Asymptotic analysis of the far field of the terahertz antenna

2010 ◽  
Author(s):  
E. A. Gorodnitskiy ◽  
N. S. Averkiev ◽  
A. M. Monakhov ◽  
M. V. Perel
Keyword(s):  
Asymptotic Analysis ◽  
Far Field ◽  
Terahertz Antenna

Far-Field Behavior of Waves in Non-Ideal Magnetogasdynamics

2020 ◽  
Author(s):  
Ankita Sharma ◽  
Rajan Arora
Keyword(s):  
Approximate Solution ◽  
Evolution Equation ◽  
Asymptotic Analysis ◽  
Asymptotic Method ◽  
Nonlinear Waves ◽  
Numerical Technique ◽  
Ideal Gas ◽  
Far Field ◽  
Field Behavior ◽  
Hyperbolic Quasilinear System

We have presented a study on the far-field behavior of weak nonlinear waves in magnetogasdynamics. An asymptotic analysis is carried out for the study. An evolution equation is obtained by using an asymptotic method which helps in learning the far-field behavior of a hyperbolic quasilinear system governing the propagation of nonlinear waves in a non-ideal gas. A numerical technique MVIM is employed to obtain the approximate solution of the evolution equation.

Possible applications of fraunhofer holography in high resolution electron microscopy

1978 ◽  
Vol 36 (1) ◽  
pp. 222-223 ◽  
Author(s):  
N. Bonnet ◽  
M. Troyon ◽  
P. Gallion
Keyword(s):  
Electron Microscopy ◽  
High Resolution ◽  
Transfer Function ◽  
Radiation Damage ◽  
High Resolution Electron Microscopy ◽  
Far Field ◽  
Field Region ◽  
Crystalline Materials ◽  
Resolution Electron ◽  
The Ideal

Two main problems in high resolution electron microscopy are first, the existence of gaps in the transfer function, and then the difficulty to find complex amplitude of the diffracted wawe from registered intensity. The solution of this second problem is in most cases only intended by the realization of several micrographs in different conditions (defocusing distance, illuminating angle, complementary objective apertures…) which can lead to severe problems of contamination or radiation damage for certain specimens.Fraunhofer holography can in principle solve both problems stated above (1,2). The microscope objective is strongly defocused (far-field region) so that the two diffracted beams do not interfere. The ideal transfer function after reconstruction is then unity and the twin image do not overlap on the reconstructed one.We show some applications of the method and results of preliminary tests.Possible application to the study of cavitiesSmall voids (or gas-filled bubbles) created by irradiation in crystalline materials can be observed near the Scherzer focus, but it is then difficult to extract other informations than the approximated size.

Multifunctional far-field luminescence nanoscope for studying single molecules and quantum dots

2018 ◽  
Vol 189 (03) ◽  
pp. 312-322 ◽  
Author(s):  
Ivan Yu. Eremchev ◽  
M.Yu. Eremchev ◽  
Andrei V. Naumov
Keyword(s):  
Quantum Dots ◽  
Single Molecules ◽  
Far Field
Sign in / Sign up

Export Citation Format

Share Document