入射偏振无关的半束腰自旋霍尔效应
Incident-polarization-independent spin Hall effect of light reaching a half beam waist
摘要：
光的自旋霍尔效应，即光在光学界面处的自旋相关横向分裂，本质上是入射偏振敏感现象。最近，已经提出了一种通过均衡两个线偏振的反射系数来消除偏振依赖性的方法，但是仅当束腰充分大于波长时才有效。在这里，我们证明了一个接口，在那里的两个线性偏振的反射系数是相同的，所以是他们的衍生物相对于入射角，支持偏振无关的自旋霍尔位移，即使当束腰是可比的波长。此外，一个各向同性各向异性界面，表现出偏振无关的自旋霍尔位移在整个入射角范围内。蒙特卡罗模拟证明了自旋霍尔位移在任何偏振态下都是简并的，在非偏振入射下达到半个束腰。我们提出了一个应用的束腰尺度自旋霍尔效应的光作为一个可调分束装置，是响应于入射偏振。自旋霍尔位移在任何入射角下都与入射偏振无关，这将有助于广泛的应用，包括实际的自旋相关器件和有源分束器。
英文摘要：
The spin Hall effect of light, a spin-dependent transverse splitting of light at an optical interface, is intrinsically an incident-polarization-sensitive phenomenon. Recently, an approach to eliminate the polarization dependence by equalizing the reflection coefficients of two linear polarizations has been proposed, but is only valid when the beam waist is sufficiently larger than the wavelength. Here, we demonstrate that an interface, at which the reflection coefficients of the two linear polarizations are the same and so are their derivatives with respect to the incident angle, supports the polarization-independent spin Hall shift, even when the beam waist is comparable to the wavelength. In addition, an isotropic-anisotropic interface that exhibits the polarization-independent spin Hall shift over the entire range of incident angles is presented. Monte-Carlo simulations prove that spin Hall shifts are degenerate under any polarization and reaches a half of beam waist under unpolarized incidence. We suggest an application of the beam-waist-scale spin Hall effect of light as a tunable beam-splitting device that is responsive to the incident polarization. The spin Hall shift that is independent of the incident polarization at any incident angle will facilitate a wide range of applications including practical spin-dependent devices and active beam splitters.
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