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Chin. Phys. B, 2017, Vol. 26(5): 054211    DOI: 10.1088/1674-1056/26/5/054211
ELECTROMAGNETISM, OPTICS, ACOUSTICS, HEAT TRANSFER, CLASSICAL MECHANICS, AND FLUID DYNAMICS Prev   Next  

Silica-based microcavity fabricated by wet etching

H Long(龙浩), W Yang(杨文), L Y Ying(应磊莹), B P Zhang(张保平)
Department of Electronic Engineering, Optoelectronics Engineering Research Center, Xiamen University, Xiamen 361005, China
Abstract  

Silica whispering gallery mode (WGM) microcavities were fabricated by the buffered oxide etcher and potassium hydroxide wet etching technique without any subsequent chemical or laser treatments. The silicon pedestal underneath was an octagonal pyramid, thus providing a pointed connection area with the top silica microdisk while weakly influencing the resonance modes. The sidewalls of our microdisks were wedge shaped, which was believed to be an advantage for the mode confinement. Efficient coupling from and to the 60 μm diameter microdisk structure was achieved using tapered optical fibres, exhibiting a quality factor of 1.5×104 near a wavelength of 1550 nm. Many resonance modes were observed, and double transverse electric modes were identified by theoretical calculations. The quality factor of the microdisks was also analysed to deduce the cavity roughness. The wet etching technique provides a more convenient avenue to fabricate WGM microdisks than conventional fabrication methods.

Keywords:  whispering gallery mode      wet etching      quality factor  
Received:  23 December 2016      Revised:  21 January 2017      Published:  05 May 2017
PACS:  42.55.Sa (Microcavity and microdisk lasers)  
  42.70.Ce (Glasses, quartz)  
Fund: 

Project supported by the Postdoctoral Science Foundation of China (Grant No. 2015M582041) and the Special Project on the Integration of Industry, Education and Research of Aviation Industry Corporation of China.

Corresponding Authors:  B P Zhang     E-mail:  bzhang@xmu.edu.cn

Cite this article: 

H Long(龙浩), W Yang(杨文), L Y Ying(应磊莹), B P Zhang(张保平) Silica-based microcavity fabricated by wet etching 2017 Chin. Phys. B 26 054211

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