Synthesis of High-Purity Solid SiO2 Nanodumbbells via Induced Aggregation
Optically levitated nanodumbbells in vacuum are excellent candidates for thermodynamics, macroscopic quantum mechanics, precision measurements, and quantum sensing. Silica (SiO2) material, with extremely low absorption of near-infrared light and rubust mechanical strength, has been the most potential material for this system. Here we synthesized high-purity solid SiO2 nanodumbbells by introducing acetone for the induced aggregation of SiO2 nanospheres. The nanodumbbells show high uniformity and the sizes are tunable. Previous experimental results demonstrated that the synthetic nanodumbbells can be applied in GHz nanomechanical rotors and can withstand the tensile strength of over 13 GPa. This work engineers a new material platform to advance levitated optomechanics.
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