Slot-grating flat lens for telecom wavelengths

Jonathan R Pugh, Jamie L Stokes, Martin Lopez-Garcia, Choon-How Gan, Geoff R Nash, John G Rarity, Martin J Cryan, Martin Lopez Garcia

Research output: Contribution to journalArticle (Academic Journal)peer-review

1 Citation (Scopus)


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 (lambda = 1.55 mu m) 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. (C) 2014 Optical Society of America

Original languageEnglish
Pages (from-to)3786-3789
Number of pages4
JournalOptics Letters
Issue number13
Publication statusPublished - 1 Jul 2014

Structured keywords

  • QETLabs
  • Photonics and Quantum




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