期刊
APPLIED PHYSICS LETTERS
卷 99, 期 21, 页码 -出版社
AMER INST PHYSICS
DOI: 10.1063/1.3664110
关键词
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资金
- NSFC [11004034, 61008029, 51102049]
- Shanghai Pujiang Program [11PJ1400900]
- Program for New Century Excellent Talents in University [NCET-10-0345]
- 973 Program [2007CB613200, 2006CB921700]
Based on the Mie scattering theory, we study optical resonances with whispering gallery modes (WGMs) in tubular microcavities. Rigorous formulas are present to obtain resonant wavelengths and Q factors for the WGM resonances. It is found that the Q factors of microtubes can be dramatically increased by increasing the dielectric constants in tube walls. For common SiO/SiO2 based microtubes, Q factors can be improved by one order when the microtubes are coated with thin high-index HfO2 layers (n = 1.95, thickness = 10 nm). The results could be useful for designing better optical devices based on tubular microcavities. VC 2011 American Institute of Physics. [doi:10.1063/1.3664110]
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