All-dielectric transformation medium mimicking a broadband converging lens

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

Research output: Contribution to journalArticle

3 Citations (Scopus)

Abstract

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
Volume26
Issue number16
DOIs
StatePublished - Aug 6 2018

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lenses
broadband
vortices
divergence
antenna radiation patterns
channel capacity
microwaves
lens design
Laplace equation
radio waves
wireless communication
far fields
near fields
radio frequencies
manufacturing
angular momentum
degrees of freedom
optics
permittivity
boundary conditions

All Science Journal Classification (ASJC) codes

  • Atomic and Molecular Physics, and Optics

Cite this

Liu, T., Feng, R., Yi, J., Burokur, S. N., Mao, C., Zhang, H., & Werner, D. H. (2018). All-dielectric transformation medium mimicking a broadband converging lens. Optics Express, 26(16), 20331-20341. https://doi.org/10.1364/OE.26.020331
Liu, Tao ; Feng, Rui ; Yi, Jianjia ; Burokur, Shah Nawaz ; Mao, Chunxu ; Zhang, Hailin ; Werner, Douglas Henry. / All-dielectric transformation medium mimicking a broadband converging lens. In: Optics Express. 2018 ; Vol. 26, No. 16. pp. 20331-20341.
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Liu, T, Feng, R, Yi, J, Burokur, SN, Mao, C, Zhang, H & Werner, DH 2018, 'All-dielectric transformation medium mimicking a broadband converging lens', Optics Express, vol. 26, no. 16, pp. 20331-20341. https://doi.org/10.1364/OE.26.020331

All-dielectric transformation medium mimicking a broadband converging lens. / Liu, Tao; Feng, Rui; Yi, Jianjia; Burokur, Shah Nawaz; Mao, Chunxu; Zhang, Hailin; Werner, Douglas Henry.

In: Optics Express, Vol. 26, No. 16, 06.08.2018, p. 20331-20341.

Research output: Contribution to journalArticle

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Liu T, Feng R, Yi J, Burokur SN, Mao C, Zhang H et al. All-dielectric transformation medium mimicking a broadband converging lens. Optics Express. 2018 Aug 6;26(16):20331-20341. https://doi.org/10.1364/OE.26.020331