材料科学
激光冷却
激光器
波长
米氏散射
光电子学
介观物理学
光学
功率密度
激光功率缩放
光散射
散射
功率(物理)
物理
凝聚态物理
量子力学
作者
Galina Nemova,Christophe Caloz
标识
DOI:10.1364/iprsn.2021.iw4a.3
摘要
Laser cooling of solids with anti-Stokes fluorescence is currently attracting widespread attention because of the wide range of its applications, including all-optical cryocooling for airborne and space-based applications, heat suppression in high-power lasers, and cooling of nanoparticles for biological and mesoscopic physics. This laser cooling process has typically very low (only a few%) efficiency and its enhancement is therefore highly desirable. In this work, we propose to leverage Mie resonance to enhance anti-Stokes fluorescence cooling in RE-doped nanoparticles. As an example, we consider an Yb 3+ :YAG nanosphere pumped at the long wavelength tail of the Yb 3+ absorption spectrum, at 1030 nm. We show that if the radius of the nanosphere is adjusted to the pump wavelength in such a manner that the pump excites some of the Mie resonant modes of the sample, the cooling power density generated in the sample is considerably enhanced and the temperature of the sample is consequently appreciably decreased.
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