scholarly journals Active meta-device for angular dispersion elimination of dual-polarizated transmission windows

2021 ◽  
Author(s):  
Hui Bai ◽  
Mingbao Yan ◽  
he wang ◽  
Jiafu Wang ◽  
Lin Zheng ◽  
...  
Keyword(s):  
Angular Dispersion ◽  
Transmission Windows

scholarly journals Quantitative estimates of average geomagnetic axial dipole dominance in deep geological time

2020 ◽  
Vol 11 (1) ◽  
Author(s):  
Andrew J. Biggin ◽  
Richard K. Bono ◽  
Domenico G. Meduri ◽  
Courtney J. Sprain ◽  
Christopher J. Davies ◽  
...  
Keyword(s):  
Power Law ◽  
Geomagnetic Field ◽  
Recent Observation ◽  
Observational Constraint ◽  
Angular Dispersion ◽  
Geological Time ◽  
Future Studies ◽  
Axial Dipole ◽  
Quantitative Estimates

AbstractA defining characteristic of the recent geomagnetic field is its dominant axial dipole which provides its navigational utility and dictates the shape of the magnetosphere. Going back through time, much less is known about the degree of axial dipole dominance. Here we use a substantial and diverse set of 3D numerical dynamo simulations and recent observation-based field models to derive a power law relationship between the angular dispersion of virtual geomagnetic poles at the equator and the median axial dipole dominance measured at Earth’s surface. Applying this relation to published estimates of equatorial angular dispersion implies that geomagnetic axial dipole dominance averaged over 107–109 years has remained moderately high and stable through large parts of geological time. This provides an observational constraint to future studies of the geodynamo and palaeomagnetosphere. It also provides some reassurance as to the reliability of palaeogeographical reconstructions provided by palaeomagnetism.

scholarly journals Spatial characterization of propagation channels for terahertz band

2021 ◽  
Vol 3 (2) ◽  
Author(s):  
Bilal Aghoutane ◽  
Mohammed El Ghzaoui ◽  
Hanan El Faylali
Keyword(s):  
Communication Systems ◽  
Indoor Environment ◽  
Channel Model ◽  
Path Loss ◽  
Propagation Loss ◽  
Terahertz Band ◽  
Indoor Scenarios ◽  
Transmission Windows ◽  
Sv Channel

AbstractThe aim of this work consists in characterizing the Terahertz (THz) propagation channel in an indoor environment, in order to propose a channel model for THz bands. We first described a propagation loss model by taking into account the attenuation of the channel as a function of distance and frequency. The impulse response of the channel is then described by a set of rays, characterized by their amplitude, their delay and their phase. Apart from the frequency selective nature, path loss in THz band is also an others issue associated with THz communication systems. This work based on the conventional Saleh-Valenzuela (SV) model which is intended for indoor scenarios. In this paper, we have introduced random variables as Line of sight (LOS) component, and then merging it with the SV channel model to adopt it to the THz context. From simulation, we noted an important effect when the distance between the transmitter and the receiver change. This effect produces variations in frequency loss. The simulations carried out from this model show that to enhance the performance of THz system it is recommended to transmit information over transmission windows instead over the whole band.

scholarly journals Angular dispersion compensation for acousto-optic devices used for ultrashort-pulsed laser micromachining

2001 ◽  
Vol 9 (4) ◽  
pp. 200 ◽  
Author(s):  
B.K. Ann Ngoi ◽  
Krishnan Venkatakrishnan ◽  
L.E.N. Lim ◽  
B. Tan
Keyword(s):  
Dispersion Compensation ◽  
Pulsed Laser ◽  
Laser Micromachining ◽  
Angular Dispersion ◽  
Ultrashort Pulsed Laser

scholarly journals Beam tilt and angular dispersion in broad-bandwidth, nanosecond optical parametric oscillators

1999 ◽  
Vol 16 (9) ◽  
pp. 1525 ◽  
Author(s):  
W. J. Alford ◽  
Russell J. Gehr ◽  
R. L. Schmitt ◽  
A. V. Smith ◽  
Gunnar Arisholm
Keyword(s):  
Optical Parametric Oscillators ◽  
Angular Dispersion ◽  
Broad Bandwidth ◽  
Parametric Oscillators ◽  
Optical Parametric

High dispersive TIR-GRISMs with flattened angular dispersion profile

2020 ◽  
Author(s):  
M. Heusinger ◽  
T. Flügel-Paul ◽  
K. Grabowski ◽  
D. Michaelis ◽  
U. D. Zeitner
Keyword(s):  
Angular Dispersion ◽  
Dispersion Profile

Angular dispersion: an enabling tool in nonlinear and quantum optics

2010 ◽  
Vol 2 (3) ◽  
pp. 319 ◽  
Author(s):  
Juan P. Torres ◽  
Martin Hendrych ◽  
Alejandra Valencia
Keyword(s):  
Quantum Optics ◽  
Angular Dispersion
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