title: Split-ring-resonator-coupled enhanced transmission through a single subwavelength aperture.
abstract: 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.
authors.affiliation: Department of Physics, Nanotechnology Research Center, and Department of Electrical and Electronics Engineering, Bilkent University, 06800, Ankara, Turkey. aydin@fen.bilkent.edu.tr
authors.forename: Koray
authors.initials: K
authors.lastname: Aydin
authors.forename: A Ozgur
authors.initials: AO
authors.lastname: Cakmak
authors.forename: Levent
authors.initials: L
authors.lastname: Sahin
authors.forename: Z
authors.initials: Z
authors.lastname: Li
authors.forename: Filiberto
authors.initials: F
authors.lastname: Bilotti
authors.forename: Lucio
authors.initials: L
authors.lastname: Vegni
authors.forename: Ekmel
authors.initials: E
authors.lastname: Ozbay