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Optics Letters

Optics Letters

| RAPID, SHORT PUBLICATIONS ON THE LATEST IN OPTICAL DISCOVERIES

  • Editor: Xi-Cheng Zhang
  • Vol. 39, Iss. 1 — Jan. 1, 2014
  • pp: 26–29

Nonlinearly enhanced refractive index sensing in coupled optical microresonators

Chao Wang and Christopher P. Search  »View Author Affiliations


Optics Letters, Vol. 39, Issue 1, pp. 26-29 (2014)
http://dx.doi.org/10.1364/OL.39.000026


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Abstract

We study the use of nonlinear self-phase modulation (SPM) in coupled optical microresonators for ultrasensitive refractive index sensing. SPM leads to a positive feedback enhancement of the resonance frequency shift caused by a perturbation of the index of refraction in a resonator. Moreover, the use of two resonators coupled through input and output waveguides leads to a further improvement in the sensitivity owing to constructive interference and feedback via the waveguides. For parameters based on Si microresonators, the sensitivity is more than 102 larger than a single resonator without SPM leading to a minimum detectable index change of 1011RIU with resonator Q-factors of 104. We show that the nonlinearly enhanced system is robust with respect to laser noise when operated at input powers below the onset of bistability.

© 2013 Optical Society of America

OCIS Codes
(130.6010) Integrated optics : Sensors
(190.1450) Nonlinear optics : Bistability
(230.4555) Optical devices : Coupled resonators

ToC Category:
Optical Devices

History
Original Manuscript: August 9, 2013
Revised Manuscript: October 23, 2013
Manuscript Accepted: November 13, 2013
Published: December 17, 2013

Citation
Chao Wang and Christopher P. Search, "Nonlinearly enhanced refractive index sensing in coupled optical microresonators," Opt. Lett. 39, 26-29 (2014)
http://www.opticsinfobase.org/ol/abstract.cfm?URI=ol-39-1-26

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