scholarly journals A Wide-angle Multi-Octave Broadband Waveplate Based on Field Transformation Approach

2015 ◽  
Vol 5 (1) ◽  
Author(s):  
Junming Zhao ◽  
Lianhong Zhang ◽  
Jensen Li ◽  
Yijun Feng ◽  
Amy Dyke ◽  
...  
Keyword(s):  
Wide Angle ◽  
Field Transformation ◽  
Transformation Approach

scholarly journals Wide-angle method for vortex electromagnetic wave generation using field transformation

2020 ◽  
Vol 69 (13) ◽  
pp. 135201
Author(s):  
Jia-Lin Feng ◽  
Hong-Yu Shi ◽  
Yuan Wang ◽  
An-Xue Zhang ◽  
Zhuo Xu
Keyword(s):  
Electromagnetic Wave ◽  
Wave Generation ◽  
Wide Angle ◽  
Field Transformation ◽  
Angle Method

CBED Shadow Images and Cs:Aberration Measurement

1982 ◽  
Vol 40 ◽  
pp. 696-697
Author(s):  
R. W. Carpenter ◽  
I.Y.T. Chan ◽  
J. M. Cowley
Keyword(s):  
Focal Point ◽  
Spherical Aberration ◽  
Optic Axis ◽  
Wide Angle ◽  
Caustic Surface ◽  
Convergent Beam

Wide-angle convergent beam shadow images(CBSI) exhibit several characteristic distortions resulting from spherical aberration. The most prominent is a circle of infinite magnification resulting from rays having equal values of a forming a cross-over on the optic axis at some distance before reaching the paraxial focal point. This distortion is called the tangential circle of infinite magnification; it can be used to align and stigmate a STEM and to determine Cs for the probe forming lens. A second distortion, the radial circle of infinite magnification, results from a cross-over on the lens caustic surface of rays with differing values of ∝a, also before the paraxial focal point of the lens.

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