Quarter-Wave Plate Based on Dielectric-Enabled Extraordinary Resonant Transmission
Quarter-Wave Plate Based on Dielectric-Enabled Extraordinary Resonant Transmission
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DOI：
10.1109/lpt.2012.2191399
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发表时间：
2012-06-01
影响因子：
2.6
通讯作者：
Beruete, Miguel
中科院分区：
文献类型：
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作者：
Navarro-Cia, Miguel;Rodriguez-Ulibarri, Pablo;Beruete, Miguel
在理想导体假设下，用解析方法合成了一种基于介质板上双周期亚波长孔阵的紧凑型四分之一波片(QWP)，并对实际金属(铝和银)在太赫兹(THz)和近红外波段进行了数值模拟。这种形式的双折射是通过激发垂直于短面内周期的垂直极化和平行于面内周期的横向磁和横向电异常传输共振来实现的。为了证明该方法的通用性，设计了一个工作在近红外波段的样机，并进行了数值优化。对于0.23 nm厚的太赫兹和0.33 nm厚的近红外原型，通过施加与理想QWP响应+/-10度的最大相位偏差和小于3分贝的轴比，设计的带宽分别为0.6%和0.4%。考虑到设计的简单性，它有望成为紧凑型窄带微波到可见光的偏振设备。
A compact quarter-wave plate (QWP) based on a doubly periodic subwavelength hole array lying over a dielectric slab is synthesized analytically under perfect electric conductor assumption and its validity is demonstrated numerically for real metals (aluminum and silver) at terahertz (THz) and near infrared. The form birefringence is achieved via the excitation of transverse-magnetic and transverse-electric extraordinary transmission resonances for the perpendicular and parallel polarization to the short in-plane period, respectively. To prove the generality of the approach, a prototype working at the near-infrared is designed and numerically optimized. By imposing a maximum phase deviation of +/- 10 degrees from the ideal QWP response and an axial ratio smaller than 3 dB, the bandwidth of the designs are 0.6% and 0.4% for the 0.23-lambda-thick THz and 0.33-lambda-thick near-infrared prototype, respectively. Given the simplicity of the design, it holds promise for compact narrowband microwaves-to-visible polarizing devices.