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We design and experimentally demonstrate a free-space distance emulator for propagating OAM beams over long distances in a lab environment. The performance of the system is assessed by measuring spot radius and radius of curvature of propagated beams.
In this communication, a half Maxwell fish-eye (HMFE) lens antenna is designed in the 8–11 GHz band using etched planar metamaterials composed of an array of nonresonant square rings with gap (SRG). The refractive index of the HMFE lens can be flexibly obtained in two different ways: one is to adjust the edge length of the SRG unit cell; the other is to change the gap size and the line width of the...
Using beam divergence controlling to mitigate angular error effects in OAM-based FSO links is investigated through simulation and experiment. Results show that controlling beam divergence allows reducing power loss and angular error induced channel crosstalk.
A two-dimensional Luneberg lens designed using a symmetrical metamaterial cell to operate a wide frequency band covering 8GHz–12GHz is proposed and studied. The proposed Luneberg lens is composed of an array of complementary circle cells and embedded in a parallel-plate TEM waveguide. Due to high resonant frequency of the complementary circle cell, the equivalent refractive index is nearly constant...
Based on the theory of semianalytical thermal analysis, temperature and thermal distortion held, additional optical path difference (OPD) and thermal lens within a diode-end-pumped Nd:YAG microchip crystal with back surface cooling were investigated. Expressions of temperature and thermal distortion field, additional OPD and thermal lens were obtained through the analysis on working characteristics...
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