We propose and demonstrate numerically, through time-domain simulations of Maxwell’s equations, a method to generate an oscillatory radiation torque of pN ⋅ μ m strength and sub-picosecond period of oscillation. The approach is based on the change of light’s instantaneous angular momentum as it resonantly excites a micro-cylindrical rod possessing an azimuthally varying continuous refractive index profile. The torque amplitude and its oscillation period can be controlled by a proper change in the rod’s size and in light’s frequency and electric field amplitude.

中文翻译：

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太赫兹的太赫兹振荡辐射扭矩

我们通过麦克斯韦方程组的时域仿真，提出并通过数值方法论证了一种生成强度为pN⋅μm的振动辐射扭矩和亚皮秒振动周期的方法。该方法基于光的瞬时角动量的变化，因为它会共振激发具有方位角变化的连续折射率分布的微圆柱棒。扭矩幅度及其振荡周期可以通过适当改变杆的大小以及光的频率和电场幅度来控制。