论文标题
基于可见范围内双重的超材料的半波板
Half-wave plate based on a birefringent metamaterial in the visible range
论文作者
论文摘要
在目前的论文中，基于双发性分离的半波板（HWP）在数值上设计用于在可见范围内运行。所提出的结构由一系列垂直矩形孔（RAA）组成，这些矩形孔（RAA）刻在沉积在玻璃基板上的不透明银膜中。孔之一是玻璃。该板的工作原理基于每个光圈内的一个引导模式的激发和传播，但具有不同的有效索引。在输出侧，获得了一个相位差，其值主要取决于金属厚度。我们已经根据有限差的时间域方法研究了最简单的配置，以设计具有优化效率的半板，从而在737 nm的操作波长下，双折射系数超过$ 60 \％$，并以$ 2.1 $。这种各向异性跨表面有望在集成光子学中进行广泛的应用。
In the present paper, a half-wave plate (HWP) based on a birefringent metamaterial is numerically designed to operate in the visible range. The proposed structure consists of an array of double-pattern perpendicular rectangular aperture (RAA) engraved into opaque silver film deposited on a glass substrate. One of the apertures is glass filled. The operating principle of this plate is based on the excitation and the propagation of one guided mode inside each aperture but with different effective index. At the output side, a phase difference is obtained whose value mainly depends on the metal thickness. We have investigated the most simplest configurations using a homemade code based on the finite difference time domain method to design a half-plate with optimized efficiency resulting in transmission coefficient of more than $60\%$ together with a birefringence of $2.1$ at an operation wavelength of 737 nm. This kind of anisotropic metasurface promises a wide range of applications in integrated photonics.
