Metamaterial for Hydrogen Sensing

• DOI: 10.1021/acssensors.9b00980
• Publication Date: 2019-08-15T08:27:11Z
• Authors: Takaaki Beni; Naoki Yamasaku; Takuma Kurotsu; Naoki To; Shinji Okazaki; Taro Arakawa; Armandas Balčytis; Gediminas Seniutinas; Saulius Juodkazis; Yoshiaki Nishijima
• Keywords: Time Factors; Nanotechnology; 535; 02 engineering and technology; 0210 nano-technology; Palladium; Hydrogen

A hydrogen sensor based on plasmonic metasurfaces is demonstrated to exhibit the industry-required 10 s reaction time and sensitivity. It consists of a layer either Y or WO3 sandwiched between top Pd nanodisk Au mirror at base. The phase change (Y, WO3) reacts with hydrogen, corresponding refractive index (permittivity) detected by spectral shift resonance dip in reflectance IR window. This direct readout permittivity due uptake fast facilitated radiation field enhancement extending into volume. Numerical modeling was used elucidate effects that real imaginary parts exert shifts resonance. mechanism performance outlined, possibility tune its range operation diameter thickness material makes this design applicable other molecular detection applications including surface-enhanced absorption.