Optical cold damping of neutral nanoparticles near the ground state in an optical lattice
Optical cold damping of neutral nanoparticles near the ground state in an optical lattice
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DOI：
10.1364/oe.462921
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发表时间：
2022-07-18
期刊：
影响因子：
3.8
通讯作者：
Aikawa, Kiyotaka
中科院分区：
文献类型：
--
作者：
Kamba, Mitsuyoshi;Shimizu, Ryoga;Aikawa, Kiyotaka
我们提出并演示了光学晶格中中性纳米粒子的纯光学反馈冷却，占据数为 0.85 +/- 0.20。冷却力源自捕获激光器上两个边带产生的移位光学晶格的光学梯度。为了实现接近基态冷却所需的高精度位置观测，我们在30 kHz至600 kHz频带内将激光强度噪声降低至6x10(-8)/Hz的相对功率噪声。我们建立了一种可重复的方法，通过结合放电和照射紫外线在高真空下中和纳米颗粒。我们的结果为研究超冷纳米粒子的量子力学性质奠定了重要基础，也可用于中性纳米粒子的精确测量。 (C) 2022 Optica Publishing Group 根据 Optica 开放获取出版协议的条款
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 6x10(-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. (C) 2022 Optica Publishing Group under the terms of the Optica Open Access Publishing Agreement