Abstract
We report a photophoretic assembly of two-dimensional (2D) crystals from microparticle suspensions. The assembly of microparticles is based on the negative photophoresis induced by a 1550 nm laser beam from a cleaved single-mode fiber. The influence of particle size and laser power on the assembly was experimentally investigated and the photophoresis behavior was analyzed by using a finite-difference time-domain simulation. The results indicate that larger particle diameter or higher laser power will lead to higher assembly speed. Moreover, the diffraction property of the assembled 2D crystals was tested with the assistance of 632.8 nm red light and 532 nm green light, which confirmed that the assembled 2D crystals exhibit hexagonal-close-packed lattice orientation.
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