Resonant microwave transmission through individual subwavelength slits

Chris R. Lawrence; James R. Suckling; John Roy Sambles

doi:10.1117/12.582000

30 November 2004 Resonant microwave transmission through individual subwavelength slits

Chris R. Lawrence, James R. Suckling, John Roy Sambles

Proceedings Volume 5618, Integrated Optical Devices, Nanostructures, and Displays; (2004) https://doi.org/10.1117/12.582000
Event: European Symposium on Optics and Photonics for Defence and Security, 2004, London, United Kingdom

Abstract

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.

Citation Download Citation

Chris R. Lawrence, James R. Suckling, and John Roy Sambles "Resonant microwave transmission through individual subwavelength slits", Proc. SPIE 5618, Integrated Optical Devices, Nanostructures, and Displays, (30 November 2004); https://doi.org/10.1117/12.582000

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