Efficiency optimization of a tunable non-mechanical beam steering device based on fringe field switching and Pancharatnam phase

2021 ◽  
Author(s):  
Comrun Yousefzadeh ◽  
Andre van Rynbach ◽  
Philip Bos
Keyword(s):  
Beam Steering ◽  
Fringe Field ◽  
Efficiency Optimization ◽  
Pancharatnam Phase

scholarly journals High-efficiency, tunable, fringe-field switching-mode beam steering based on a liquid crystal Pancharatnam phase

2020 ◽  
Vol 59 (34) ◽  
pp. 10706
Author(s):  
Comrun Yousefzadeh ◽  
Andre Van Rynbach ◽  
Doug Bryant ◽  
Philip Bos
Keyword(s):  
Liquid Crystal ◽  
High Efficiency ◽  
Beam Steering ◽  
Fringe Field ◽  
Pancharatnam Phase ◽  
Mode Beam ◽  
Switching Mode

Fringe field-tunable LC refractive index interface for in-plane beam steering applications

2020 ◽  
Vol 59 (34) ◽  
pp. 10695
Author(s):  
Irina I. Rushnova ◽  
Elena A. Melnikova ◽  
Olga S. Kabanova ◽  
Alexei L. Tolstik ◽  
Alexander A. Muravsky
Keyword(s):  
Refractive Index ◽  
Beam Steering ◽  
Fringe Field

Analysis of a dual-twist Pancharatnam phase device with ultrahigh-efficiency large-angle optical beam steering

2015 ◽  
Vol 54 (34) ◽  
pp. 10035 ◽  
Author(s):  
HsienHui Cheng ◽  
Achintya K. Bhowmik ◽  
Philip J. Bos
Keyword(s):  
Beam Steering ◽  
Large Angle ◽  
Optical Beam ◽  
Pancharatnam Phase

scholarly journals Design of a large aperture, tunable, Pancharatnam phase beam steering device

2020 ◽  
Vol 28 (2) ◽  
pp. 991 ◽  
Author(s):  
Comrun Yousefzadeh ◽  
Andre Van Rynbach ◽  
Philip J. Bos
Keyword(s):  
Beam Steering ◽  
Pancharatnam Phase ◽  
Large Aperture

A Magnetic Spectrometer for a Scanning Transmission Electron Microscope

1974 ◽  
Vol 32 ◽  
pp. 436-437
Author(s):  
A. Kosiara ◽  
J. W. Wiggins ◽  
M. Beer
Keyword(s):  
Scanning Transmission Electron Microscope ◽  
Magnetic Spectrometer ◽  
Fringe Field ◽  
Curvature Radius ◽  
Magnetic Pole ◽  
Quadrupole Field ◽  
Transmission Electron ◽  
Scanning Transmission ◽  
Under Construction ◽  
Image Position

A magnetic spectrometer to be attached to the Johns Hopkins S. T. E. M. is under construction. Its main purpose will be to investigate electron interactions with biological molecules in the energy range of 40 KeV to 100 KeV. The spectrometer is of the type described by Kerwin and by Crewe Its magnetic pole boundary is given by the equationwhere R is the electron curvature radius. In our case, R = 15 cm. The electron beam will be deflected by an angle of 90°. The distance between the electron source and the pole boundary will be 30 cm. A linear fringe field will be generated by a quadrupole field arrangement. This is accomplished by a grounded mirror plate and a 45° taper of the magnetic pole.

An improved magnetic prism design for a transmission electron microscope energy filter

1978 ◽  
Vol 36 (1) ◽  
pp. 40-41 ◽  
Author(s):  
John W. Andrew ◽  
F.P. Ottensmeyer ◽  
E. Martell
Keyword(s):  
Energy Resolution ◽  
Symmetry Plane ◽  
Fringe Field ◽  
Focal Distance ◽  
Electron Trajectories ◽  
Focusing Effect ◽  
Transmission Electron ◽  
Path Lengths ◽  
Electron Microscopes ◽  
Focusing Properties

Energy selecting electron microscopes of the Castaing-Henry prism-mirror-prism design suffer from a loss of image and energy resolution with increasing field of view. These effects can be qualitatively understood by examining the focusing properties of the prism shown in Fig. 1. A cone of electrons emerges from the entrance lens crossover A and impinges on the planar face of the prism. The task of the prism is to focus these electrons to a point B at a focal distance f2 from the side of the prism. Electrons traveling in the plane of the diagram (i.e., the symmetry plane of the prism) are focused toward point B due to the different path lengths of different electron trajectories in the triangularly shaped magnetic field. This is referred to as horizontal focusing; the better this focusing effect the better the energy resolution of the spectrometer. Electrons in a plane perpendicular to the diagram and containing the central ray of the incident cone are focused toward B by the curved fringe field of the prism.

Symmetric-pair antennas for beam steering, direction finding or isotropic-reception gain

1991 ◽  
Vol 138 (4) ◽  
pp. 368 ◽  
Author(s):  
R. Benjamin ◽  
W. Titze ◽  
P.V. Brennan ◽  
H.D. Griffiths
Keyword(s):  
Beam Steering ◽  
Direction Finding ◽  
Symmetric Pair
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