Journal
OPTICS EXPRESS
Volume 25, Issue 2, Pages 615-621Publisher
OPTICAL SOC AMER
DOI: 10.1364/OE.25.000615
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Funding
- National Natural Science Foundation of China (NSFC) [61675126, 61377081, 61007035, 61635006]
- Shanghai Municipal Education Commission
- Shanghai Education Development Foundation [12CG48]
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In this paper, we demonstrate a cone-shaped inwall coupler for excitation of the whispering-gallery modes (WGMs) of a microsphere resonator. The coupler is composed of a single mode fiber (SMF) and a capillary with an inner diameter of 5 mu m. After immersing the capillary front end vertically into Hydrofluoric acid to obtain a cone inside the capillary, light in the SMF couples into the capillary efficiently while the hollow core is wide enough for a microsphere to be inserted. Because the front end face of the capillary acts as a reflector, a Fano resonance with an asymmetric line shape and a Q-factor of 2.57 x 10(4) is observed in the reflection spectrum using a barium titanite glass microsphere with a diameter of 45 mu m. The integrated resonator structure has the advantages such as the reflective type, alignment-free and mechanically robust, making it have great potential in sensing applications and optical switching. (C) 2017 Optical Society of America
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