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16 March 2023 Near-field scanning measurement of opto-thermal response of a single nanostructure
Seongmin Im, Hongke Lee, Changhun Lee, Hyunwoong Lee, Ho-Pui Ho, Donghyun Kim
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Proceedings Volume 12396, Plasmonics in Biology and Medicine XX; 1239605 (2023) https://doi.org/10.1117/12.2649464
Event: SPIE BiOS, 2023, San Francisco, California, United States
Abstract
Surface plasmon, collective electron oscillation induced by light absorption in noble metals, has received renewed attention that opens a new area of photonics research in what is known as thermoplasmonics. As thermoplasmonics develops, opto-thermal response measurement of a single nanostructure becomes essential. In this study, we propose a collection-type near-field scanning optical microscopy (NSOM) that can simultaneously measure light absorption and near-field enhancement on a single nanostructure. We analyzed light absorption from optically induced thermal expansion while measuring a near-field coupled with the NSOM tip. We have observed discrepancy and nonlinearity of angular spectrum between light absorption and near-field enhancement on gold thin films and compared with simulation results based on iterative opto-thermal analysis. We were able to determine the cause of the axial shift on the NSOM and the mechanisms by which the discrepancy may ariss. The proposed technique can also acquire optical characteristics of a single disk in a periodic array of gold nanodisks, and even measure the gaps between the disks. Furthermore, we expect the proposed technology to be extended to measuring near-field thermal characteristics of more complicated structure such as metamaterials.
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Seongmin Im, Hongke Lee, Changhun Lee, Hyunwoong Lee, Ho-Pui Ho, and Donghyun Kim "Near-field scanning measurement of opto-thermal response of a single nanostructure", Proc. SPIE 12396, Plasmonics in Biology and Medicine XX, 1239605 (16 March 2023); https://doi.org/10.1117/12.2649464
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KEYWORDS
Near field scanning optical microscopy
Gold
Light absorption
Nanostructures
Plasmonics
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