Optical control over transmission of terahertz radiation through arrays of subwavelength holes of varying size
Isaac, Thomas Henry; Gómez Rivas, J.; Hendry, Euan
Date: 25 November 2009
Article
Journal
Physical Review B
Publisher
American Physical Society
Publisher DOI
Abstract
We modulate the transmission of terahertz (THz) radiation through periodic arrays of subwavelength holes in a metallic film by using pulses of visible-wavelength light to photoexcite the semiconducting substrate of the hole arrays. By varying the photodoping level of the semiconductor we are able to switch off the resonant transmission ...
We modulate the transmission of terahertz (THz) radiation through periodic arrays of subwavelength holes in a metallic film by using pulses of visible-wavelength light to photoexcite the semiconducting substrate of the hole arrays. By varying the photodoping level of the semiconductor we are able to switch off the resonant transmission of THz radiation through the array. By varying the size of the holes, we demonstrate the crucial role that surface modes play in the resonant transmission and ultimately in the photomodulation behavior of these structures. We demonstrate that the surface-wave transmission mechanism can allow for very efficient optical modulation of radiation transmission.
Physics and Astronomy
Faculty of Environment, Science and Economy
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