Effective tuning of long-period grating refractive-index sensitivity by plasma-deposited diamond-like carbon nano-coatings

Mateusz Smietana; Wojtek J. Bock; Predrag Mikulic; Jan Szmidt

doi:10.1117/12.885908

18 May 2011 Effective tuning of long-period grating refractive-index sensitivity by plasma-deposited diamond-like carbon nano-coatings

Mateusz Smietana, Wojtek J. Bock, Predrag Mikulic, Jan Szmidt

Author Affiliations +

Proceedings Volume 7753, 21st International Conference on Optical Fiber Sensors; 77539F (2011) https://doi.org/10.1117/12.885908
Event: 21st International Conference on Optical Fibre Sensors (OFS21), 2011, Ottawa, Canada

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.

Citation Download Citation

Mateusz Smietana, Wojtek J. Bock, Predrag Mikulic, and Jan Szmidt "Effective tuning of long-period grating refractive-index sensitivity by plasma-deposited diamond-like carbon nano-coatings", Proc. SPIE 7753, 21st International Conference on Optical Fiber Sensors, 77539F (18 May 2011); https://doi.org/10.1117/12.885908

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