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2015 ; 15
(1
): 776-82
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Photoresistance switching of plasmonic nanopores
#MMPMID25514824
Li Y
; Nicoli F
; Chen C
; Lagae L
; Groeseneken G
; Stakenborg T
; Zandbergen HW
; Dekker C
; Van Dorpe P
; Jonsson MP
Nano Lett
2015[Jan]; 15
(1
): 776-82
PMID25514824
show ga
Fast and reversible modulation of ion flow through nanosized apertures is
important for many nanofluidic applications, including sensing and separation
systems. Here, we present the first demonstration of a reversible
plasmon-controlled nanofluidic valve. We show that plasmonic nanopores
(solid-state nanopores integrated with metal nanocavities) can be used as a
fluidic switch upon optical excitation. We systematically investigate the effects
of laser illumination of single plasmonic nanopores and experimentally
demonstrate photoresistance switching where fluidic transport and ion flow are
switched on or off. This is manifested as a large (? 1-2 orders of magnitude)
increase in the ionic nanopore resistance and an accompanying current
rectification upon illumination at high laser powers (tens of milliwatts). At
lower laser powers, the resistance decreases monotonically with increasing power,
followed by an abrupt transition to high resistances at a certain threshold
power. A similar rapid transition, although at a lower threshold power, is
observed when the power is instead swept from high to low power. This hysteretic
behavior is found to be dependent on the rate of the power sweep. The
photoresistance switching effect is attributed to plasmon-induced formation and
growth of nanobubbles that reversibly block the ionic current through the
nanopore from one side of the membrane. This explanation is corroborated by
finite-element simulations of a nanobubble in the nanopore that show the
switching and the rectification.
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