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Issue 36, 2014
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An IR modulator based on the self-assembly of gold nanoparticles on germanium

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Abstract

By using a polyelectrolyte layer gold nanoparticles have been assembled onto a Ge internal reflection element. Upon illumination with visible and near infrared light strong infrared absorption has been observed, which can be traced to intervalence band transitions in Ge. This reveals the existence of holes in the Ge near its valence band edge. The switching between light and dark states is faster than 160 μs and the device acts as an infrared modulator. The effect develops with a peculiar kinetics, which may indicate the development of an interfacial layer between germanium and gold that allows efficient electron transfer upon illumination.

Graphical abstract: An IR modulator based on the self-assembly of gold nanoparticles on germanium

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Article information


Submitted
03 Jun 2014
Accepted
22 Jul 2014
First published
25 Jul 2014

Phys. Chem. Chem. Phys., 2014,16, 19402-19407
Article type
Paper
Author version available

An IR modulator based on the self-assembly of gold nanoparticles on germanium

H. Ghosh, A. Bouhekka and T. Bürgi, Phys. Chem. Chem. Phys., 2014, 16, 19402
DOI: 10.1039/C4CP02437K

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