Dry launching of silica nanoparticles in vacuum

• URL: http://arxiv.org/abs/2209.00482v1
• Date: Thu, 1 Sep 2022 14:12:13 GMT
• Title: Dry launching of silica nanoparticles in vacuum
• Authors: Ayub Khodaee, Kahan Dare, Aisling Johnson, Uro\v{s} Deli\'c, Markus Aspelmeyer
• Abstract summary: Clean loading of silica nanoparticles with a radius as small as 50 nm is required for experiments in levitated optomechanics that operate in ultra-high vacuum. We present a cheap and simple experimental method for dry launching of silica nanoparticles by shaking from a polytetrafluoroethylene (PTFE) surface.
• Score: 0.0
• License: http://creativecommons.org/licenses/by/4.0/
• Abstract: Clean loading of silica nanoparticles with a radius as small as ~50 nm is required for experiments in levitated optomechanics that operate in ultra-high vacuum. We present a cheap and simple experimental method for dry launching of silica nanoparticles by shaking from a polytetrafluoroethylene (PTFE) surface. We report on the successful launching of single silica nanoparticles with a minimum radius of 43 nm, which is enabled by the low stiction to the launching surface. Nanoparticles with radii of 43 nm and 71.5 nm are launched with a high flux and small angular spread of $\sim \pm 10^\circ$, which allows for trapping in a tightly focused optical tweezer within a couple of minutes. The measured velocities are significantly smaller than 1 m/s. The demonstrated launching method allows for controlled loading of dry nanoparticles with radii as small as 43 nm into optical traps in (ultra-)high vacuum, although we anticipate that loading of smaller sizes is equally feasible.

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