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Optics Letters

Optics Letters


  • Editor: Alan E. Willner
  • Vol. 35, Iss. 24 — Dec. 15, 2010
  • pp: 4229–4231

Highly sensitive Si nanowire-based optical sensor using a Mach–Zehnder interferometer coupled microring

Jianwei Wang and Daoxin Dai  »View Author Affiliations

Optics Letters, Vol. 35, Issue 24, pp. 4229-4231 (2010)

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A Mach–Zehnder interferometer (MZI) coupled microring is demonstrated experimentally to obtain a high sensitivity as well as a large range for measuring change in refractive index. For the present MZI-coupled microring, there is a major resonance wavelength with a high extinction ratio (16–36 dB) in a very large wavelength span. Consequently, a very large quasi-free spectral range ( > 120 nm ) is achieved, which helps to obtain a large measurement range. The MZI-coupled microring sensor is used for measuring the change of the ambient refractive index ranging from 1.0 to 1.538, and the sensitivity is as high as 111 nm /refractive index unit.

© 2010 Optical Society of America

OCIS Codes
(230.3120) Optical devices : Integrated optics devices
(230.5750) Optical devices : Resonators

ToC Category:
Integrated Optics

Original Manuscript: August 16, 2010
Revised Manuscript: November 7, 2010
Manuscript Accepted: November 27, 2010
Published: December 16, 2010

Jianwei Wang and Daoxin Dai, "Highly sensitive Si nanowire-based optical sensor using a Mach–Zehnder interferometer coupled microring," Opt. Lett. 35, 4229-4231 (2010)

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