An apparatus for in-vacuum loading of nanoparticles into an optical trap

• URL: http://arxiv.org/abs/2208.02102v1
• Date: Wed, 3 Aug 2022 14:30:55 GMT
• Title: An apparatus for in-vacuum loading of nanoparticles into an optical trap
• Authors: Evan Weisman, Chethn Krishna Galla, Cris Montoya, Eduardo Alejandro, Jason Lim, Melanie Beck, George P. Winstone, Alexey Grinin, William Eom, Andrew A. Geraci
• Abstract summary: A piezoelectric transducer is used to generate dry aerosols of spherical and high-aspect ratio particles ranging in size by approximately two orders of mangitude. The device has been shown to generate accelerations of order $107$ $g$, which is sufficient to overcome stiction forces between glass nanoparticles and a glass substrate. We report the velocity distribution of the particles launched from the substrate and our results indicate promise for direct loading into ultra-high-vacuum with sufficient laser feedback cooling.
• Score: 0.0
• License: http://creativecommons.org/licenses/by/4.0/
• Abstract: We describe the design, construction, and operation of an apparatus utilizing a piezoelectric transducer for in-vacuum loading of nanoparticles into an optical trap for use in levitated optomechanics experiments. In contrast to commonly used nebulizer-based trap-loading methods which generate aerosolized liquid droplets containing nanoparticles, the method produces dry aerosols of both spherical and high-aspect ratio particles ranging in size by approximately two orders of mangitude. The device has been shown to generate accelerations of order $10^7$ $g$, which is sufficient to overcome stiction forces between glass nanoparticles and a glass substrate for particles as small as $170$ nm diameter. Particles with sizes ranging from $170$ nm to $\sim 10$ $\mu$m have been successfully loaded into optical traps at pressures ranging from $1$ bar to $0.6$ mbar. We report the velocity distribution of the particles launched from the substrate and our results indicate promise for direct loading into ultra-high-vacuum with sufficient laser feedback cooling. This loading technique could be useful for the development of compact fieldable sensors based on optically levitated nanoparticles as well as matter-wave interference experiments with ultra-cold nano-objects which rely on multiple repeated free-fall measurements and thus require rapid trap re-loading in high vacuum conditions.

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