Figure 6: Photo-induced current in plasmonic gaps.
From: Quantum mechanical effects in plasmonic structures with subnanometre gaps
(a) Optical rectification voltage Vopt as a function of gap distance (top axis) or junction conductance G (bottom axis) for nanogap junctions fabricated via electromigration. Error bars indicate the statistical uncertainty in Vopt and ln G. Image reproduced from ref. 93. Copyright 2010 Nature Publishing Group. (b) Schematic illustration of an Au electrical plasmon detector. Creation of SPPs is achieved by normal illumination of the grating by a laser via a microscope objective. (c) SPP-modulated conductance histogram measured with the set-up in b. Irradiation appears to shift the Gaussian describing the distribution of conductance values around ∼1G0 (‘light-off’ conductance) to a new and higher mean value (‘light-on’ conductance). (b,c) Images are reprinted with permission from ref. 107. Copyright 2011 American Chemical Society. (d) Field enhancement in a plasmonic nanogap estimated from the rectification current. Reprinted with permission from ref. 108. Copyright 2011 American Chemical Society.
