Efficient optical near-field energy transfer along an Au nanodot coupler with size-dependent resonance |
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Authors: | W Nomura T Yatsui M Ohtsu |
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Institution: | (1) School of Engineering, The University of Tokyo, 7-3-1 Hongo, Bunkyo-ku, Tokyo 113-8656, Japan;(2) Solution-Oriented Research for Science and Technology (SORST), Japan Science and Technology Agency, 687-1 Tsuruma, Machida, Tokyo 194-0004, Japan |
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Abstract: | We confirmed that the light intensity (λ=785 nm) scattered from an isolated hemispherical Au nanoparticle was resonantly enhanced
at a diameter of 200 nm and a height of 50 nm, as observed experimentally using a collection-mode near-field optical microscope.
The experimental results agreed with the calculated results using Mie’s theory. Furthermore, we observed resonant energy transfer
of the optical near-field energy along a chain of Au nanoparticles. The magnitude of the transferred energy increased resonantly
at the size of resonant light scattering for an isolated Au nanoparticle (200 nm diameter with 240 nm center-to-center separation).
PACS 42.82.Et; 73.20.Mf; 78.67.Bf |
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