A low-loss molybdenum plasmonic waveguide: perfect single-crystal preparation and subwavelength grating optimization
Author:
Cui Tao1, Shen Yan1ORCID, Cheng Ao1, Zhan Runze1, Zheng Zebo1, Tian Bo1, Shi Jia1, Ke Yanlin1, Shao Lei1, Chen Huanjun1ORCID, Deng Shaozhi1
Affiliation:
1. State Key Laboratory of Optoelectronic Materials and Technologies, Guangdong Province Key Laboratory of Display Material and Technology, School of Electronics and Information Technology, Sun Yat-Sen University , Guangzhou 510275 , China
Abstract
Abstract
Plasmonic waveguides have attracted tremendous interest due to efficiently confining photons on the subwavelength spatial scale to be beating the propagation diffraction limit. Transition metal molybdenum (Mo) exhibits outstanding properties in light trapping and electromagnetic field confining, making it potentially valuable in 1.55 μm plasmonic waveguide applications. However, the reliable fabrication of high-quality Mo plasmonic waveguides is a significant challenge. A real-space micro-imaging study of the surface plasmon on Mo structures is still absent. In this study, we successfully prepared a single-crystalline Mo microrod waveguide structure and fabricated subwavelength gratings on it. The diffraction gratings were designed, optimized, and etched to excite the surface plasmon polariton behaviour of Mo for the first time. The grating-optimized Mo microrod single-crystal reveals highly efficient waveguide performance around near-infrared spectroscopy, exhibiting a long propagation length of 32 μm and a low transmission loss of 0.067 dB μm−1. The results provide an alternative to advanced materials research and optical device applications of plasmonic waveguide systems.
Funder
National Key Basic Research Program of China National Natural Science Foundation of China Guangdong Basic and Applied Basic Research Foundation Fundamental Research Funds for the Central Universities, Sun Yat-sen University Science and Technology Department of Guangdong Province, Guangzhou Municipal Science and Technology Bureau
Publisher
Walter de Gruyter GmbH
Subject
Electrical and Electronic Engineering,Atomic and Molecular Physics, and Optics,Electronic, Optical and Magnetic Materials,Biotechnology
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