Topic
Fresnel zone
About: Fresnel zone is a research topic. Over the lifetime, 2337 publications have been published within this topic receiving 37650 citations.
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01 Jan 2011
TL;DR: In this paper, a new calculation method of the definition of ground-renected Fresnel zone is derived from the definition Huygens -Fresnel principle, and the relation between the caculation results of propagation parameters and this new method are given, and compared to practical test.
Abstract: ical analysis and practical test show that the traditional ground-renected Fresnel zone calculating method has error with the actual situation. The method of calculating traditional ground-renected Fresnel zone and the error sources are studied at the beginning of this paper, Then a new calculation method of the definition of ground-renected Fresnel zone is derived from the definition of Huygens -Fresnel principle. The relation between the caculation results of propagation parameters and this new method are given, and compared to practical test. Result shows that the new method is more reasonable than the traditional method. The method will playa big role on guiding station distribution using in line-of-sight propagation at HF and Microwave band, the method also completes the theory ofsight propagation.
29 Nov 2007
TL;DR: In this article, the axial and radial distribution patterns of X-ray Fresnel zone plate were analyzed and the Full Width at Half-Maximum (FWHM), Depth Of Focus (DOF), and Strehl efficiency of focus spot were studied.
Abstract: In this paper, we calculated the numeric results of diffraction field in space of X-ray (λ=4.5nm) Fresnel zone plate based on angular spectrum method, analyzed the axial and radial distribution patterns of X-ray Fresnel zone plate. The Full Width at Half-Maximum (FWHM), Depth Of Focus (DOF) and Strehl efficiency of focus spot were studied. Discussed the relationships between FPZ's design parameter and focus spot properties. At the condition of λ=4.5nm and the outmost width Wn =50nm, the size of focus spot is proportional to the outmost width, and increase slowly with the increase of number of zones and focus length; the DOF of focus spot increase at first; when the focus length increased to 40µm, the DOF incline to a constant; the focus spot's Strehl efficiency increased slowly with the increase of number of zones and focus length.© (2007) COPYRIGHT SPIE--The International Society for Optical Engineering. Downloading of the abstract is permitted for personal use only.
18 Nov 2008
TL;DR: In this article, the dependence of the retransmitting meter output signal phase on the range in the Fresnel zone has been determined and the source of the phase distortions, which has been investigated, is the Retransmitter phase parameters deflection from the values needed for one-side spectrum harmonic compensation.
Abstract: The dependence of the retransmitting meter output signal phase on the range in the Fresnel zone has been determined. The source of the phase distortions, which has been investigated, is the retransmitter phase parameters deflection from the values needed for one-side spectrum harmonic compensation.
01 Jan 2008
TL;DR: In this article, the authors demonstrate the manipulation of nanoparticles using surface plasmon polaritons and demonstrate the performance of microfabricated optical tweezers with respect to diffraction efficiency.
Abstract: Microfabricated optical tweezers are reviewed. Fresnel zone plates are shown to offer comparable performance to traditional optical tweezers, when diffraction efficiency is taken into account. We demonstrate the manipulation of nanoparticles using surface plasmon polaritons.