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 H2 concentration from 0.5% to 4%. Comparing to the only Pd film, TPP sensor has increased the sensitivity about 100% at visible wavelengths.
Tamm plasmon polariton (TPP) resonance with a palladium (Pd) thin film is proposed for use in optical hydrogen sensors. With optimized design, near-zero reflectance can be achieved by TPP resonance, leading to more than 3 orders of magnitude changes in reflectance compared to the pure Pd film. image