Tamm Plasmon Polaritons Hydrogen Sensors
Yu‐Sheng Chen, Zih‐Ying Yang, Ming‐Jyun Ye, Wen-Hsiang Wu, Lu‐Hsing Chen, Hung‐Jung Shen, Satoshi Ishii, Tadaaki Nagao, Kuo‐Ping Chen
Abstract
Abstract Tamm plasmon polariton (TPP) resonance can be excited within the stopband of a distributed Bragg reflector (DBR) by combining a thin metal film. When exposured to hydrogen gas, the TPP resonance feature is redshifted for the TPPs structure with palladium (Pd) on the top, due to hydrogen‐induced palladium lattice expansion. By utilizing a DBR‐side TPP structure, near‐zero reflectance can be achieved, leading to more than 3 orders of magnitude changes in reflectance compared to metal‐side TPP structure. The proposed TPP hydrogen structure enables the detection with low H 2 concentration from 0.5% to 4%. Comparing to the only Pd film, TPP sensor has increased the sensitivity about 100% at visible wavelengths.