吸光度
红外线的
材料科学
棱镜
折射率
光学
分析化学(期刊)
化学
光电子学
物理
有机化学
作者
Yoshua Albert Darmawan,T. Goto,Taiki Yanagishima,Takao Fuji,Tetsuichi Kudo
标识
DOI:10.1021/acs.jpclett.3c01679
摘要
Recent interest in particle sorting using optical forces has grown due to its ability to separate micro- and nanomaterials based on their optical properties. Here, we present a mid-infrared optical force manipulation technique that enables precise sorting of microspheres based on their molecular vibrational properties using a mid-infrared quantum cascade laser. Utilizing the optical pushing force driven by a 9.3 μm mid-infrared evanescent field generated on a prism through total internal reflection, a variety of microspheres, including those composed of Si–O–Si bonds, can be separated in accordance with their absorbance values at 9.3 μm. The experimental results are in good agreement with the optical force calculations using finite-difference time-domain simulation. Thus, each microsphere’s displacement and velocity can be predicted from the absorbance value; conversely, the optical properties (e.g., absorbance and complex refractive index in the mid-infrared region) of individual microspheres can be estimated by monitoring their velocity.
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