Probing Temperature-Induced Plasmonic Nonlinearity: Unveiling Opto-Thermal Effects on Light Absorption and Near-Field Enhancement
In: Nano Letters, Jg. 24 (2024-03-27), Heft 12, S. 3598-3605
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Zugriff:
Precise measurement and control of local heating in plasmonic nanostructures are vital for diverse nanophotonic devices. Despite significant efforts, challenges in understanding temperature-induced plasmonic nonlinearity persist, particularly in light absorption and near-field enhancement due to the absence of suitable measurement techniques. This study presents an approach allowing simultaneous measurements of light absorption and near-field enhancement through angle-resolved near-field scanning optical microscopy with iterative opto-thermal analysis. We revealed gold thin films exhibit sublinear nonlinearity in near-field enhancement due to nonlinear opto-thermal effects, while light absorption shows both sublinear and superlinear behaviors at varying thicknesses. These observations align with predictions from a simple harmonic oscillation model, in which changes in damping parameters affect light absorption and field enhancement differently. The sensitivity of our method was experimentally examined by measuring the opto-thermal responses of three-dimensional nanostructure arrays. Our findings have direct implications for advancing plasmonic applications, including photocatalysis, photovoltaics, photothermal effects, and surface-enhanced Raman spectroscopy.
Titel: |
Probing Temperature-Induced Plasmonic Nonlinearity: Unveiling Opto-Thermal Effects on Light Absorption and Near-Field Enhancement
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Autor/in / Beteiligte Person: | Lee, Hongki ; Im, Seongmin ; Lee, Changhun ; Lee, Hyunwoong ; Chu, Shi-Wei ; Ho, Aaron Ho-Pui ; Kim, Donghyun |
Zeitschrift: | Nano Letters, Jg. 24 (2024-03-27), Heft 12, S. 3598-3605 |
Veröffentlichung: | 2024 |
Medientyp: | serialPeriodical |
ISSN: | 1530-6984 (print) ; 1530-6992 (print) |
DOI: | 10.1021/acs.nanolett.3c04420 |
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