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arXiv 2209.11642physics.opticscond-mat.mes-hallquant-ph
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光悬浮纳米粒子与其热像的相互作用:位移传感内部测温

Interaction Between an Optically Levitated Nanoparticle and Its Thermal Image: Internal Thermometry via Displacement Sensing

Thomas Agrenius, Carlos Gonzalez-Ballestero, Patrick Maurer, Oriol Romero-Isart

摘要:

我们提出并从理论上分析了一个实验,其中在表面前的光悬浮纳米颗粒的位移传感可以用来测量纳米颗粒和其热图像之间的诱导偶极-偶极相互作用。这是通过使用对捕获光透明但对红外辐射反射的表面来实现的,其反射率可以被时间调制。这种偶极-偶极相互作用依赖于由二氧化硅纳米颗粒发射的热辐射,其具有足够的时间相干性以使反射的辐射与偶极的热波动相关。所产生的力比热梯度力强几个数量级,并且对于大于两微米的颗粒到表面的距离,它强烈地取决于纳米颗粒的内部温度。我们认为,使用表面前悬浮纳米颗粒的位移传感作为内部温度计在实验上是可行的。实验访问的内部物理的悬浮纳米粒子在真空中是至关重要的理解的限制,退相干造成目前的努力致力于制备纳米粒子在宏观量子叠加态。

英文摘要:

We propose and theoretically analyze an experiment where displacement sensing of an optically levitated nanoparticle in front of a surface can be used to measure the induced dipole-dipole interaction between the nanoparticle and its thermal image. This is achieved by using a surface that is transparent to the trapping light but reflective to infrared radiation, with a reflectivity that can be time modulated. This dipole-dipole interaction relies on the thermal radiation emitted by a silica nanoparticle having sufficient temporal coherence to correlate the reflected radiation with the thermal fluctuations of the dipole. The resulting force is orders of magnitude stronger than the thermal gradient force and it strongly depends on the internal temperature of the nanoparticle for a particle-to-surface distance greater than two micrometers. We argue that it is experimentally feasible to use displacement sensing of a levitated nanoparticle in front of a surface as an internal thermometer. Experimental access to the internal physics of a levitated nanoparticle in vacuum is crucial to understand the limitations that decoherence poses to current efforts devoted to prepare a nanoparticle in a macroscopic quantum superposition state.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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