Optical nonlinearity enhancement in heterostructures with thick metallic film and truncated photonic crystals.
Optical nonlinearity enhancement in heterostructures with thick metallic film and truncated photonic crystals.
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DOI：
10.1364/ol.34.000578
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发表时间：
2009-03
期刊：
影响因子：
3.6
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
由于块体金属几乎是不透明的，因此很难使用具有高非线性折射率的块体金属。金属-介质光子晶体可以是透明的，但每个金属层处的电场仍然很低。理论上研究了截断型全介质光子晶体与金属厚膜构成的异质结构的非线性响应。由于局域界面模的存在，透射率和金属中的电场都大大增强。与金属-介质光子晶体相比，具有相同金属厚度的异质结构的双稳态阈值强度可降低近2个数量级。
It is hard to use bulk metals with high nonlinear susceptibilities since they are nearly opaque. Metal-dielectric photonic crystals can be transparent, but the electric field at each metal layer is still low. We theoretically studied the nonlinear response of heterostructures composed of truncated all-dielectric photonic crystals and thick metallic films. Because of the localized interface modes, both transmittance and the electric field in the metal are enhanced greatly. Compared to metal-dielectric photonic crystals, the critical intensity of threshold for bistability in the heterostructures with the same thickness of metal can be reduced by nearly 2 orders of magnitude.