Highly-efficient two-photon reaction processes using entanglement of localized plasmons

2014 Fiscal Year Final Research Report

• Project/Area Number: 23246016
• Research Category: Grant-in-Aid for Scientific Research (A)
• Allocation Type: Single-year Grants
• Section: 一般
• Research Field: Applied optics/Quantum optical engineering
• Research Institution: Hokkaido University
• Principal Investigator: SASAKI Keiji 北海道大学, 電子科学研究所, 教授 (00183822)
• Co-Investigator(Renkei-kenkyūsha): FUJIWARA Hideki 北海道大学, 電子科学研究所, 准教授 (10374670) ; TANAKA Yoshito 北海道大学, 電子科学研究所, 博士研究員 (50533733)
• Project Period (FY): 2011-04-01 – 2015-03-31
• Keywords: 光プロセシング / 微小球共振器 / 顕微分光ｲﾒｰｼﾞﾝｸﾞ / 金属ﾅﾉ構造体 / 光局在 / 光反応増強

Outline of Final Research Achievements

Utilizing the synergistic effect of the plasmonic enhancement and temporal entangled photons in plasmonic metal nanostructures, we have developed elemental technologies for the realization of highly-efficient two-photon reaction process. We performed theoretical evaluations of enhanced electric fields and found that further electric field enhancement could be expected by the periodic array of gold nano-gap structures. Then, we experimentally examined that two-photon excited fluorescence was enhanced by at least 5 order of magnitude in the periodic gold nanostructure. Furthermore, using a tapered-fiber coupled microsphere, we also developed a plasmonic-photonic hybrid system for highly-efficient plasmon excitation, which can focus an incident light to a small gold nanostructure with 100% efficiency. To experimentally verify the efficient plasmon excitation, we succeeded in the observation of SHG and two-photon excited fluorescence under a weak CW excitation (a few kW/cm2).

Free Research Field

工学