Exploring Resonant Optical Manipulation

2016 Fiscal Year Final Research Report

• Project/Area Number: 26288011
• Research Category: Grant-in-Aid for Scientific Research (B)
• Allocation Type: Partial Multi-year Fund
• Section: 一般
• Research Field: Physical chemistry
• Research Institution: Osaka City University
• Principal Investigator: TSUBOI Yasuyuki 大阪市立大学, 大学院理学研究科, 教授 (00283698)
• Research Collaborator: SHOJI Tatsuya 大阪市立大学, 大学院理学研究科, 講師 (90701699)
• Project Period (FY): 2014-04-01 – 2017-03-31
• Keywords: 光ピンセット / 光トラッピング / 輻射圧 / 放射圧 / 共焦点顕微鏡

Outline of Final Research Achievements

In this project, we explored a new optical manipulation. That is, resonant optical trapping where laser light electronically excites a trapping particle. In this resonant excitation condition, electronic polarizability should be much increased and thus optical force enhancement. Based on this concept, we conducted several studies. A representative one is semi-selective optical trapping: we explored plasmonic optical trapping (POT) of nanometer-sized organic crystals, carbocyanine dye aggregates (JC-1). JC-1 dye forms both J- and H- aggregates in aqueous solution. Repeating on-and-off plasmonic excitation resulted in POT of JC-1 aggregates in a trap-and-release mode. Furthermore, interestingly, we found that the J-aggregates were preferentially trapped than H-aggregates. It possibly indicates semi-selective optical trapping of nanoparticles on the basis of molecular alignments.

Free Research Field

マイクロ分析化学、ナノ光学、光マニピュレーション、光化学、レーザー化学、励起状態動力学