School of Engineering and Applied Sciences, Harvard University , Cambridge, Massachusetts 02138, United States.
Nano Lett. 2013 Sep 11;13(9):4269-74. doi: 10.1021/nl402039y. Epub 2013 Aug 9.
We report a new type of holographic interface, which is able to manipulate the three fundamental properties of light (phase, amplitude, and polarization) over a broad wavelength range. The design strategy relies on replacing the large openings of conventional holograms by arrays of subwavelength apertures, oriented to locally select a particular state of polarization. The resulting optical element can therefore be viewed as the superposition of two independent structures with very different length scales, that is, a hologram with each of its apertures filled with nanoscale openings to only transmit a desired state of polarization. As an implementation, we fabricated a nanostructured holographic plate that can generate radially polarized optical beams from circularly polarized incident light, and we demonstrated that it can operate over a broad range of wavelengths. The ability of a single holographic interface to simultaneously shape the amplitude, phase, and polarization of light can find widespread applications in photonics.
我们报告了一种新型全息接口，它能够在宽波长范围内操控光的三个基本属性（相位、幅度和偏振）。该设计策略依赖于用亚波长孔径阵列替代传统全息图的大开口，以局部选择特定的偏振状态。因此，所得到的光学元件可以被视为两个具有非常不同长度尺度的独立结构的叠加，即，每个孔都填充有纳米尺度开口的全息图，仅传输期望的偏振状态。作为一种实现方式，我们制造了一种纳米结构的全息板，它可以将圆偏振入射光转换为径向偏振光束，并且我们证明它可以在很宽的波长范围内工作。单个全息接口同时对光的幅度、相位和偏振进行整形的能力在光子学中有广泛的应用。
