Resonantly overcoming metal opacity
Edmunds, James D.; Lockyear, Matthew J.; Hibbins, Alastair P.; et al.Sambles, J. Roy; Youngs, I.J.
Date: 2013
Journal
Applied Physics Letters
Publisher
American Institute of Physics
Publisher DOI
Abstract
The near-perfect response of electrons in metals to low-frequency electromagnetic fields makes even a sub-skin-depth film almost completely opaque to microwave radiation. Here, it is experimentally demonstrated that by surrounding a ∼60 nm aluminium film with an array of thin resonant cavities, over 35% of the microwave radiation ...
The near-perfect response of electrons in metals to low-frequency electromagnetic fields makes even a sub-skin-depth film almost completely opaque to microwave radiation. Here, it is experimentally demonstrated that by surrounding a ∼60 nm aluminium film with an array of thin resonant cavities, over 35% of the microwave radiation incident can be transmitted over a discrete set of narrow bands. This represents an enhancement of ∼1000 times over an isolated film and allows for a frequency selective screen with a thickness less than 1/70th of the operating wavelength that may be tuned through choice of resonant geometry
Physics and Astronomy
Faculty of Environment, Science and Economy
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