Numerical and experimental analysis of optical response of sub-wavelength period structure in carbonaceous film for refractive index sensing

作者：Tamulevicius Tomas^*; Grazuleviciute Ieva; Urbonas Darius; Gabalis Martynas; Petruskevicius Raimondas; Tamulevicius Sigitas

来源：Optics Express, 2014, 22(22): 27462-27475.

DOI：10.1364/OE.22.027462

The resonance structure coupling the light into the leaky guided modes, which are visible in the reflection spectra as sharp peaks (Wood%26apos;s anomalies), is analyzed experimentally and numerically. The guided mode resonance structure of 428 nm period patterned in a carbonaceous film demonstrated sensitivity of 70 nm/RIU. The calculated mode diagram explained the nature and positions of the peaks registered experimentally. The reflection spectra, near/far field distributions and field penetration depth for the analyzed structure were simulated employing three numerical solvers. The set of weak Rayleigh%26apos;s anomalies was indentified from the simulations and the experimental data.

• 出版日期2014-11-3