We have investigated the plasmonic effect of a gold thin film on the optical properties under a range of combinations of incident wavelengths, incident angles and polarization states, while assuming various film thicknesses. Theoretical calculation was performed with rigorous coupled-wave analysis based on the temperature-dependent Drude-Lorentz dispersion model. The calculation method considers the effects of absorption, which is converted to heat in a gold thin film and can affect material parameters such as permittivity. Experimentally, light absorption and field enhancement factor were directly measured using near-field scanning optical microscopy. We have also measured the near-field distribution and thermal effects in the gold thin film. Absorption and field enhancement experimentally measured using three incident wavelengths of 488, 532, and 721 nm for a thin gold film with thicknesses 20, 50, and 70 nm showed good agreement with calculated data. Also observed was the disparity between the incident angles that correspond to maximum absorption and highest field enhancement. The results can help understand the thermal effects on optical properties of plasmonic nanostructures for applications in biological imaging and sensing techniques.
|Title of host publication||Nanoscale Imaging, Sensing, and Actuation for Biomedical Applications XVIII|
|Editors||Dror Fixler, Ewa M. Goldys, Sebastian Wachsmann-Hogiu|
|Publication status||Published - 2021|
|Event||Nanoscale Imaging, Sensing, and Actuation for Biomedical Applications XVIII 2021 - Vierual, Online, United States|
Duration: 2021 Mar 6 → 2021 Mar 11
|Name||Proceedings of SPIE - The International Society for Optical Engineering|
|Conference||Nanoscale Imaging, Sensing, and Actuation for Biomedical Applications XVIII 2021|
|Period||21/3/6 → 21/3/11|
Bibliographical noteFunding Information:
This work was supported by National Research Foundation grants funded by the Korean government (2019R1A4A1025958 and 2019K2A9A2A08000198) and partly sponsored by the Ministry of Trade, Industry and Energy (P048000064). Authors also acknowledge the support from the Korea Medical Device Development Fund (Project Number: 202012B12 and 202011D25).
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All Science Journal Classification (ASJC) codes
- Electronic, Optical and Magnetic Materials
- Condensed Matter Physics
- Computer Science Applications
- Applied Mathematics
- Electrical and Electronic Engineering