Optical cold damping of neutral nanoparticles near the ground state in an optical lattice

Author:

Kamba Mitsuyoshi1,Shimizu Ryoga1,Aikawa Kiyotaka1

Affiliation:

1. Tokyo Institute of Technology

Abstract

We propose and demonstrate purely optical feedback cooling of neutral nanoparticles in an optical lattice to an occupation number of 0.85 ± 0.20. The cooling force is derived from the optical gradients of displaced optical lattices produced with two sidebands on the trapping laser. To achieve highly accurate position observations required for cooling near the ground state, we reduce the laser intensity noise to a relative power noise of 6×10−8/Hz in a frequency band of 30 kHz to 600 kHz. We establish a reproducible method for neutralizing nanoparticles at high vacuum via a combination of discharging and irradiating an ultraviolet light. Our results form an important basis for the investigation of quantum mechanical properties of ultracold nanoparticles and are also useful for precision measurements with neutral nanoparticles.

Funder

Co-creation place formation support program

Precursory Research for Embryonic Science and Technology

Research Foundation for Opto-Science and Technology

Tokyo Institute of Technology

Mitsubishi Foundation

Murata Science Foundation

Japan Society for the Promotion of Science

Publisher

Optica Publishing Group

Subject

Atomic and Molecular Physics, and Optics

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