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

Abstract

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 $\sim 4900\mathrm{nm}/\mathrm{RIU}$ (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 $\sim {10}^{-7}$. Such high resolution sensors enable detection of minute changes with potential applications to various biochemical industries.

© 2013 Optical Society of America

Bragg grating based biochemical sensor using submicron Si/SiO₂ waveguides for lab-on-a-chip applications: a novel design

Saurabh Mani Tripathi, Arun Kumar, Emmanuel Marin, and Jean-Pierre Meunier
Appl. Opt. 48(23) 4562-4567 (2009)

Refractive-index sensor based on long-range surface plasmon mode excitation with long-period waveguide grating

Q. Liu and K. S. Chiang
Opt. Express 17(10) 7933-7942 (2009)

Theoretical model of a planar integrated refractive index sensor based on surface plasmon-polariton excitation with a long period grating

Galina Nemova and Raman Kashyap
J. Opt. Soc. Am. B 24(10) 2696-2701 (2007)

Long-period grating refractive index sensor with a modified cladding structure for large operational range and high sensitivity

Jian Yang, Li Yang, Chang-Qing Xu, Chenglin Xu, Weiping Huang, and Yingfu Li
Appl. Opt. 45(24) 6142-6147 (2006)

Long-period gratings in polymer ridge waveguides

Q. Liu, K. S. Chiang, and K. P. Lor
Opt. Express 13(4) 1150-1160 (2005)