Tip-based measurement of the spectral and angular response of plasmonic thin films

Hongki Lee, Seongmin Im, Changhun Lee, Donghyun Kim

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Abstract

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.

Original languageEnglish
Title of host publicationNanoscale Imaging, Sensing, and Actuation for Biomedical Applications XVIII
EditorsDror Fixler, Ewa M. Goldys, Sebastian Wachsmann-Hogiu
PublisherSPIE
ISBN (Electronic)9781510641518
DOIs
Publication statusPublished - 2021
EventNanoscale Imaging, Sensing, and Actuation for Biomedical Applications XVIII 2021 - Vierual, Online, United States
Duration: 2021 Mar 62021 Mar 11

Publication series

NameProceedings of SPIE - The International Society for Optical Engineering
Volume11658
ISSN (Print)0277-786X
ISSN (Electronic)1996-756X

Conference

ConferenceNanoscale Imaging, Sensing, and Actuation for Biomedical Applications XVIII 2021
Country/TerritoryUnited States
CityVierual, Online
Period21/3/621/3/11

Bibliographical note

Publisher Copyright:
© 2021 SPIE. All rights reserved.

All Science Journal Classification (ASJC) codes

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics
  • Computer Science Applications
  • Applied Mathematics
  • Electrical and Electronic Engineering

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