna exhibiting an excitation-chirality-dependent hot spot in a nanogap is numerically investigated. Additionally, the underlying design principles are examined, providing a broadly applicable framework for engineering chiral nanoantennas through controlled geometrical or modal asymmetry. The hot spot can be turned on and off by changing the handedness of the exciting circularly polarized light (CPL). This effect stems from the rationally designed interference of plasmonic modes excited by the linearly polarized orthogonal components of CPL. The hot spot exhibits maximal near-field dissymmetry factor (≈ -2) at a wavelength of 842 nm. The intensity at the hot spot can also be continuously modulated by varying the excitation ellipticity and handedness, approaching a modulation depth of 100%. These attributes enable chirality- and ellipticity-dependent switching and dynamic modulation of the plasmonic near field. Moreover, placing an achiral quantum emitter in the nanogap generates almost perfectly circularly polarized emission, offering a simple yet effective avenue to realize nanoscale circularly polarized single-photon sources.

PMID:
42845950
Bibliographic data and abstract were imported from PubMed on 08 Oct 2026.

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