Open Access Nano Express

Hybrid FIB milling strategy for the fabrication of plasmonic nanostructures on semiconductor substrates

Joshua F Einsle1*, Jean-Sebastien Bouillard2, Wayne Dickson2 and Anatoly V Zayats2

Author Affiliations

1 Centre for Nanostructured Media, IRCEP, The Queen's University of Belfast, Belfast, BT7 1NN, UK

2 Department of Physics, King's College London, Strand, London WC2R 2LS, UK

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Nanoscale Research Letters 2011, 6:572  doi:10.1186/1556-276X-6-572

Published: 31 October 2011

Abstract

The optical properties of plasmonic semiconductor devices fabricated by focused ion beam (FIB) milling deteriorate because of the amorphisation of the semiconductor substrate. This study explores the effects of combining traditional 30 kV FIB milling with 5 kV FIB patterning to minimise the semiconductor damage and at the same time maintain high spatial resolution. The use of reduced acceleration voltages is shown to reduce the damage from higher energy ions on the example of fabrication of plasmonic crystals on semiconductor substrates leading to 7-fold increase in transmission. This effect is important for focused-ion beam fabrication of plasmonic structures integrated with photodetectors, light-emitting diodes and semiconductor lasers.