[21p-P01-1~11] 3.1 Basic optics and frontier of optics (merged with formerly 3.2 Equipment optics and materials)

[21p-P01-6] Tunable Fluorescence Color from Chains Polymer Trapped by Optical Tweezers Using Black Silicon

〇Hazuki Kusano¹, Ryo Takao¹, Ken-ichi Yuyana¹, Tatsuya Shoji², Yasuyuki Tsuboi¹ (1.Osaka Metropolitan Univ., 2.Kanagawa Univ.)

Keywords:black-silicon, fluorescence microspectroscopy, excimer

We recently developed Nanostructured Semiconductor-Assisted (NASSCA) optical tweezers using Black Silicon (Black-Si). Nano-needles on a surface of Black-Si induces the Mie-resonance and multiple light scattering of an incident laser light, by which strong optical force is generated in the vicinity of the nanostructures. The resultant optical force enables efficient trapping of nano-objects. In this study, we demonstrate optical trapping of polymer chains labelled with perylene or anthracene by NASSCA optical tweezers. We focused near-infrared laser light on the B-Si surface in the sample solution. We observed trapping behaviors by means of fluorescence microspectroscopy. Interestingly, the fluorescence color from the trapped polymer chains changed with time. This fluorescence color change indicated that polymer chains are trapped to be close to each other and accordingly excimer fluorescence is emitted.