Optical resonances in tubular microcavities with subwavelength wall thicknesses
Optical resonances in tubular microcavities with subwavelength wall thicknesses
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DOI：
10.1063/1.3664110
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发表时间：
2011-11
影响因子：
4
通讯作者：
T. Zhan;Chun Xu;F. Zhao;Z. Xiong;Xinhua Hu;Gaoshan Huang;Y. Mei;J. Zi
中科院分区：
文献类型：
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作者：
T. Zhan;Chun Xu;F. Zhao;Z. Xiong;Xinhua Hu;Gaoshan Huang;Y. Mei;J. Zi
基于Mie散射理论，我们研究了管状微腔中具有回音廊模式的光学共振。给出了得到WGM共振的共振波长和Q因子的严格公式。研究发现，增大管壁的介电常数可以显著提高微管的Q值。对于普通的SiO/SiO_2基微管，当微管表面涂覆薄的高折射率HfO2层(n = 为1.95，厚度为 = 10 nm)时，Q值可提高一个数量级。研究结果可用于设计更好的基于管状微腔的光学器件。
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.