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Optically-levitated dielectric particles can serve as ultra-sensitivedetectors of feeble forces and torques, as tools for use in quantum informationscience, and as a testbed for quantum coherence in macroscopic systems.Knowledge of the structural and optical properties of the particles isimportant for calibrating the sensitivity of such experiments. Here we reportthe results of nanomechanical testing of silica nanospheres and investigate anannealing approach which can produce closer to bulk-like behavior in thesamples in terms of their elastic moduli. These results, combined with ourexperimental investigations of optical trap lifetimes in high vacuum at hightrapping-laser intensity for both annealed and as-grown nanospheres, were usedto provide a theoretical analysis of the effects of porosity and non-sphericityin the samples, identifying possible mechanisms of trapping instabilities fornanospheres with non-bulk-silica-like properties.

Nanomechanical testing of silica nanospheres for levitated optomechanics experiments