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Opt Lett. 2005 Nov 1;30(21):2945-7.

Resonant terahertz transmission in subwavelength metallic hole arrays of sub-skin-depth thickness.

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  • 1School of Electrical and Computer Engineering, Oklahoma State University, Stillwater, Oklahoma 74078, USA.


We study surface-plasmon-enhanced terahertz transmission through subwavelength metallic hole arrays of sub-skin-depth thickness. Dynamic evolution of surface-plasmon resonance in terms of array thickness is characterized by use of terahertz time-domain spectroscopy in the frequency range 0.1-4.5 THz. A critical thickness of lead array film is observed, above which surface-plasmon coupling of terahertz pulses begins and is enhanced rapidly as the array thickness is increased toward the skin depth. The experimental results indicate that high-efficiency extraordinary terahertz transmission can be achieved at an array thickness of only one third of skin depth.

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