| Summary: | 碩士 === 國立交通大學 === 影像與生醫光電研究所 === 107 === Tamm plasmon polaritons (TPPs) resonance can be excited within the stopband of a distributed Bragg reflector (DBR) by combining a thin metal film. In this work, the proposed TPPs hydrogen sensor is with palladium (Pd) on the top. When reacting with the hydrogen gas, the TPP resonance wavelength will be red-shifted due to the hydrogen-induced palladium lattice expansion. By utilizing the DBR-side TPP structure, the 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 to detect with low H2 concentration in N2 at visible wavelengths. The sensitivity of proposed TPP hydrogen sensor have a linear response from 0.5 vol.% to 4 vol.% H2 in N2, which has the limit of detection (LOD) about 0.29 vol.%.
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