Resonant microwave transmission through individual subwavelength slits
Resonant microwave transmission through individual subwavelength slits
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通过各个亚波长狭缝的谐振微波传输
DOI：
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发表时间：
2004
期刊：
影响因子：
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通讯作者：
J. Sambles
中科院分区：
文献类型：
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作者：
C. Lawrence;J. Suckling;J. Sambles
已经确定的是，通过金属屏上的一组孔透射的辐射比仅通过孔面积透射的简单计算所预测的要多得多。关于这种增强的传输的确切原因，以及亚波长孔径与亚波长狭缝之间的行为差异，存在着大量的争论。在这项研究中，我们分析了单个狭缝的传输响应，使用微波辐射来确保传输不是由于直接通过金属屏幕本身。在有限长狭缝中，驻波耦合表面等离子体激发产生一组共振透射峰。研究还发现，当狭缝通道的宽度小于100微米时，金属的高但有限的电导率值会影响这种狭缝通道的传输响应。实际上，透射共振频率有强烈的降低，随着狭缝宽度的减小，显著地趋向于零。此外，我们还探讨了组成狭缝的两块金属板的错位效应。这通过改变狭缝端部处的边界条件来修改谐振频率和透射强度。
It is well established that much more radiation may be transmitted through a set of apertures in a metallic screen than a simple calculation from the transmission through the aperture area alone would predict. There has been substantial debate regarding the exact cause of this enhanced transmission, and confusion over the difference between the behaviors of subwavelength apertures as opposed to subwavelength slits. In this study we have analyzed the transmission response of individual slits, using microwave radiation to ensure that transmission is in no part due to direct passage through the metal screen itself. A set of resonant transmission peaks is caused by the excitation of standing-wave-coupled surface plamsons in the finite length slit. It is also found that the high but finite value of the metals’ conductivity influences the transmission response of such slit channels when they are less than 100 microns in width. Indeed there is a strong decrease in transmitted resonant frequency, remarkably tending to zero as the slit width decreases. In addition we have explored the effect of misalignment of the two metal plates that comprise the slit. This modifies resonant frequencies and transmitted intensities through the changing boundary conditions at the slit ends.