Bulletin of the Chemical Society of Japan
Online ISSN : 1348-0634
Print ISSN : 0009-2673
ISSN-L : 0009-2673
The Chemical Society of Japan Award for Young Chemists for 2010
Fabrication of Nanoengineered Metallic Structures and Their Application to Nonlinear Photochemical Reactions
Kosei UenoHiroaki Misawa
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2012 Volume 85 Issue 8 Pages 843-853

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Abstract

We used metallic nanoparticles exhibiting localized surface plasmon resonance and electromagnetic (EM) field enhancement effects induced by plasmon excitation for the photochemical reaction field; this approach makes it possible to increase the probability of an interaction between photons and the materials. EM field enhancement effects induced by gold nanostructures were elucidated using two-photon-induced photoluminescence from nanogap-spaced gold nanoparticles. The photoluminescence was promoted mainly in the surface regions of the gold nanoblocks adjacent to the nanogaps due to the EM field enhancement effect. To elucidate the near-field intensity distribution of the nanogap gold structures, we investigated the photopolymerization of a commercially available negative photoresist assisted by EM field enhancement in the nanogaps separating the gold nanoblocks. Photopolymerization rates were enhanced by several orders of magnitude in the gold nanoblock structures that contained nanogaps narrower than 10 nm. We propose two surface plasmon-assisted nanolithography techniques based on spatially selective photochemical reactions promoted by the EM field enhancement effect. The first method uses ultimate near-field lithography with a local near-field distribution induced in the nanogaps, and the second technique uses the scattering component of multipole plasmon resonance as an exposure mechanism. These lithographic techniques represent a type of application based on plasmon-enhanced chemical reactions.

Metallic nanoparticles showing localized surface plasmon resonances were used for photochemical reaction field. To elucidate plasmon-enhanced photochemical reaction, we pursued nonlinear photopolymerization of a commercially available negative photoresist assisted by electromagnetic field enhancement, and successfully applied this principle to nanolithography. Fullsize Image
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© 2012 The Chemical Society of Japan
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