[19p-B203-1~19] 3.1 Basic optics and frontier of optics

[19p-B203-18] Spatiotemporal Control of Radiation Pressure by Using T-type Photochromic Reactions

〇Kenji Setoura¹, Ahsan Memon¹, Syoji Ito¹, Yuki Inagaki², Katsuya Mutoh², Jiro Abe², Hiroshi Miyasaka¹ (1.Osaka Univ., 2.Aoyama Gakuin Univ.)

Keywords:optical trapping, absorption force, photochromic compounds

Optical forces acting on microparticles trapped by optical tweezers can be divided into three terms: gradient force, scattering force, and absorption force. Switching of optical absorption bands through photochromic reactions generates absorption force onto the trapped microparticles, which introduces a new strategy into optical manipulation techniques. In the present study, we employed naphthopyran derivatives as a photochromic compound. In the experiment, polymer microparticles with diameters of 7 mm incorporating photochromic compounds were optically trapped by a focused CW laser beam. When the trapped microparticle was irradiated with UV light, the microparticle was pushed along the axis of light propagation about a few micrometers by absorption force. The present results indicate that spatiotemporal control of radiation force is possible by utilizing the photochromic reactions.