Enhanced near-field properties of a gap of TiO2 nanosphere pairs for 3D photocatalytic optical trap

Toshiyuki Honda; Mitsuhiro Terakawa; Minoru Obara

doi:10.1117/12.907207

13 February 2012 Enhanced near-field properties of a gap of TiO₂ nanosphere pairs for 3D photocatalytic optical trap

Toshiyuki Honda, Mitsuhiro Terakawa, Minoru Obara

Proceedings Volume 8274, Complex Light and Optical Forces VI; 82740Z (2012) https://doi.org/10.1117/12.907207
Event: SPIE OPTO, 2012, San Francisco, California, United States

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 TiO₂ 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.

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Toshiyuki Honda, Mitsuhiro Terakawa, and Minoru Obara "Enhanced near-field properties of a gap of TiO₂ nanosphere pairs for 3D photocatalytic optical trap", Proc. SPIE 8274, Complex Light and Optical Forces VI, 82740Z (13 February 2012); https://doi.org/10.1117/12.907207

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KEYWORDS

Near field optics

Near field

Optical spheres

Optical tweezers

Titanium dioxide

Nanostructures

Silica

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