Near-field mapping of the electromagnetic field in confined photon geometries

2002 ◽  
Vol 66 (11) ◽  
Author(s):  
V. Zhuk ◽  
D.V. Regelman ◽  
D. Gershoni ◽  
M. Bayer ◽  
J.P. Reithmaier ◽  
...  
Keyword(s):  
Electromagnetic Field ◽  
Near Field ◽  
Field Mapping

scholarly journals Near field mapping of coupled photonic crystal microcavities

2010 ◽  
Vol 210 ◽  
pp. 012059
Author(s):  
S Vignolini ◽  
F Intonti ◽  
M Zani ◽  
F Riboli ◽  
D S Wiersma ◽  
...  
Keyword(s):  
Photonic Crystal ◽  
Near Field ◽  
Field Mapping ◽  
Photonic Crystal Microcavities

scholarly journals Amplitude- and Phase-Resolved Near-Field Mapping of Infrared Antenna Modes by Transmission-Mode Scattering-Type Near-Field Microscopy

2010 ◽  
Vol 114 (16) ◽  
pp. 7341-7345 ◽  
Author(s):  
Martin Schnell ◽  
Aitzol Garcia-Etxarri ◽  
Andreas J. Huber ◽  
Kenneth B. Crozier ◽  
Andrei Borisov ◽  
...  
Keyword(s):  
Near Field ◽  
Transmission Mode ◽  
Field Mapping

scholarly journals ВОССТАНОВЛЕНИЕ КОГЕРЕНТНЫХ ИЗОБРАЖЕНИЙ ПОВЕРХНОСТЕЙ В ЗОНЕ ФРЕНЕЛЯ МЕТОДАМИ МНОГОКАНАЛЬНОЙ ОБРАБОТКИ СИГНАЛОВ

2018 ◽  
pp. 97-102
Author(s):  
Валерий Константинович Волосюк ◽  
Семён Сергеевич Жила ◽  
Глеб Сергеевич Черепнин ◽  
Эдуард Алексеевич Цернэ
Keyword(s):  
Electromagnetic Field ◽  
Phase Distribution ◽  
Near Field ◽  
Delta Function ◽  
Basic Function ◽  
Ambiguity Function ◽  
Good Resolution ◽  
Fresnel Region ◽  
Coherent Image ◽  
Multichannel Signal Processing

The generalized structure of the electromagnetic field in the registration area is considered in the case of the solution of problems of remote sensing of the underlying surfaces. Examples of the existing radar and optical coherent devices are given. Analytical expressions for the electromagnetic field in the reception area when sounding is carried out in a near-field Fresnel region, in the assumption that the size of the field of registration and radiation is considerably less than a distance between them, are concretized. It is shown the main operations that are necessary for the recovery of coherent images in a near-field Fresnel region by the methods of multichannel signal processing. Research shows that as the amplitude-phase distribution of the registration field is necessary to choose the classical basic function of Fresnel transformation with the reversed sign in the exponent power. Formally, in an infinite range, the Fresnel transform is invertible, i.e. in the ideal case, the function can be completely restored. However physically to Fresnel's region satisfies area with finite sizes. From the analysis of the obtained operations over the received field, it follows that the radar or optical system forms an estimate of the coherent image in the form of a convolution of a true image of the underlying surface with an ambiguity function. Generally, this function contains two multipliers, one of which determines the resolution of recovery of the coherent image. In that specific case, when the linear sizes of the field of registration go to infinity, ambiguity function takes a form of delta function and the required image can be restored without distortions. It is offered to determine resolution by the width between first zeros of ambiguity function. For rectangular area ambiguity function has the form of two sinc functions which width is directly proportional to wavelength, to the height of sounding and is inversely proportional to the linear sizes of receiving area on the corresponding coordinates. Finally, it is mentioned that for the higher-quality coherent imaging with good resolution by the same receiving area it is necessary to perform scanning and movement in space

Recent Progress in Electromagnetic Field Mapping at the Nanoscale

Microscopy ◽  
2014 ◽  
Vol 63 (suppl 1) ◽  
pp. i1.2-i1 ◽  
Author(s):  
R. E. Dunin-Borkowski
Keyword(s):  
Electromagnetic Field ◽  
Recent Progress ◽  
Field Mapping

scholarly journals Computed terahertz near-field mapping of molecular resonances of lactose stereo-isomer impurities with sub-attomole sensitivity

2019 ◽  
Vol 9 (1) ◽  
Author(s):  
Kiwon Moon ◽  
Youngwoong Do ◽  
Hongkyu Park ◽  
Jeonghoi Kim ◽  
Hyuna Kang ◽  
...  
Keyword(s):  
Near Field ◽  
Theoretical Models ◽  
Low Energy ◽  
Molecular Vibration ◽  
Organic Crystals ◽  
Molecular Fingerprinting ◽  
Field Mapping ◽  
Near Field Imaging ◽  
Vibration Dynamics ◽  
Molecular Resonance

AbstractTerahertz near-field microscopy (THz-NFM) could locally probe low-energy molecular vibration dynamics below diffraction limits, showing promise to decipher intermolecular interactions of biomolecules and quantum matters with unique THz vibrational fingerprints. However, its realization has been impeded by low spatial and spectral resolutions and lack of theoretical models to quantitatively analyze near-field imaging. Here, we show that THz scattering-type scanning near-field optical microscopy (THz s-SNOM) with a theoretical model can quantitatively measure and image such low-energy molecular interactions, permitting computed spectroscopic near-field mapping of THz molecular resonance spectra. Using crystalline-lactose stereo-isomer (anomer) mixtures (i.e., α-lactose (≥95%, w/w) and β-lactose (≤4%, w/w)), THz s-SNOM resolved local intermolecular vibrations of both anomers with enhanced spatial and spectral resolutions, yielding strong resonances to decipher conformational fingerprint of the trace β-anomer impurity. Its estimated sensitivity was ~0.147 attomoles in ~8 × 10−4 μm3 interaction volume. Our THz s-SNOM platform offers a new path for ultrasensitive molecular fingerprinting of complex mixtures of biomolecules or organic crystals with markedly enhanced spatio-spectral resolutions. This could open up significant possibilities of THz technology in many fields, including biology, chemistry and condensed matter physics as well as semiconductor industries where accurate quantitative mappings of trace isomer impurities are critical but still challenging.

20 GHz Antenna Radiation Pattern Obtained From Near-Field Mapping With Electrooptic Probe on a Single Plane

2020 ◽  
Vol 19 (7) ◽  
pp. 1177-1181
Author(s):  
Gwenael Gaborit ◽  
Philippe Artillan ◽  
Cedric Bermond ◽  
Guillaume Revillod ◽  
Guillaume Chevrier-Gros ◽  
...  
Keyword(s):  
Radiation Pattern ◽  
Near Field ◽  
Antenna Radiation ◽  
Single Plane ◽  
Field Mapping ◽  
Antenna Radiation Pattern

Generation and near-field mapping of Airy plasmons

2010 ◽  
Author(s):  
A. Minovich ◽  
A. E. Klein ◽  
N. Janunts ◽  
T. Pertsch ◽  
D. N. Neshev ◽  
...  
Keyword(s):  
Near Field ◽  
Field Mapping

Near-field mapping of spectroelectrochemical properties of polyaniline

2010 ◽  
Author(s):  
R. Barillé ◽  
O. L. Gribkova ◽  
A. R. Tameev ◽  
A. A. Nekrasov ◽  
V. F. Ivanov ◽  
...  
Keyword(s):  
Near Field ◽  
Field Mapping ◽  
Spectroelectrochemical Properties
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