Enhanced near-field properties of a gap of TiO 2 nanosphere pairs for 3D photocatalytic optical trap

Toshiyuki Honda, Mitsuhiro Terakawa, Minoru Obara

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

Abstract

Localized near field on a nanostructure has been attracting much attention for a template for size-selective optical trapping beyond the diffraction limit. The near-field optical trapping has mainly been studied by using metallic substrates such as Au nanodot pairs, periodic Al nanoslits, and nanoapertures in an Au film. In this paper, we newly design a Miescattered near-field optical trapping scheme for size-selective photocatalysis by using pairs of poly-rutile TiO 2 nanospheres. The optical intensity distribution in a gap between the nanospheres was simulated by a FDTD (Finite- Difference Time-Domain) method. The simulation system consists of two nanospheres of 240 nm in diameter placed on a silica substrate in water. The 400 nm excitation laser is used for both the near-field generation and the photocatalyst pumping. The optical force for the trapping was calculated based on the near-field intensity distribution. The results suggest that the optical force generated by the proposed system is sufficient for near-field optical trapping which provides size-selective photocatalysis for killing virus, etc.

Original languageEnglish
Title of host publicationComplex Light and Optical Forces VI
DOIs
Publication statusPublished - 2012 Mar 2
EventComplex Light and Optical Forces VI - San Francisco, CA, United States
Duration: 2012 Jan 252012 Jan 26

Publication series

NameProceedings of SPIE - The International Society for Optical Engineering
Volume8274
ISSN (Print)0277-786X

Other

OtherComplex Light and Optical Forces VI
CountryUnited States
CitySan Francisco, CA
Period12/1/2512/1/26

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Keywords

  • Near field
  • Optical trapping
  • Size-selective photocatalysis
  • TiO

ASJC Scopus subject areas

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

Cite this

Honda, T., Terakawa, M., & Obara, M. (2012). Enhanced near-field properties of a gap of TiO 2 nanosphere pairs for 3D photocatalytic optical trap. In Complex Light and Optical Forces VI [82740Z] (Proceedings of SPIE - The International Society for Optical Engineering; Vol. 8274). https://doi.org/10.1117/12.907207