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Optics Letters

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  • Editor: Alan E. Willner
  • Vol. 38, Iss. 24 — Dec. 15, 2013
  • pp: 5405–5408

Suspended ultra-small disk resonator on silicon for optical sensing

Xiaokun Wang, Xiaowei Guan, Qiangsheng Huang, Jiajiu Zheng, Yaocheng Shi, and Daoxin Dai  »View Author Affiliations


Optics Letters, Vol. 38, Issue 24, pp. 5405-5408 (2013)
http://dx.doi.org/10.1364/OL.38.005405


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Abstract

An ultra-small disk resonator consisting of a suspended silicon disk with a submicron bending radius sitting on an SiO2 pedestal is demonstrated experimentally. An asymmetrical suspended rib waveguide is integrated as the access waveguide for the suspended submicron disk resonator, which is used to realize an ultra-small optical sensor with an improved sensitivity due to the enhanced evanescent field interaction with the analyte. The present optical sensor also has a large measurement range because of the ultra-large free-spectral range of the submicron-disk resonator. As an example, a suspended submicron disk sensor with a bending radius of 0.8 μm is designed, fabricated, and characterized. The concentration of NaCl aqueous solution and organic liquids is measured with the suspended submicron-disk sensor, and the measured sensitivity is about 130nm/RIU, which agrees well with the simulation value.

© 2013 Optical Society of America

OCIS Codes
(130.2790) Integrated optics : Guided waves
(130.3120) Integrated optics : Integrated optics devices
(230.7370) Optical devices : Waveguides

ToC Category:
Integrated Optics

History
Original Manuscript: September 13, 2013
Revised Manuscript: November 1, 2013
Manuscript Accepted: November 13, 2013
Published: December 11, 2013

Citation
Xiaokun Wang, Xiaowei Guan, Qiangsheng Huang, Jiajiu Zheng, Yaocheng Shi, and Daoxin Dai, "Suspended ultra-small disk resonator on silicon for optical sensing," Opt. Lett. 38, 5405-5408 (2013)
http://www.opticsinfobase.org/ol/abstract.cfm?URI=ol-38-24-5405


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