Results 221 to 230 of about 13,719,025 (270)
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Recording of optical near fields in remote locations by near-field holography
Optics Letters, 2001We propose a method of near-field recording in a space that is quite apart from the original source (generator) of optical near fields. The method is based on the recently developed technique of near-field holography. Experiments based on our method have shown that near fields that originate from sub-diffraction-limit-sized objects can be stored in a ...
K Y, Kim, B, Lee
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2015 IEEE International Symposium on Electromagnetic Compatibility (EMC), 2015
This paper presents efficient methods to transform, interpolate and filter recorded near- and far-fields on spherical surfaces, based on a spectral decomposition of these fields in spherical harmonics. Combining a Fast Fourier Transform (FFT), Discrete Cosine Transform (DCT) and Discrete Sine Transform (DST) reduces the computation time of existing ...
B. Boesman +3 more
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This paper presents efficient methods to transform, interpolate and filter recorded near- and far-fields on spherical surfaces, based on a spectral decomposition of these fields in spherical harmonics. Combining a Fast Fourier Transform (FFT), Discrete Cosine Transform (DCT) and Discrete Sine Transform (DST) reduces the computation time of existing ...
B. Boesman +3 more
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Resolution of near-field to near-field imaging with silver nanolayer
SPIE Proceedings, 2013Interest in plasmonic lenses dates back to the seminal paper of Pendry [Phys. Rev. Lett. 85, 3966 (2000)] who has shown that superresolution is possible due to imaging through a negative-refractive-index material. Experimental verifications of near-field to near-field imaging properties of a single Ag nanolayer have proven that a resolution reaching ...
Tomasz Stefaniuk +3 more
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Near-field ultrasound tomography
The Journal of the Acoustical Society of America, 2007In this paper, a near-field tomographic solution is introduced to solve the imaging problem of fluid objects assumed to be weakly heterogeneous (Born approximation) and excited by spherical waves. The solution to the forward problem is based on the Huygens-Fresnel principle which describes the scattered field as the result of the interference scheme of
Serge, Mensah, Emilie, Franceschini
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Terahertz spectroscopy in the near field
Frontiers in Optics 2007/Laser Science XXIII/Organic Materials and Devices for Displays and Energy Conversion, 2007We observe a terahertz field enhancement in the junction between a sub-wavelength metal probe tip and a metallic substrate. We exploit this in the first observation of a metal-insulator transition using terahertz near-field techniques.
Zhan, Hui +7 more
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Near‐field mapping of surface polariton fields
Journal of Microscopy, 2001Using the general approach to image formation in collection near‐field optical microscopy, I derive the symmetry relations for the amplitude coupling coefficients in the case of a weakly guiding single‐mode fibre terminated with a probe tip possessing axial symmetry.
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Physical Review Letters, 1996
Near-field optical holography, i.e., a technique that allows one to record and reconstruct not only far- but also near-field components of optical fields, is conceptually formulated. A near-field hologram can be recorded with a reference wave, which is totally internally reflected by a surface with quasi-two-dimensional objects on it, and reconstructed
, Bozhevolnyi, , Vohnsen
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Near-field optical holography, i.e., a technique that allows one to record and reconstruct not only far- but also near-field components of optical fields, is conceptually formulated. A near-field hologram can be recorded with a reference wave, which is totally internally reflected by a surface with quasi-two-dimensional objects on it, and reconstructed
, Bozhevolnyi, , Vohnsen
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Near-field diffractive elements
Optics Letters, 2005A novel near-field imaging system is proposed and simulated. It is seen that a significant improvement in performance in the presence of noise is possible without loss of resolution.
Daniel, Marks, P Scott, Carney
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Localization of Signals in the Near-Field of an Antenna Array
IEEE Transactions on Signal Processing, 2019The problem of locating signals transmitted in the proximity of an antenna array has been studied extensively in the signal processing literature. In this paper, we consider the standard array manifold models used in these works and show that they differ,
B. Friedlander
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IEEE transactions on industrial electronics (1982. Print), 2019
This paper presents a new design of near-field focused metasurface for high-efficiency wireless power transfer with multifocus characteristics. A general synthesis procedure is outlined to design metasurfaces with desired multiple foci in the near-field ...
Shixing Yu, Haixia Liu, Long Li
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This paper presents a new design of near-field focused metasurface for high-efficiency wireless power transfer with multifocus characteristics. A general synthesis procedure is outlined to design metasurfaces with desired multiple foci in the near-field ...
Shixing Yu, Haixia Liu, Long Li
semanticscholar +1 more source