Polarization dependency in metal oxide coated tilted FBG refractometers

Jean-Michel Renoirt; Chao Zhang; Marc Debliquy; Christophe Caucheteur; Marie-Georges Olivier; Patrice Mégret

doi:10.1117/12.922262

9 May 2012 Polarization dependency in metal oxide coated tilted FBG refractometers

Jean-Michel Renoirt, Chao Zhang, Marc Debliquy, Christophe Caucheteur, Marie-Georges Olivier, Patrice Mégret

Author Affiliations +

Proceedings Volume 8439, Optical Sensing and Detection II; 84392H (2012) https://doi.org/10.1117/12.922262
Event: SPIE Photonics Europe, 2012, Brussels, Belgium

Abstract

Tilted fiber Bragg gratings (TFBGs) present a refractive index modulation blazed by a few degrees in the plane perpendicular to the optical fiber axis. This results in two kinds of couplings: self-backward coupling of the core mode and numerous backward couplings between the core mode and the cladding modes. TFBG transmitted amplitude spectra are therefore characterized by several tens of cladding mode resonances that possess their own sensitivity to the surrounding refractive index (SRI). TFBGs naturally allow the realization of refractometers accurate to 10^-4 RIU (refractive index unit) in the SRI range between 1.33 and 1.45 (refractive index of silica). In this work, we demonstrate that a dense thin film of zinc oxide, a high refractive index material (n=1.9), deposited by RF sputtering in two steps, on the TFBGs tightly modifies their transmitted amplitude spectra. While the wavelength difference between orthogonally polarized modes in nude TFBGs remains within a few picometers, the association of a nanoscale metal oxide coating increases this difference up to 500 picometers. This results in two main assets: the sensitivity is extended to SRI values above 1.45 while the strong polarization dependency makes the demodulation process easier.

Citation Download Citation

Jean-Michel Renoirt, Chao Zhang, Marc Debliquy, Christophe Caucheteur, Marie-Georges Olivier, and Patrice Mégret "Polarization dependency in metal oxide coated tilted FBG refractometers", Proc. SPIE 8439, Optical Sensing and Detection II, 84392H (9 May 2012); https://doi.org/10.1117/12.922262

ACCESS THE FULL ARTICLE

INSTITUTIONAL
Select your institution to access the SPIE Digital Library.

SELECT YOUR INSTITUTION

PERSONAL
Sign in with your SPIE account to access your personal subscriptions or to use specific features such as save to my library, sign up for alerts, save searches, etc.

PERSONAL SIGN IN

No SPIE Account? Create one

;

PURCHASE THIS CONTENT

SUBSCRIBE TO DIGITAL LIBRARY

50 downloads per 1-year subscription

Members: $195

Non-members: $335 ADD TO CART

25 downloads per 1 - year subscription

Members: $145

Non-members: $250 ADD TO CART

PURCHASE SINGLE ARTICLE