[20p-C304-1~14] 4.1 Plasmonics and Nanophotonics

▲ [20p-C304-6] Effect of Nanohole Periodicty on Responsivity of BiTe Thin-film Photodetector

〇(M1)Toshinari Odaka¹, Wakana Kubo¹ (1.Tokyo Univ. of Agri. and Technol.)

Keywords:thermoelectric conversion, plasmon, nanohole

To clarify the effect of the nanohole (NH) periodicity on the thermoelectric properties of the bismuth telluride (BiTe) compound thin film photodetector, we prepared photodetectors with different NH periodicities and investigated the relationship among the NH periodicity, extinction, and responsivity. The photodetector is driven by photo-thermoelectric conversion and detects incident light through light absorption and thermoelectric conversion of a thin film with nanohole NH arrays. The NH periodicity may inhibit the phonon transportation, resulting in a reduction of thermal conductivity of the film and an improvement in thermoelectric property.