Design of High-Q-Gradient Dielectric Nanoparticle Chain Surface Plasmonic Cavities

Author:

Liu Jing123,Peng Xuanran124,Kang Yaru125,Mao Xu14,Yan Wei14,Zhao Yongmei134,Liu Kong26ORCID,Yang Fuhua124789,Li Zhaofeng1245ORCID

Affiliation:

1. Engineering Research Center for Semiconductor Integrated Technology, Institute of Semiconductors, Chinese Academy of Sciences, Beijing 100083, China

2. Center of Materials Science and Optoelectronics Engineering, University of Chinese Academy of Sciences, Beijing 100049, China

3. School of Electronic, Electrical and Communication Engineering, University of Chinese Academy of Sciences, Beijing 100049, China

4. College of Materials Science and Opto-Electronics Technology, University of Chinese Academy of Sciences, Beijing 100049, China

5. School of Integrated Circuits, University of Chinese Academy of Sciences, Beijing 100049, China

6. Key Laboratory of Semiconductor Materials Science, Beijing Key Laboratory of Low Dimensional Semiconductor Materials and Devices, Institute of Semiconductors, Chinese Academy of Sciences, Beijing 100083, China

7. State Key Laboratory of Superlattices and Microstructures, Institute of Semiconductors, Chinese Academy of Sciences, Beijing 100083, China

8. Beijing Academy of Quantum Information Sciences, Beijing 100193, China

9. Beijing Engineering Research Center of Semiconductor Micro-Nano Integrated Technology, Beijing 100083, China

Abstract

Surface plasmonic cavities consisting of dielectric nanoparticle chains directly placed on a metal substrate are designed and studied, including a periodic nanoparticle chain (PNC) cavity and several different surface plasmon trap (SPT) cavities. The SPT cavities are designed by adjusting the nanoparticle sizes and the spacing between nanoparticles. Among them, the nanoparticle sizes range from 10 nm to 140 nm, and the spacings between the nanoparticles range from 200 nm to 280 nm. Compared to the PNC cavity, the SPT cavities support a single mode operation with higher Q factors within a relatively wide bandwidth. In particular, when the particle size and the spacing between the particles of the chain are set to vary in a parabolic gradient profile, the Q factor of the SPT cavity can be improved up to 85% compared to the PNC cavity. Our designs can be applied in the development of high-Q-factor plasmonic nanolasers.

Funder

National Key R&D Program of China

National Natural Science Foundation of China

Publisher

MDPI AG

Subject

Radiology, Nuclear Medicine and imaging,Instrumentation,Atomic and Molecular Physics, and Optics

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