Plasmon-resonant optics for exciting a two photon photochromic reaction or photoluminescence

2014 Fiscal Year Final Research Report

• Project/Area Number: 24656040
• Research Category: Grant-in-Aid for Challenging Exploratory Research
• Allocation Type: Multi-year Fund
• Research Field: Thin film/Surface and interfacial physical properties
• Research Institution: National Institute for Materials Science
• Principal Investigator: MIKI Kazushi 独立行政法人物質・材料研究機構, 高分子材料ユニット, グループリーダー (30354335)
• Co-Investigator(Kenkyū-buntansha): ISOZAKI Katsuhiro 京都大学, 化学研究所, 助教 (30455274)
• Project Period (FY): 2012-04-01 – 2015-03-31
• Keywords: 金属ナノ粒子 / プラズモニクス / 近接場光 / 透明電極 / 非線形光学効果 / 金ナノ粒子 / コアシェル粒子

Outline of Final Research Achievements

Two-dimensional arrays of gold nanoparticles (AuNPs) as localized surface plasmon-resonant (LSPR) optics on a transparent conductive layer of indium-tin-oxide (ITO) were successfully fabricated. By adjusting the LSPR wavelength to 905 nm at peak, two photon photochromic reaction of diarylethene derivative in solution phase was demonstrated with irradiation by an incoherent near-infrared light in the range of 0.017-0.033 W/cm-square instead of a laser, thanks to the AuNP two-dimensional array. Then a series of two-dimensional (2D) arrays of Au-core/Ag-shell nanoparticles with fixed sub-3 nm gap distance was obtained on the ITO substrates. The resulting SERS substrates enhanced Raman signal by up to about 10 to the power of 7 with remarkable spatial uniformity. Our SERS substrate is highly promising as a practical optical devices such as SERS-based sensor substrate or photochemical devices.

Free Research Field

光学、固体物理学、光化学