All-dielectric transformation medium mimicking a broadband converging lens

Tao Liu, Rui Feng, Jianjia Yi, Shah Nawaz Burokur, Chunxu Mao, Hailin Zhang, Douglas H. Werner

Research output: Contribution to journalArticlepeer-review

17 Scopus citations


Radio waves carrying orbital angular momentum (OAM) may potentially increase spectrum efficiency and channel capacity based on their extra rotational degree of freedom. However, due to their divergence characteristics, vortex waves are not suitable to transmit over a long distance in the radio frequency (RF) and microwave domains. In this paper, a transformation optics (TO) based all-dielectric converging lens is proposed. The beam divergence angle of the vortex wave passing through the lens can be decreased from 25 to 9. The transformed material parameters of the converging lens are determined by solving Laplace’s equation subject to specific boundary conditions. Far-field antenna radiation patterns as well as near-field helical phase and electric field amplitude distributions obtained from numerical simulations are reported, demonstrating the broadband characteristics of the proposed microwave lens. Moreover, the all-dielectric compact lens design comprised by a graded permittivity profile can be fabricated by additive manufacturing technology, which greatly facilitates the potential development and application of vortex wave based wireless communications.

Original languageEnglish (US)
Pages (from-to)20331-20341
Number of pages11
JournalOptics Express
Issue number16
StatePublished - Aug 6 2018

All Science Journal Classification (ASJC) codes

  • Atomic and Molecular Physics, and Optics


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