By Topic

Evanescent-to-propagating wave conversion in sub-wavelength metal-strip gratings

Sign In

Cookies must be enabled to login.After enabling cookies , please use refresh or reload or ctrl+f5 on the browser for the login options.

Formats Non-Member Member
$33 $13
Learn how you can qualify for the best price for this item!
Become an IEEE Member or Subscribe to
IEEE Xplore for exclusive pricing!
close button

puzzle piece

IEEE membership options for an individual and IEEE Xplore subscriptions for an organization offer the most affordable access to essential journal articles, conference papers, standards, eBooks, and eLearning courses.

Learn more about:

IEEE membership

IEEE Xplore subscriptions

2 Author(s)
Mohammad Memarian ; The Edward S. Rogers Sr. Dept. Electrical and Computer Engineering, University of Toronto, Toronto, Canada ; George V. Eleftheriades

Transmitting sub-wavelength information to the far-zone is of great interest for various electromagnetics and optics applications, e.g., for overcoming the diffraction limit in imaging or enabling multiple-input/multiple-output operation in closely spaced antennas. The common phenomenon in these applications is the conversion of evanescent to propagating waves. In this paper, we rigorously analyze and study evanescent-to-propagating wave conversion based on sub-wavelength metallic strip gratings. A theory is provided, which fully captures all diffracted fields and clearly highlights this conversion phenomenon. The Green's function of the strip gratings is constructed by introducing the spectral impulse response. This method solves the problem of the aperiodic excitation of the periodic grating and along the way provides insight and clear explanation of the evanescent-to-propagating wave conversion that takes place. All proposed results are validated against full-wave electromagnetic simulations. The theory is used to highlight and explain “extraordinary” transmission through a sub-wavelength metal strip grating when excited by a current source. Finally, an interesting application is presented where a nonradiating arrangement of sources is made to radiate by converting and diffracting its reactive near-field spectrum into the propagating regime using a simple metal strip grating.

Published in:

IEEE Transactions on Microwave Theory and Techniques  (Volume:60 ,  Issue: 12 )