Slot-grating flat lens for telecom wavelengths.
Opt Lett
; 39(13): 3786-9, 2014 Jul 01.
Article
em En
| MEDLINE
| ID: mdl-24978737
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.
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MEDLINE
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En
Revista:
Opt Lett
Ano de publicação:
2014
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Article