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Characteristics and applications of the infrared enhanced transmission of metallic subwavelength arrays.

机译：金属亚波长阵列的红外增强透射的特性和应用。

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Metal films that are periodically patterned exhibit striking optical properties when illuminated with light of wavelength near the periodicity of the film. Nickel mesh with holes spaced by 12.7mum show a higher fractional transmission than the fractional open area of the mesh. This effect is attributed to surface plasmons which allow light incident on one side of the metal mesh to be transmitted to the other side where it is released as light. The majority of surface plasmon studies up to this point have been conducted in the visible and ultraviolet. Due to the hole spacing of this mesh, the surface plasmon phenomenon is seen in the infrared.; Since this work is done in a different region of the electromagnetic spectrum, determining how the surface plasmons behave in this region will aid the overall understanding and help improve the current theories describing surface plasmons. Coating the nickel mesh with other metals allows the effect of the metal on transmission to be studied. In the visible and ultraviolet the metal is predicted to have an impact on the surface plasmons characteristics. Coating the mesh with other metals also closes down the holes so the effect of changing the size of the holes can be studied further aiding in an understanding of the importance of hole size on the surface plasmons.; This increased transmission has been used to study molecular species which are bound to the surface of the mesh. The reaction that converts methanol to formaldehyde has been studied. Due to the unique spectroscopic properties of the mesh, surface species exhibit increased spectroscopic absorptions. The absorptions are enhanced to such an extent that the reactants, products and the adsorbed methoxy radical intermediate have been observed with significant intensity.
机译：当用波长接近薄膜周期性的光照射时，周期性地图案化的金属薄膜会显示出惊人的光学性能。孔距为12.7mm的镍网比网孔的开口率高。该效应归因于表面等离激元，该等离激元使入射在金属网一侧的光透射到另一侧，并在那里以光的形式释放。到目前为止，大多数表面等离子体激元研究都是在可见光和紫外光下进行的。由于该网孔的间距，在红外线中可以看到表面等离子体激元现象。由于这项工作是在电磁波谱的不同区域完成的，因此确定表面等离子体激元在该区域的行为将有助于整体理解并有助于改进描述表面等离子体激元的当前理论。用其他金属涂覆镍网可以研究金属对透射的影响。预计在可见光和紫外线下，金属会对表面等离激元特性产生影响。用其他金属涂覆网孔也可以封闭孔，因此可以进一步研究改变孔尺寸的效果，以帮助理解孔尺寸对表面等离激元的重要性。这种增加的透射率已被用于研究与网孔表面结合的分子种类。已经研究了将甲醇转化为甲醛的反应。由于网片独特的光谱特性，表面物质显示出增加的光谱吸收。吸收增强到一定程度，以致观察到反应物，产物和吸附的甲氧基自由基中间体的强度很高。

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