Abstract
We report the plasmonic photoelectric conversion phenomenon acquired by plasmons of metal nanostructures. The photoelectric conversion device consists of plasmonic atoms and a thin film of thermoelectric material. We detected electric current flowing the thermoelectric material when plasmons of the nanostructure are excited. This photoelectric conversion is attributed to the plasmonic local heat induced by plasmons. The plasmonic local heat propagated to the surrounding thermoelectric film, resulting in a thermal gradient which generate electric currents via Seebeck effect. In addition, we observed that the plasmonic nanohole arrays without thermoelectric materials also exhibit photoelectric conversion. Its photoelectric conversion efficiency was 0.0015%. In this paper, we discussed the wavelength dependencies and conversion efficiencies of the plasmonic photoelectric conversion. Moreover, we calculated the theoretical thermal degrees of the plasmonic local heat in order to discuss the plasmonic local heat propagation and dissipation.
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