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 language | English (US) |
|---|---|
| Pages (from-to) | 20331-20341 |
| Number of pages | 11 |
| Journal | Optics Express |
| Volume | 26 |
| Issue number | 16 |
| DOIs | |
| State | Published - Aug 6 2018 |
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All Science Journal Classification (ASJC) codes
- Atomic and Molecular Physics, and Optics
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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 journal › Article
TY - JOUR
T1 - All-dielectric transformation medium mimicking a broadband converging lens
AU - Liu, Tao
AU - Feng, Rui
AU - Yi, Jianjia
AU - Burokur, Shah Nawaz
AU - Mao, Chunxu
AU - Zhang, Hailin
AU - Werner, Douglas Henry
PY - 2018/8/6
Y1 - 2018/8/6
N2 - 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.
AB - 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.
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UR - http://www.scopus.com/inward/citedby.url?scp=85051059875&partnerID=8YFLogxK
U2 - 10.1364/OE.26.020331
DO - 10.1364/OE.26.020331
M3 - Article
C2 - 30119344
AN - SCOPUS:85051059875
VL - 26
SP - 20331
EP - 20341
JO - Optics Express
JF - Optics Express
SN - 1094-4087
IS - 16
ER -