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用倒置的共焦-激光镊-拉曼谱仪系统,测量了悬浮在液体中的单光学捕陷的高折射率和非透明微粒子的拉曼光谱。用低功率TEM00模的二极管激光束,既做光学捕陷,又做具有折射、吸收和反射的金属微粒的拉曼激发。为对不透明微粒形成稳定的捕陷,把光束聚焦在近粒子的顶部,并通过轴向推斥力将粒子推向背面的玻璃板。记录了具有高折射率的微米尺寸单晶,如硅、锗和KNbO3的拉曼光谱,以及黑色和彩色涂料吸收粒子的拉曼光谱,还展示了捕陷银粒子簇表面吸收的若丹明6G和苯基丙氨酸分子表面增强拉曼散射。
Using an inverted confocal-laser tweezers-Raman spectrometer system, the single-optically trapped high refractive index and Raman spectra of non-transparent particles suspended in a liquid were measured. With a low power TEM00 mode diode laser beam, both as an optical trap, but also have refraction, absorption and reflection of Raman excitation metal particles. In order to form a stable trap on the opaque particles, the beam is focused on the top of the proximate particles and pushed by the axial repulsion force towards the backside glass plate. The Raman spectra of micron-sized single crystals with high refractive index, such as silicon, germanium and KNbO3, as well as the Raman spectra of the absorbing particles of black and color coatings were also recorded, along with rhodamine 6G absorbed on the surface of the trapped silver particle clusters And phenylalanine surface enhanced Raman scattering.