Chip-integrated all-optical diode based on nonlinear plasmonic nanocavities covered with multicomponent nanocomposite

Nanophotonics

article

Zhen Chai¹  Xiaoyong Hu¹  Hong Yang¹  Qihuang Gong¹ 

[1] State Key Laboratory for Mesoscopic Physics and Department of Physics, Collaborative Innovation Center of Quantum Matter, Peking University;Collaborative Innovation Center of Extreme Optics, Shanxi University

关键词: plasmonic nanocavity;    all-optical diode;    plasmon-induced transparency;    third-order optical nonlinearity;    multicomponent nanocomposite;   

DOI  :  10.1515/nanoph-2016-0127

学科分类：社会科学、人文和艺术（综合）

来源: De Gruyter

【 摘 要 】

Ultracompact chip-integrated all-optical diode is realized experimentally in a plasmonic microstructure, consisting of a plasmonic waveguide side-coupled two asymmetric plasmonic composite nanocavities covered with a multicomponent nanocomposite layer, formed directly in a plasmonic circuit. Extremely large optical nonlinearity enhancement is obtained for the multicomponent nanocomposite cover layer, originating from resonant excitation, slow-light effect, and field enhancement effect. Nonreciprocal transmission was achieved based on the difference in the shift magnitude of the transparency window centers of two asymmetric plasmonic nanocavities induced by the signal light, itself, for the forward and backward propagation cases. An ultralow threshold incident light power of 145 μW (corresponding to a threshold intensity of 570 kW/cm 2 ) is realized, which is reduced by seven orders of magnitude compared with previous reports. An ultrasmall feature size of 2 μm and a transmission contrast ratio of 15 dB are obtained simultaneously.

【 授权许可】

CC BY