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.
© 2013 Optical Society of America
Original Manuscript: April 8, 2013
Manuscript Accepted: May 21, 2013
Published: June 26, 2013
Rui Yang, Zhenya Lei, Lei Chen, Jiawei Zhang, Zhaoxu Wang, and Yongjun Xie, "Broadband converging plano–concave lens," Opt. Lett. 38, 2311-2313 (2013)