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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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Publication details

The article was received on 03 Jun 2014, accepted on 22 Jul 2014 and first published on 25 Jul 2014


Article type: Paper
DOI: 10.1039/C4CP02437K
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Phys. Chem. Chem. Phys., 2014,16, 19402-19407

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    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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