CORRELATION OF ELECTROMAGNETIC FIELD AMPLITUDE FLUCTUATIONS IN TIME AND SPACE ON A LONG LINE-OF-SIGHT (212 km) U.H.F. (1760 Mc/s) OVERWATER RADIO PATH

1967 ◽  
pp. 237-239
Author(s):  
JOHN S. NICOLIS
Keyword(s):  
Electromagnetic Field ◽  
Field Amplitude ◽  
Line Of Sight ◽  
Time And Space ◽  
Radio Path ◽  
Amplitude Fluctuations ◽  
Long Line

scholarly journals Numerical Study of Plasmonic Efficiency of Gold Nanostripes for Molecule Detection

2015 ◽  
Vol 2015 ◽  
pp. 1-8 ◽  
Author(s):  
Thomas Grosges ◽  
Dominique Barchiesi
Keyword(s):  
Finite Element Method ◽  
Electromagnetic Field ◽  
Numerical Study ◽  
Field Enhancement ◽  
Field Amplitude ◽  
Geometrical Parameters ◽  
Error Estimator ◽  
Optimization Scheme ◽  
Electromagnetic Excitation ◽  
Active Zones

In plasmonics, the accurate computation of the electromagnetic field enhancement is necessary in determining the amplitude and the spatial extension of the field around nanostructures. Here, the problem of the interaction between an electromagnetic excitation and gold nanostripes is solved. An optimization scheme, including an adaptive remeshing process with error estimator, is used to solve the problem through a finite element method. The variations of the electromagnetic field amplitude and the plasmonic active zones around nanostructures for molecule detection are studied in this paper taking into account the physical and geometrical parameters of the nanostripes. The evolution between the sizes and number of nanostripes is shown.

scholarly journals Application of tomographic algorithms to Polar Mesospheric Cloud observations by Odin/OSIRIS

2012 ◽  
Vol 5 (3) ◽  
pp. 3693-3716 ◽  
Author(s):  
K. Hultgren ◽  
J. Gumbel ◽  
D. A. Degenstein ◽  
A. E. Bourassa ◽  
N. D. Lloyd
Keyword(s):  
Vertical Structure ◽  
Line Of Sight ◽  
Multiple Views ◽  
Maximum Probability ◽  
Polar Mesospheric Clouds ◽  
Short Limb ◽  
Infrared Imager ◽  
Long Line ◽  
Mesospheric Clouds ◽  
Tomographic Analysis

Abstract. Limb-scanning satellites can provide global information about the vertical structure of Polar Mesospheric Clouds. However, information about horizontal structures usually remains limited. This is due to both a long line of sight and a long scan duration. On eighteen days during the Northern Hemisphere summers 2010–2011 and the Southern Hemisphere summer 2011/2012, the Swedish-led Odin satellite was operated in a special mesospheric mode with short limb scans limited to the altitude range of Polar Mesospheric Clouds. For Odin's Optical Spectrograph and InfraRed Imager System (OSIRIS) this provides multiple views through a given cloud volume and, thus, a basis for tomographic analysis of the vertical/horizontal cloud structure. Here we present algorithms for tomographic analysis of mesospheric clouds based on maximum probability techniques. We also present results of simulating OSIRIS tomography and retrieved cloud structures from the special tomographic periods.

scholarly journals Minimum Total Noise in Wave-Mixing Processes

2012 ◽  
Vol 2012 ◽  
pp. 1-4 ◽  
Author(s):  
Savita Gill ◽  
Sunil Rani ◽  
Nafa Singh
Keyword(s):  
Large Amplitude ◽  
Higher Order ◽  
Field Amplitude ◽  
Wave Mixing ◽  
Squeezed State ◽  
Nonclassical States ◽  
Mixing Processes ◽  
Amplitude Fluctuations ◽  
Total Noise ◽  
Field State

Higher-order squeezing in different optical processes such as seven-wave mixing and five-wave mixing has been studied. The total noise of a field state is a measure of the fluctuations of the field amplitude. It is shown that the minimum total noise (Tmin) of a higher-order squeezed state always increases with the increase in nonclassicality associated with higher-order squeezing. Thus, fromTmin, one can conclude that highly nonclassical states have large amplitude fluctuations.

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