Constant-speed straight-line propagation in free space is a basic characteristic of light, and spatiotemporal couplings recently were used to control light propagation. In the method of flying focus, where temporal chirp and longitudinal chromatism were combined, tunable-velocities and even backward-...
constant velocities, are assumed, and the wave propagation medium is taken as free space (vacuum), allowing for relatively simple transformations from one inertial reference-frame to another.A consistent use of plane-wave integral representations is conducive to a systematic and trackable relativistic ...
The evolution of the combined system of the electron and two photonic states follows the following unitary operators: S1 and S2 for the electron interaction with the two photonic states, and Uφ for free-space propagation. As detailed in Supplementary Note 1.1, the multiplication of these ...
www.nature.com/scientificreports OPEN Modal coupling and crosstalk due to turbulence and divergence on free space THz links using multiple orbital angular momentum beams Zhe Zhao1*, Runzhou Zhang1, Hao Song1, Kai Pang1, Ahmed Almaiman1,2, Huibin Zhou1, Haoqian Song...
1. 4. Example of the measurement As an example of the measurement of the complex relative permittivity in free space a sample of Teflon plate is chosen because of its known parameters. The thickness of the sample is 2 mm and is placed between the transmitting and receiving antenna. The ...
[LEO]), small satellites, unmanned air vehicle (UAV)/airplane, and high-altitude platforms (HAP) are considered, discussing different communication channelpropagation characteristicsfor each of the scenarios. Space-to-groundfree-space optical communicationslinks have been successfully demonstrated from ...
Machine learning can be used to build an emulator for CFD using design of experiments data to characterize the design space. The machine learning emulator can then be used for optimization, sensitivity, and uncertainty quantification. Several journal papers have demonstrated this potential (including ...
Recently, a new free-space method was developed for constitutive parameters E*and p* are calculated from the the accurate determination of the dielectric constant and measured SIIand For thin and flexible samples of loss tangent of nonmagnetic materials such as Teflon and magnetic materials, the ...
We have shown that the so constructed lattices preserve their structure in the free-space propagation over a distance essentially exceeding the Rayleigh (diffraction) length. We have presented the analytical model describing the vortex-antivortex crystallization, which results from the globally balanced ...
Re(neff) corresponds to the propagation constant β = Re(neff)β0 of the waveguide mode (β0 = 2π/λ0 is the free-space wavenumber) and determines the tilt-angle θtilt of the slab-mode direction of propagation relative to the waveguide. For the chosen value of h0, the effe...