Directional emission of nanoscale chiral sources modified by gap plasmons. (11th June 2023)

• Record Type: Journal Article
• Authors: Lin, Hai; Wen, Te; Tang, Jinglin; Ye, Lulu; Zhang, Guanyu; Zhang, Weidong; Gu, Ying; Gong, Qihuang; Lu, Guowei
• Is Part Of: Nanotechnology. Volume 34:Number 24(2023)
• Publication Date: 2023-06-11
• Subjects: gap surface plasmons -- chiral coupling -- nanoscale directional emission; Nanotechnology -- Periodicals; Nanotechnology -- Periodicals; Nanotechnology; Publications périodiques; Nanotechnologies; Periodicals; 620.5
• DOI: 10.1088/1361-6528/acc2c8
• Languages: English
• ISSNs: 0957-4484

Abstract

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.