Tunable and reversible thermo-plasmonic hot spot imaging for temperature confinement
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RESEARCH
Tunable and reversible thermo‑plasmonic hot spot imaging for temperature confinement N. S. Shnan1,2 · N. Roostaei1 · S. M. Hamidi1 Received: 26 July 2020 / Accepted: 4 September 2020 © Islamic Azad University 2020
Abstract In 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. Keywords Plasmonic imaging system · Plasmonic hot spot · 2D grating · Nanoimprint lithography · Temperature confinement
Introduction Plasmonic nanostructures have been proposed as a new efficient heat source when illuminated by their correspondence resonance light source [1, 2] regarding the nanoscale control of temperature distribution [3], drug delivery [4, 5], cancer photo-thermal therapy [6, 7], photo-thermal imaging [8], and various other useful applications. These applications should be capable of measuring the temperature distribution in a sufficient area with a high signal-to-noise ratio (SNR). Nowadays, different evidence is available concerning the metal nanoparticle-based structure for satisfying the abovementioned SNR in the temperature distribution, resulting in introducing novel development in chemistry and biology while not in the physics [9]. All these evaluations aim to establish a better understanding about the physical phenomenon such as the thermo-plasmonic effect in nanoparticle-based structures [10], nanorod-based structures * S. M. Hamidi [email protected] 1
Magneto‑plasmonic Lab, Laser and Plasma Research Institute, Shahid Beheshti University, Tehran, Iran
Department of Laser Physics, College of Science for Woman, University of Babylon, Babylon, Iraq
2
[11], and self-assembled nanoparticles [12] in order to have preferable SNR onto the arrays of nanoparticles [13]. The proposed arrays can solve the SNR in the large area of the nanostructure for helping interested scientists. In addition, reports exist onto an optical microscopy technique in order to quantitatively map the temperature distribution around the nanometric sources of heat by experimental and simulation results [14]. Although it is considered as the best use of plasmon-based localization in these new kinds of nano-sources of heat, controlling this heating amount, and supported area remains unkno
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