title: Enhanced mid-infrared transmission through nanoscale metallic coaxial-aperture arrays.
abstract: Using a single interferometric lithography patterning step along with self-aligned pattern-definition techniques, uniform, large-area metallic coaxial arrays with ~ 100-nm toroidal gaps are fabricated. Enhanced (5x) mid-infrared (4 mum) transmission through these sub-wavelength coaxial arrays is observed as compared with that through the same fractional opening area hole arrays as a result of the complex coaxial unit cell. Varying the coaxial dimensions shifts the resonance wavelength and impacts the maximum transmission; design rules are derived. The ability to control the transmission wavelength combined with dramatically enhanced transmission represent a promising path toward nanophotonic applications.
authors.forename: Wenjun
authors.initials: W
authors.lastname: Fan
authors.forename: Shuang
authors.initials: S
authors.lastname: Zhang
authors.forename: K J
authors.initials: KJ
authors.lastname: Malloy
authors.forename: S R J
authors.initials: SR
authors.lastname: Brueck