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

Toshiyuki Honda, Mitsuhiro Terakawa, Minoru Obara

研究成果: Conference contribution

抄録

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.

本文言語English
ホスト出版物のタイトルComplex Light and Optical Forces VI
DOI
出版ステータスPublished - 2012
イベントComplex Light and Optical Forces VI - San Francisco, CA, United States
継続期間: 2012 1月 252012 1月 26

出版物シリーズ

名前Proceedings of SPIE - The International Society for Optical Engineering
8274
ISSN(印刷版)0277-786X

Other

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

ASJC Scopus subject areas

  • 電子材料、光学材料、および磁性材料
  • 凝縮系物理学
  • コンピュータ サイエンスの応用
  • 応用数学
  • 電子工学および電気工学

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