Split-ring-resonator-coupled enhanced transmission through a single subwavelength aperture.
We report the enhanced transmission of electromagnetic waves through a single subwavelength aperture by using a split-ring resonator (SRR) at microwave frequencies. By placing a single SRR at the near field of the aperture, strongly localized electromagnetic fields are effectively coupled to the aperture with a radius that is 20 times smaller than the resonance wavelength (r/lambda=0.05). We obtained 740-fold transmission enhancement by exciting the electric resonance of SRR. A different coupling mechanism, through the magnetic resonance of SRR, is also verified to lead to enhanced transmission.
Aydin
Koray
K
Department of Physics, Nanotechnology Research Center, and Department of Electrical and Electronics Engineering, Bilkent University, 06800, Ankara, Turkey. aydin@fen.bilkent.edu.tr
Cakmak
A Ozgur
AO
Sahin
Levent
L
Li
Z
Z
Bilotti
Filiberto
F
Vegni
Lucio
L
Ozbay
Ekmel
E