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Nanoscale uniformity in the active tuning of a plasmonic array by polymer gel volume change

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Title: Nanoscale uniformity in the active tuning of a plasmonic array by polymer gel volume change
Authors: Hamajima, Satoru Browse this author
Mitomo, Hideyuki Browse this author →KAKEN DB
Tani, Takeharu Browse this author
Matsuo, Yasutaka Browse this author →KAKEN DB
Niikura, Kenichi Browse this author
Naya, Masayuki Browse this author
Ijiro, Kuniharu Browse this author →KAKEN DB
Issue Date: 1-May-2019
Publisher: Royal Society of Chemistry
Journal Title: Nanoscale advances
Volume: 1
Issue: 5
Start Page: 1731
End Page: 1739
Publisher DOI: 10.1039/c8na00404h
Abstract: Active plasmonic tuning is an attractive but challenging research subject, leading to various promising applications. As one of the approaches, nanostructures are placed in or on soft matter, such as elastomers and gels, and their gap distances are tuned by the mechanical extension or volume change of the supporting matrices. As hydrogels possess various types of stimuli- responsiveness with large volume change and biocompatibility, they are good candidates as supporting materials for active nanostructure tuning. However, it remains unclear how accurately we can control their nanogap distance changes using polymer gels with a low deviation due to major difficulties in the precise observation of nanostructures on the gels. Here, we prepared gold arrays with sub- 100 nm dots on silicon substrates by electron beam lithography and transferred them onto the hydrogel surface. Then, their nanopattern was actively tuned by the changes in gel size in water and their structural changes were confirmed by optical microscopy, microspectroscopy, and atomic force microscopy ( AFM). Further, we successfully prepared ionic liquid ( IL) gels with various degrees of swelling via solvent exchange. Scanning electron microscopy ( SEM) observation of the IL gels provided clear pictures at nanoscale resolution. Finally, we calculated the plasmonic spectra using a finite difference time domain ( FDTD) simulation based on the SEM images and compared them with the measured spectra. The results in this study totally support the notion that active changes in plasmonic nanodot patterns via volume changes in the hydrogel are quite homogenous on a several nanometer scale, making them ideal for precise active surface plasmon tuning.
Rights: http://creativecommons.org/licenses/by/3.0/
Type: article
URI: http://hdl.handle.net/2115/76124
Appears in Collections:電子科学研究所 (Research Institute for Electronic Science) > 雑誌発表論文等 (Peer-reviewed Journal Articles, etc)

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