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) n are studied in heterostructures M(DC) n and sandwiched structures (CD) n M(DC) n . Visible-light tunneling modes can be realized in M(DC) n or (CD) n M(DC) n in 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 thickness d=60.2 nm in a heterostructure and d=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.
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机译：由于高反射率，厚金属几乎是不透明的，几乎没有利用金属的巨大的三阶非线性磁化率。在本文中，研究了异质结构M（DC）中覆盖有一维介电光子晶体（PC's（CD） n 的厚金属（M）平板中的零反射现象。 n 和夹心结构（CD） n M（DC） n 。可见光隧穿模式可以在M（DC） n 或（CD） n M（DC） n 中实现，其中光学ε -阴性介质（金属）与PC配对，该PC模仿了间隙区域中的无损光学mu阴性介质。对于M ＝ Ag，在589nm的波长下观察到高达33％和38％的透射率，在异质结构中的厚度d ＝ 60.2nm，在夹心结构中的d ＝ 83.1nm。透射率比具有相同厚度的单个Ag层的透射率大200倍以上。还讨论了基于金属的非线性增强和光吸收器的可能应用。
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