OICC Press Journal of Theoretical and Applied Physics 2251-7235 14 4 2023 11 17 Tunable and reversible thermo-plasmonic hot spot imaging for temperature confinement 10.1007/s40094-020-00393-2 EN N. S. Shnan Department of Laser Physics, College of Science for Woman, University of Babylon, Babylon, Iraq N. Roostaei Magneto‑plasmonic Lab, Laser and Plasma Research Institute, Shahid Beheshti University, Tehran, Iran S. M. Hamidi Magneto‑plasmonic Lab, Laser and Plasma Research Institute, Shahid Beheshti University, Tehran, Iran 0000-0002-5298-2224 Journal Article 2023 11 17 AbstractIn the present study, a novel tunable two-dimensional thermo-plasmonic grating based on gold nanorods was demonstrated by combining the plasmonic properties of the gold nanostructure and the applied external voltage. In this structure, a thin layer of the gold grating was typically deposited on a patterned polydimethylsiloxane substrate using the nanoimprint lithography method. The surface plasmon resonance of the fabricated plasmonic structure was excited by the surface plasmon imaging system based on a high numerical aperture objective lens and the charged coupled device camera. Based on the results, the number of the plasmonic hot spots due to the thermo-plasmonic effect increased by the external voltage, leading to an increase in this effect. Therefore, this reversible and tunable temperature confinement can be used as the controller of each element including cells in a defined micro-position.