Li Jie, Zhu Ming-Jie, Wang Ying-Hua, Jin Ren-Chao, Li Jia-Qi, Dong Zheng-Gao
Physics Department and Key Laboratory of MEMS of the Ministry of Education, Southeast University, Nanjing 211189, China.
Sci Rep. 2017 May 9;7:46609. doi: 10.1038/srep46609.
The far-field radiation of a single dipolar emitter can be controlled by coupling to toroidal dipole resonance attached to metallic double flat rings, realizing a conversion from non- to super-radiating. The underlying physical mechanism is the hybridization interference of toroidal and electric dipoles under an asymmetric configuration by introducing a radial displacement of the dipolar emitter. By embedding gain medium in the gap spacer between double flat rings, the directional far-field super-radiating power can achieve a tremendous enhancement with a moderate requirement on the gain coefficient, promoting light-matter interaction manipulation.
单个偶极发射器的远场辐射可通过与附着在金属双扁平环上的环形偶极共振耦合来控制，实现从非辐射到超辐射的转变。其潜在物理机制是通过引入偶极发射器的径向位移，在不对称配置下环形偶极和电偶极的杂化干涉。通过在双扁平环之间的间隙间隔中嵌入增益介质，定向远场超辐射功率可以在对增益系数要求适中的情况下实现巨大增强，促进光与物质相互作用的操控。
