Ultrathin plasmonic quarter waveplate using broken rectangular annular metasurface
Ultrathin plasmonic quarter waveplate using broken rectangular annular metasurface
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DOI：
10.1016/j.optlastec.2017.01.003
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发表时间：
2017-07-01
影响因子：
5
通讯作者：
Wang, Chinhua
中科院分区：
文献类型：
--
作者：
Zhu, Aijiao;Qian, Qinyu;Wang, Chinhua
提出了一种基于亚波长破碎矩形环(BRA)阵列的超薄等离子体亚表面四分之一波片。胸罩结构是由两对垂直取向的狭缝嵌在银膜中形成的。消除了规则矩形环四角的重叠部分，显著增加了局域表面等离子体引起的位相各向异性，从而显著减小了金属膜的厚度，以达到所设计的波片所需的位相差。模拟结果表明，在1.55微米的波长范围内，用厚度为10 nm的银BRA阵列可以得到超薄的四分之一波片，这为推进纳米光子器件的制造提供了巨大的潜力。
We propose an ultrathin plasmonic metasurface-enabled quarter waveplate using a subwavelength broken rectangular annulus (BRA) arrays. The BRA structure is formed by two pairs of slits with perpendicular orientation embedded in a silver thin film. The elimination of the overlapping parts at four corners of a regular rectangular annulus increases significantly the phase anisotropy induced by localized surface plasmons, and thus decreases significantly the thickness of the metal film in order to achieve the required phase difference for a designed waveplate. Simulations show that an ultrathin quarter waveplate can be obtained with a as thin as 10 nm thickness of a silver BRA arrays at wavelength band of 1.55 mu m which provides great potential in advancing manufacture of nanophotonic devices.