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arXiv · 2302.04431

Directional emission of nanoscale chiral sources modified by gap plasmons

Hai Lin·Te Wen·Jinglin Tang·Lulu Ye·Guanyu Zhang·Weidong Zhang·Ying Gu·Qihuang Gong·Guowei Lu
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Abstract

Efficient manipulation of the emission direction of a chiral nanoscale light source is significant for information transmission and on-chip information processing. Here, we propose a scheme to control the directionality of nanoscale chiral light sources based on gap plasmons. The gap plasmon mode formed by a gold nanorod and a silver nanowire realizes the highly directional emission of chiral light sources. Based on the optical spin-locked light propagation, the hybrid structure enables the directional coupling of chiral emission to achieve a contrast ratio of 99.5%. The emission direction can be manipulated by tailoring the configuration of the structure, such as the positions, aspect ratios, and orientation of the nanorod. Besides, a great local field enhancement exists for highly enhanced emission rates within the nanogap. This chiral nanoscale light source manipulation scheme provides a way for chiral valleytronics and integrated photonics.

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Hai Lin, Te Wen, Jinglin Tang, Lulu Ye, Guanyu Zhang, Weidong Zhang, Ying Gu, Qihuang Gong, Guowei Lu. 2023-02-09. Directional emission of nanoscale chiral sources modified by gap plasmons. https://doi.org/10.1088/1361-6528/acc2c8

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