Ultrafast near-field microscopy of single gold nanoparticles

Kohei Imura, H. Okamoto

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

Abstract

We investigated near-field optical properties and images of single gold nanorods by using a near-field optical microscope. Observed transmission spectra show distinct transverse and longitudinal surface plasmon resonances. Transmission images observed near the surface plasmon resonances agree qualitatively with calculated maps of optical local density-of-states, and are assignable to plasmon wavefunctions. Ultrafast temporal responses in the single gold nanoparticles were observed by combining a near-field microscope with time-resolved techniques. Observed transient transmission images of the single nanorods show characteristic optical features, and are in good agreement with a calculated map of variation of local density of states arising from the elevation of electronic temperature in the nanorod induced by photoexcitation.

Original languageEnglish
Title of host publicationProceedings of SPIE - The International Society for Optical Engineering
Volume6471
DOIs
Publication statusPublished - 2007
Externally publishedYes
EventUltrafast Phenomena in Semiconductors and Nanostructure Materials XI and Semiconductor Photodetectors IV - San Jose, CA
Duration: 2007 Jan 222007 Jan 24

Other

OtherUltrafast Phenomena in Semiconductors and Nanostructure Materials XI and Semiconductor Photodetectors IV
CitySan Jose, CA
Period07/1/2207/1/24

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Keywords

  • Gold nanorod
  • Local density of states
  • Near-field optical microscope
  • Surface plasmon
  • Ultrafast phenomena

ASJC Scopus subject areas

  • Electrical and Electronic Engineering
  • Condensed Matter Physics

Cite this

Imura, K., & Okamoto, H. (2007). Ultrafast near-field microscopy of single gold nanoparticles. In Proceedings of SPIE - The International Society for Optical Engineering (Vol. 6471). [647103] https://doi.org/10.1117/12.696994