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(Color online) (a) Schematics of the experimental setup. (b) AFM image of the device. Edge dimensions are 2.5 μm and the SPPs are excited on the interface between SU-8 and silver in the direction of the arrow.
(Color online) (a) Gate voltage sweeps with SPPs on and off. Four traces were averaged for each curve to decrease the noise level (negligible hysteresis). V ds = 10 mV. (b) Drain-source current as a function of V g and V ds. 1.96 eV SPPs are switched off by polarization. V ds is the fast scan axis (23 s for one line) and V g is the slow scan axis. (c) A corresponding measurement for the same device with SPPs switched on. (d) V g sweeps with excitation by white light and plasmon energy adjusted with the angle of incidence. 1.7 eV excitation angle was used in the measurement with SPPs off. V ds = 10 mV.
(Color online) A typical measurement of the current response to laser exposure and SPP excitation controlled by polarization. Exponential fits are provided for desorption (dotted) and adsorption (dashed). V g = −0.4 V, V ds = 10 mV.
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