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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 (SiNx) lm. The long-period gratings with period of 500 μm were induced in standard Corning SMF28 bre using electric arc and nanocoated with SiNx by radio frequency plasma enhanced chemical vapour deposition method. As a sensorial e ect we investigated resonance shift with temperature variations (from 30 to 70 ◦C) for measurement in deionized water (nD = 1.33) and glycerine (nD = 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 (H2O) were obtained which gives refractive index-T sensitivity ratio (RI/T ) of −944 ◦C/RIU. Refractive index and T sensitivity of sensor covered with SiNx lm 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 signi cant in uence of glycerine's thermo-optic coe cient on obtained results was observed. It is worth noticing that SiNx coating stabilizes sensing behaviour of the sensor. DOI: 10.12693/APhysPolA.124.421 PACS: 42.70.Ce, 42.79.Gn, 07.07.Df, 81.20.Fw

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