光电子学
炸薯条
光学
物理
纳米技术
材料科学
电信
计算机科学
作者
Yizhen Chen,Xiaoying Zheng,Xiyue Zhang,Weikang Pan,Zhuo Wang,Shiqing Li,Shaohua Dong,Feifei Liu,Qiong He,Lei Zhou,Shulin Sun
出处
期刊:Nano Letters
[American Chemical Society]
日期:2023-04-07
卷期号:23 (8): 3326-3333
被引量:30
标识
DOI:10.1021/acs.nanolett.3c00310
摘要
On-chip photonic systems play crucial roles in nanoscience and nanoapplications, but coupling external light to these subwavelength devices is challenging due to a large mode mismatch. Here, we establish a new scheme for realizing highly miniaturized couplers for efficiently exciting on-chip photonic devices in a controllable way. Relying on both resonant and Pancharatnam–Berry mechanisms, our meta-device can couple circularly polarized light to a surface plasmon, which is then focused into a spot placed with a target on-chip device. We experimentally demonstrate two meta-couplers. The first can excite an on-chip waveguide (with a 0.1λ × 0.2λ cross section) with an absolute efficiency of 51%, while the second can achieve incident spin-selective excitation of a dual-waveguide system. Background-free excitation of a gap–plasmon nanocavity with the local field enhanced by >1000 times is numerically demonstrated. Such a scheme connects efficiently propagating light in free space and localized fields in on-chip devices, being highly favored in many integration-optics applications.
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