Broadband converging plano-concave lens.
Opt Lett
; 38(13): 2311-3, 2013 Jul 01.
Article
en En
| MEDLINE
| ID: mdl-23811912
ABSTRACT
A plano-concave lens with source-tailored geometric profile and transformational gradient index is proposed for broadband illumination. Such a design, capable of focusing and collimating the electromagnetic fields, fulfils the functionality of a converging lens and can also achieve a steerable beam and multiple beams efficiently. Nonresonant synthesis with a perforated dielectric plate and dielectric rod arrays is demonstrated for the lensing realization, promising a wide operating frequency band in the practical implementation.
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2013
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Article