Temperature Cross-Sensitivity for Highly Refractive Index Sensitive Nanocoated Long-Period Gratings

• Authors: J. Grochowski , M. Myśliwiec , P. Mikulic , W. Bock , M. Śmietana
• Languages of publication: EN

Abstracts

EN

There is a demand for highly refractive index sensitive devices simultaneously insensitive to temperature (T) changes. We investigate both T and refractive index sensitivity of long-period gratings coated with 100 nm thin high refractive index (n ≈ 1.9 at λ = 1550 nm) silicon nitride (SiN_{x}) film. The long-period gratings with period of 500 μm were induced in standard Corning SMF28 fibre using electric arc and nanocoated with SiN_{x} by radio frequency plasma enhanced chemical vapour deposition method. As a sensorial effect we investigated resonance shift with temperature variations (from 30 to 70°C) for measurement in deionized water (n_{D} = 1.33) and glycerine (n_{D} = 1.46). In case of measurements in water for resonance observed at λ = 1510 nm, refractive index sensitivity of - 85 nm/RIU and temperature sensitivity of 0.09 nm/C (H_2O) were obtained which gives refractive index-T sensitivity ratio (RI/T) of - 944°C/RIU. Refractive index and T sensitivity of sensor covered with SiN_{x} film increased to - 618 nm/RIU and 0.22 nm/°C, respectively. Thanks to nanocoating deposition, refractive index-T sensitivity ratio was improved by factor of 3. In case of measurements in glycerine significant influence of glycerine's thermo-optic coefficient on obtained results was observed. It is worth noticing that SiN_{x} coating stabilizes sensing behaviour of the sensor.

Keywords

EN

42.70.Ce; 42.79.Gn; 07.07.Df; 81.20.Fw

Discipline

• 42.70.Ce: Glasses, quartz
• 42.79.Gn: Optical waveguides and couplers(for fiber waveguides and waveguides in integrated optics, see 42.81.Qb and 42.82.Et, respectively)
• 07.07.Df: Sensors (chemical, optical, electrical, movement, gas, etc.); remote sensing
• 81.20.Fw: Sol-gel processing, precipitation(for reactions in sol-gels, see 82.33.Ln; for sol-gels as disperse system, see 82.70.Gg)

• Publisher: Institute of Physics, Polish Academy of Sciences
• Journal: Acta Physica Polonica A
• Year: 2013
• Volume: 124
• Issue: 3
• Pages: 421-424

Dates

published

2013-09

Contributors

author

J. Grochowski

• Institute of Microelectronics and Optoelectronics, Warsaw University of Technology, Koszykowa 75, 00-662 Warsaw, Poland

author

M. Myśliwiec

• Institute of Microelectronics and Optoelectronics, Warsaw University of Technology, Koszykowa 75, 00-662 Warsaw, Poland

author

P. Mikulic

• Centre de Recherche en Photonique, Université du Québec en Outaouais 101 Rue St Jean Bosco, Pavillon Lucien Brault, Gatineau, Québec, J8X 3X7, Canada

author

W. Bock

• Centre de Recherche en Photonique, Université du Québec en Outaouais 101 Rue St Jean Bosco, Pavillon Lucien Brault, Gatineau, Québec, J8X 3X7, Canada

author

M. Śmietana

• Institute of Microelectronics and Optoelectronics, Warsaw University of Technology, Koszykowa 75, 00-662 Warsaw, Poland

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Identifiers

DOI

10.12693/APhysPolA.124.421