Plasmonic super-localization using nano-post arrays for biomedical spectroscopy

Hongki Lee, Donghyun Kim

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

Abstract

Plasmonic nanostructures enable field confinement which is locally amplified within sub-diffraction limited volume. The localized near-field can be useful in many biomedical sensing and imaging applications. In this research, we present the near-field characteristics localized by plasmonic nano-post arrays for biomedical spectroscopy. Circular gold nano-post arrays were modeled on gold and chrome films fabricated on a glass substrate whose thickness was 50, 20 and 2 nm, respectively. The nano-post arrays were fabricated with an e-beam lithography and a diameter of the post was 250 nm with periods varied as 500, 700, and 900 nm. The field localization produced by nano-posts was induced by angled illumination with a total internal reflection fluorescence microscope objective lens and measured by a near-field scanning optical microscope (NSOM). The NSOM has a tapered fiber probe with a 70-nm aperture and was a continuous-wave laser whose wavelength is 532 nm as light source. Incident TM-polarized light exhibited field localization on one side of an individual gold nano-post. When the direction of light incidence was changed opposite, localized field was switched to the opposite edge of the circular nano-post. We performed 3D finite difference time domain s for the field calculation and confirmed the localized field distribution at given illumination angles. We also discuss the potential applications of plasmonic field localization for analysis of biomolecules, cells, and tissues.

Original languageEnglish
Title of host publicationNanoscale Imaging, Sensing, and Actuation for Biomedical Applications XIV
EditorsDan V. Nicolau, Dror Fixler, Alexander N. Cartwright
PublisherSPIE
ISBN (Electronic)9781510605954
DOIs
Publication statusPublished - 2017 Jan 1
EventNanoscale Imaging, Sensing, and Actuation for Biomedical Applications XIV 2017 - San Francisco, United States
Duration: 2017 Jan 302017 Feb 1

Publication series

NameProgress in Biomedical Optics and Imaging - Proceedings of SPIE
Volume10077
ISSN (Print)1605-7422

Other

OtherNanoscale Imaging, Sensing, and Actuation for Biomedical Applications XIV 2017
CountryUnited States
CitySan Francisco
Period17/1/3017/2/1

All Science Journal Classification (ASJC) codes

  • Electronic, Optical and Magnetic Materials
  • Biomaterials
  • Atomic and Molecular Physics, and Optics
  • Radiology Nuclear Medicine and imaging

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  • Cite this

    Lee, H., & Kim, D. (2017). Plasmonic super-localization using nano-post arrays for biomedical spectroscopy. In D. V. Nicolau, D. Fixler, & A. N. Cartwright (Eds.), Nanoscale Imaging, Sensing, and Actuation for Biomedical Applications XIV [100771A] (Progress in Biomedical Optics and Imaging - Proceedings of SPIE; Vol. 10077). SPIE. https://doi.org/10.1117/12.2252505