title: Slot-grating flat lens for telecom wavelengths.
abstract: We present a stand-alone beam-focusing flat lens for use in the telecommunications wavelength range. Light incident on the back surface of the lens propagates through a subwavelength aperture and is heavily diffracted on exit and partially couples into a surface plasmon polariton and a surface wave propagating along the surface of the lens. Interference between the diffracted wave and re-emission from a grating patterned on the surface produces a highly collimated beam. We show for the first time a geometry at which a lens of this type can be used at telecommunication wavelengths (λ=1.55 μm) and identify the light coupling and re-emission mechanisms involved. Measured beam profile results at varying incident wavelengths show excellent agreement with Lumerical FDTD simulation results.
authors: Jonathan R
authors: JR
authors: Pugh
authors: Jamie L
authors: JL
authors: Stokes
authors: Martin
authors: M
authors: Lopez-Garcia
authors: Choon-How
authors: CH
authors: Gan
authors: Geoff R
authors: GR
authors: Nash
authors: John G
authors: JG
authors: Rarity
authors: Martin J
authors: MJ
authors: Cryan