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Applied Optics

Applied Optics


  • Editor: Joseph N. Mait
  • Vol. 52, Iss. 10 — Apr. 1, 2013
  • pp: 2086–2092

Polarization-based refractive index sensor using dual asymmetric long-period gratings in ridge waveguides

Ruchi Garg and K. Thyagarajan  »View Author Affiliations

Applied Optics, Vol. 52, Issue 10, pp. 2086-2092 (2013)

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We propose a sensor scheme operating in the wavelength band of 1460–1530 nm (S band) that utilizes two orthogonally polarized eigenmodes in a ridge-waveguide geometry by employing a pair of nonidentical asymmetric long-period gratings. Numerical simulations show a high sensitivity 4900nm/RIU (refractive index unit) over the refractive index range 1.33–1.34 exhibiting a relative resonance shift of 1 pm for an index change of 107. Such high resolution sensors enable detection of minute changes with potential applications to various biochemical industries.

© 2013 Optical Society of America

OCIS Codes
(130.3120) Integrated optics : Integrated optics devices
(130.6010) Integrated optics : Sensors
(350.2770) Other areas of optics : Gratings
(130.5440) Integrated optics : Polarization-selective devices

ToC Category:
Integrated Optics

Original Manuscript: November 20, 2012
Revised Manuscript: February 26, 2013
Manuscript Accepted: February 26, 2013
Published: March 26, 2013

Virtual Issues
Vol. 8, Iss. 5 Virtual Journal for Biomedical Optics

Ruchi Garg and K. Thyagarajan, "Polarization-based refractive index sensor using dual asymmetric long-period gratings in ridge waveguides," Appl. Opt. 52, 2086-2092 (2013)

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