VO $_2$相变附近振荡偶极子上的光学力
Optical forces on an oscillating dipole near VO$_2$ phase transition
摘要：
我们研究了相变二氧化钒（VO $_2$）薄膜附近的振荡偶极子上的光学力，该薄膜在$340$ K附近具有金属-绝缘体转变和低热滞。这种配置是相关的一个组成的激发的两级量子发射体，我们采用经典的描述来捕捉辐射物质相互作用的重要方面。我们考虑两种不同的配置，即，与平行和垂直于VO $_2$膜的偶极矩的电和磁偶极子。通过使用Bruggeman理论来描述材料的有效光学响应，我们表明，在近场制度，偶极子上的力可以改变从吸引力到排斥力，只是通过加热薄膜为选定的频率范围。我们证明了VO $_2$转变中存在的热滞后清楚地显示在光学力的行为中，为使用相变材料控制光-物质相互作用的替代方法奠定了基础。
英文摘要：
We investigate optical forces on oscillating dipoles close to a phase-change vanadium dioxide (VO$_2$) film, which exhibits a metal-insulator transition around $340$ K and low thermal hysteresis. This configuration is related to one composed of an excited two-level quantum emitter and we employ a classical description to capture important aspects of the radiation-matter interaction. We consider both electric and magnetic dipoles for two different configurations, namely, with the dipole moments parallel and perpendicular to the VO$_2$ film. By using Bruggeman theory to describe the effective optical response of the material, we show that, in the near-field regime, the force on the dipoles can change from attractive to repulsive just by heating the film for a selected frequency range. We demonstrate that the thermal hysteresis present in the VO$_2$ transition clearly shows up in the behavior of the optical forces, setting the grounds for alternative approaches to control light-matter interactions using phase-change materials.
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