Reduced-confinement GaAlAs tapered waveguide antennas for enhanced far-field beam directionality

1991 ◽  
Vol 27 (3) ◽  
pp. 687-695 ◽  
Author(s):  
D.E. Bossi ◽  
W.D. Goodhue ◽  
L.M. Johnson ◽  
R.H. Rediker
Keyword(s):  
Far Field ◽  
Tapered Waveguide ◽  
Beam Directionality

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

Conservative Estimation of Whole-body Average SAR in Infant Model for 0.3-6GHz Far-Field Exposure

2009 ◽  
Vol 129 (12) ◽  
pp. 2102-2107 ◽  
Author(s):  
Akimasa Hirata ◽  
Yoshio Nagaya ◽  
Naoki Ito ◽  
Osamu Fujiwara ◽  
Tomoaki Nagaoka ◽  
...  
Keyword(s):  
Whole Body ◽  
Far Field ◽  
Field Exposure ◽  
Conservative Estimation

Magnetic Tag Antenna for UHF Near-field and Far-Field RFID Applications

2015 ◽  
Vol 5 (2) ◽  
pp. 119
Author(s):  
Mondher Dhaouadi ◽  
M. Mabrouk ◽  
T. Vuong ◽  
A. Ghazel
Keyword(s):  
Near Field ◽  
Far Field ◽  
Rfid Applications

Calculation of the Side and Back Far-Field Zone Radiation for Reflector Antennas with Radio Absorbing Coating on Edges

2004 ◽  
Vol 61 (1) ◽  
pp. 67-74
Author(s):  
O. I. Sukharevsky ◽  
V. A. Vasilets ◽  
S. V. Nechitaylo ◽  
S. V. Orekhov
Keyword(s):  
Far Field ◽  
Field Zone ◽  
Reflector Antennas
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