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Modified transmission spectrum induced by two-mode interference in a single silica microsphere

2009; IOP Publishing; Volume: 42; Issue: 21 Linguagem: Inglês

10.1088/0953-4075/42/21/215401

1361-6455

Chun‐Hua Dong, Chang‐Ling Zou, Yun‐Feng Xiao, Jin‐Ming Cui, Zheng‐Fu Han, Guang‐Can Guo,

Advanced Fiber Laser Technologies

We theoretically and experimentally study the resonant transmission spectrum of light in a fibre taper coupled with a single silica microsphere cavity system, where two whispering-gallery modes (WGMs) are simultaneously excited. By changing the taper position (correspondingly, tuning the resonant frequencies of the two WGMs and modulating their coupling conditions with the fibre taper), a sharp electromagnetically-induced- transparency-like window can be observed in the transmission spectrum. This line shape origins from the taper-mediated interference between two co-existing WGMs in a single microsphere. This measurement result agrees well with the theoretical analysis.