Zero-reflection metal slabs: A mechanism of light tunneling in metamaterials
Zero-reflection metal slabs: A mechanism of light tunneling in metamaterials
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DOI：
10.1007/s00339-010-6187-x
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发表时间：
2011-06
期刊：
影响因子：
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通讯作者：
G. Du;Haitao Jiang;Zhanshan Wang;Hong Chen
中科院分区：
文献类型：
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作者：
G. Du;Haitao Jiang;Zhanshan Wang;Hong Chen
由于金属的高反射率，厚金属几乎是不透明的，金属巨大的三阶非线性敏感性很难被利用。本文研究了覆盖一维介电光子晶体（PC’s） （CD）n的厚金属(M)板在异质结构M(DC) n和夹层结构（CD）nM(DC)n中的零反射现象。在M（DC）和（CD）nM(DC)nin中，光负介质（金属）与PC配对，在隙区模拟无损光负介质（mu），可以实现可见光隧穿模式。当M = Ag为异质结构，厚度为60.2 nm，夹层结构厚度为83.1 nm时，在波长589 nm处透射率高达33%和38%。后者的透光率是相同厚度的单银层透光率的200倍以上。讨论了在金属基非线性增强和光吸收方面的应用前景。
Thick metals are nearly opaque due to high reflectance and the huge third-order nonlinear susceptibility of metals is hardly utilized. In the present paper, zero-reflection phenomena in a thick metal (M) slab covered with one-dimensional dielectric photonic crystals (PC’s) (CD)nare studied in heterostructures M(DC)nand sandwiched structures (CD)nM(DC)n. Visible-light tunneling modes can be realized in M(DC)nor (CD)nM(DC)nin which the optical epsilon-negative medium (metal) is paired with the PC, which mimics a lossless optical mu-negative medium in the gap region. The transmittance as high as 33% and 38% are observed at wavelength of 589 nm for M = Ag, with thicknessd=60.2 nm in a heterostructure andd=83.1 nm in a sandwiched structure, respectively. The transmittance is more than 200 times larger than that of a single Ag layer with the same thickness in the latter case. Possible applications on metal-based nonlinearity enhancement and optical absorber are also discussed.