Papers by Bakhtiyar Orazbayev
2016 IEEE International Symposium on Antennas and Propagation (APSURSI), 2016
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2016 Global Symposium on Millimeter Waves (GSMM) & ESA Workshop on Millimetre-Wave Technology and Applications, 2016
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Advanced Optical Materials, 2016
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2015 40th International Conference on Infrared, Millimeter, and Terahertz waves (IRMMW-THz), 2015
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2015 40th International Conference on Infrared, Millimeter, and Terahertz waves (IRMMW-THz), 2015
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2015 USNC-URSI Radio Science Meeting (Joint with AP-S Symposium), 2015
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A diffractive lens derived from a fishnet metamaterial lens is designed to reduce the volume of t... more A diffractive lens derived from a fishnet metamaterial lens is designed to reduce the volume of the element 60% while keeping the properties unaltered. The all-metallic self-supporting diffractive optical element operates at 56.7 GHz (wavelength = 5.29 mm) in the negative near-zero refractive index regime, has an experimental focal length of 46.5 mm, and its focus has a subwavelength transverse resolution (0.67Lambda ) and depth of focus 3.24Lambda . When the zoned lens is used to collimate the radiation pattern of an open-ended rectangular waveguide, a gain of around 12.26 dB is achieved.
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An epsilon-near zero (ENZ) plano-concave lens is designed, numerically studied and experimentally... more An epsilon-near zero (ENZ) plano-concave lens is designed, numerically studied and experimentally demonstrated at millimeter-waves. The metallic lens is synthesized by an array of stacked narrow hollow rectangular waveguides working near cutoff emulating an ENZ medium. At the working frequency (fo = 144 GHz, λ0 = 2.08 mm) the focusing properties of the lens demonstrate an experimental transmission power enhancement of 15.9 dB with a good impedance matching with free space.
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Physical Review B, 2015
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IEEE Transactions on Antennas and Propagation, 2015
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Proceedings of 2014 Mediterranean Microwave Symposium (MMS2014), 2014
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Optics Express, 2015
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2014 USNC-URSI Radio Science Meeting (Joint with AP-S Symposium), 2014
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Applied Physics Letters, 2014
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2014 8th International Congress on Advanced Electromagnetic Materials in Microwaves and Optics, 2014
ABSTRACT An epsilon-near zero (ENZ) plano-concave lens is designed, numerically studied and exper... more ABSTRACT An epsilon-near zero (ENZ) plano-concave lens is designed, numerically studied and experimentally demonstrated at millimeter-waves. The metallic lens is synthesized by an array of stacked narrow hollow rectangular waveguides working near cutoff emulating an ENZ medium. At the working frequency (fo = 144 GHz, λ0 = 2.08 mm) the focusing properties of the lens demonstrate an experimental transmission power enhancement of 15.9 dB with a good impedance matching with free space.
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IEEE Antennas and Wireless Propagation Letters, 2015
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The 8th European Conference on Antennas and Propagation (EuCAP 2014), 2014
ABSTRACT A zoning technique is applied to reduce the thickness of a fishnet metamaterial lens fro... more ABSTRACT A zoning technique is applied to reduce the thickness of a fishnet metamaterial lens from 35 mm to 8 mm without causing any deterioration in the performance. The lens operates in the NNZ regime (n = -0.25), has an experimental focal length of 46.5 mm and a depth of focus of 17.8 mm. The surface-relief fishnet metamaterial lens opens the door for integrated systems.
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IEEE Transactions on Antennas and Propagation, 2015
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Papers by Bakhtiyar Orazbayev