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Proceedings Paper

Effective tuning of long-period grating refractive-index sensitivity by plasma-deposited diamond-like carbon nano-coatings
Author(s): Mateusz Smietana; Wojtek J. Bock; Predrag Mikulic; Jan Szmidt
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Paper Abstract

This work presents an application of radio-frequency plasma-assisted chemical-vapor-deposited (RF PACVD) diamondlike carbon (DLC) nano-coatings for effective tuning of the refractive-index (RI) sensitivity of long-period gratings (LPGs) over a wide range (nD from 1 to 1.47). The technique allows for an efficient deposition of good quality nanofilms as required for optical sensors. The thin overlay effectively changes the distribution of the cladding modes and thus tunes the device's RI sensitivity. We correlated the optical properties of the DLC films with the RI sensitivity of the LPGs. For the developed deposition process parameters, the tuning can be realized simply by varying the length of time taken to deposit the high-refractive-index (n>2 @ λ=1460 nm) DLC film. The advantage of this approach is its speed (the deposition process takes at most 7 minutes) and precision in determining the RI sensitivity of the LPGs.

Paper Details

Date Published: 18 May 2011
PDF: 4 pages
Proc. SPIE 7753, 21st International Conference on Optical Fiber Sensors, 77539F (18 May 2011); doi: 10.1117/12.885908
Show Author Affiliations
Mateusz Smietana, Univ. du Québec en Outaouais (Canada)
Warsaw Univ. of Technology (Poland)
Wojtek J. Bock, Univ. du Québec en Outaouais (Canada)
Predrag Mikulic, Univ. du Québec en Outaouais (Canada)
Jan Szmidt, Warsaw Univ. of Technology (Poland)

Published in SPIE Proceedings Vol. 7753:
21st International Conference on Optical Fiber Sensors
Jacques Albert; Wojtek J. Bock, Editor(s)

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