Directional emission of nanoscale chiral sources modified by gap plasmons

H Lin, T Wen, J Tang, L Ye, G Zhang, W Zhang… - …, 2023 - iopscience.iop.org
H Lin, T Wen, J Tang, L Ye, G Zhang, W Zhang, Y Gu, Q Gong, G Lu
Nanotechnology, 2023iopscience.iop.org
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 …
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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