International Conference PhysicA.SPb/2023

Study of photoinduced processes in single solid-state nanopores with integrated plasmonic structures

N. V. Vaulin^ab, P. K. Afonicheva^b, D. V. Lebedev^abc, A. S. Bukatin^ab, I. S. Mukhin^a, A. A. Evstrapov<sup>b

a</sup> Alferov Federal State Budgetary Institution of Higher Education and Science Saint Petersburg National Research Academic University of the Russian Academy of Sciences, St. Petersburg, Russia
^b Institute for Analytical Instrumentation, Russian Academy of Sciences, St. Petersburg, Russia
^c Saint Petersburg State University, St. Petersburg, Russia

Abstract: The transport properties of solid-state nanopores with integrated plasmonic bow-tie antennas are studied. Plasmonic antennas were formed on “freely suspended” SiN membranes 20 nm thick. Nanopores with a diameter of $\sim$5 nm were formed in the regions between the arms of the plasmonic bow-tie antennas. Irradiation of the nanopore region with a laser with a wavelength of 632 nm leads to an increase in the level of ion current and an increase in the conductivity of the pore by 10%. Irradiation of a membrane of similar thickness without a nanopore does not lead to a sustained increase in the current level. The increase in nanopore conductivity may be associated with a change in the configuration of double electrical layers on the pore walls, as well as with local heating of the pore region caused by the presence of plasmonic structures.

Keywords: SiN membrane, plasmonic antennas, microfluidics, ion transport, optical lithography.

Received: 19.05.2023
Revised: 26.07.2023
Accepted: 30.10.2023

DOI: 10.61011/FTT.2023.12.56760.5216k

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