Affiliation:
1. State Key Laboratory of Luminescent Materials and Devices School of Materials Science and Engineering South China University of Technology Guangzhou 510640 China
2. School of Physics and Optoelectronics South China University of Technology Guangzhou 510640 China
3. School of Materials Science and Engineering Zhejiang University Hangzhou 310027 China
4. State Key Laboratory of Modern Optical Instrumentation College of Optical Science and Engineering Zhejiang University Hangzhou 310027 China
Abstract
AbstractThe development of novel materials and structures for efficient second‐order nonlinear micro/nano devices remains a significant challenge. In this study, the remarkable enhancement of second‐harmonic generation (SHG) and cascaded sum frequency generation in whispering gallery mode microspheres made of surface‐crystallized glass with a 6‐µm Ba2TiSi2O8 crystal layer are demonstrated. Attributed to the core–shell design, the Ba2TiSi2O8 located on the surface can be efficiently coupled with whispering gallery modes, resulting in a highly efficient micron‐scale cavity‐enhanced second‐order optical nonlinearity. Greatly enhanced SHG of the microcavity is observed, which is up to 80 times stronger than that of a non‐resonant sample. Furthermore, owing to the wavelength non‐selectivity of random quasi‐phase matching, ultra‐wideband SHG with a strong response ranging from 860 to 1600 nm and high‐contrast polarization characteristics is demonstrated. The glass‐ceramic‐based microsphere cavity also boosts the cascading optical nonlinearity, manifested by a two‐magnitude enhancement of cascaded sum frequency generation. This work delineates an efficient strategy for boosting nonlinear optical response in glass ceramics, which will open up new opportunities for applications in photonics and optical communications.
Funder
National Natural Science Foundation of China
Fundamental Research Funds for the Central Universities
Basic and Applied Basic Research Foundation of Guangdong Province
National Postdoctoral Program for Innovative Talents
China Postdoctoral Science Foundation
Cited by
1 articles.
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