Abstract
In this work, we experimentally investigate the photoconductance behavior of gold nano-island film due to the plasmonic effect. The current-voltage measurements are performed under continuous wave (CW) low laser irradiance at the wavelength properly matching the localized surface plasmon resonance (LSPR), λ = 532 nm. We measure the photoconductance of the nanostructured film as a function of laser irradiance. An enhancement of the film´s current is observed by increasing the applied voltage and the laser irradiance. Furthermore, our results show that the photoconductance is attributed to an additional voltage induced by the strong confined plasmonic electric field on the nano-islands’ surface. The experimental results are in good agreement with the Simmons’ model of electron tunneling.
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