Results 41 to 50 of about 8,681 (211)
Analysis, Design and Fabrication of centimeter-wave Dielectric Fresnel Zone Plate Lens and reflector [PDF]
, 2005 Fresnel lens has a long history in optics. This concept at non-optical wavelengths is also applicable. In this paper we report design and fabrication of a half and quarter wave dielectric Fresnel lens made of Plexiglas, and a Fresnel reflector at 11.1 ...
A. Mahmoudi +11 more
core +2 more sources
Nonlinear fresnel zone plate reflector [PDF]
2016 IEEE International Symposium on Antennas and Propagation (APSURSI), 2016 This paper describes a nonlinear Fresnel zone plate reflector designed to operate at 2.8GHz. The alternating Fresnel zones of the reflector are made from two different nonlinear metamaterials: one that reflects like a short circuit at low incident power levels and another that reflects like an open circuit.
openaire +1 more source
Refracting profiles and generalized holodiagrams [PDF]
, 2007 The recently developed concept of refracting profiles and that of refraction holodiagrams are combined so that the classical Abramson holodiagrams can be generalized taking into account a wider class of wave fronts and refraction at an interface ...
Abramson +19 more
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Achromatic acoustic generalized phase-reversal zone plates
New Journal of Physics, 2022 We report an achromatic acoustic generalized phase-reversal zone plate by harnessing the response of dipole and monopole, which eliminate the chromatic aberration of conventional zone plates.
Gaokun Yu, Xinyu Zou, Peifeng Wang
doaj +1 more source
BeSense: Leveraging WiFi Channel Data and Computational Intelligence for Behavior Analysis
, 2020 The ever evolving informatics technology has gradually bounded human and computer in a compact way. Understanding user behavior becomes a key enabler in many fields such as sedentary-related healthcare, human-computer interaction (HCI) and affective ...
Gu, Yu +3 more
core +1 more source
Multiwavelength polarization insensitive lenses based on dielectric metasurfaces with meta-molecules [PDF]
, 2016 Metasurfaces are nano-structured devices composed of arrays of subwavelength scatterers (or meta-atoms) that manipulate the wavefront, polarization, or intensity of light.
Arbabi, Amir +4 more
core +3 more sources
The application of Fresnel zone plate based projection in optofluidic microscopy [PDF]
, 2008 Optofluidic microscopy (OFM) is a novel technique for low-cost, high-resolution on-chip microscopy imaging. In this paper we report the use of the Fresnel zone plate (FZP) based projection in OFM as a cost-effective and compact means for projecting the ...
Cui, Xiquan +3 more
core +1 more source
Um experimento simples usado na produção de placas de zonas de Fresnel
Revista Brasileira de Ensino de FísicaNeste trabalho propomos um experimento simples que tem por finalidade auxiliar no aprendizado dos fenômenos de interferência e difração da luz. Após uma análise pertinente da teoria de Fresnel da difração, os conhecimentos são aplicados na compreensão do
Márcia Muller +2 more
doaj +1 more source
Advances in Mechanical Engineering, 2017 This article demonstrates the fabrication of large-scale micro-structures by two-photon polymerization with an integrated long-stroke precision stage. We first design a three-axial stage that combines a piezoelectric transducer stage and a stepper-motor ...
Fu-Cheng Wang +3 more
doaj +1 more source
Terahertz metasurface zone plates with arbitrary polarizations to a fixed polarization conversion
Opto-Electronic Science, 2022 Metasurfaces that can realize the polarization manipulation of electromagnetic waves on the sub-wavelength scale have become an emerging research field. Here, a novel strategy of combining the metasurface and Fresnel zone plate to form a metasurface zone
Zhen Yue +10 more
doaj +1 more source