737 research outputs found
Communication satellite systems for Alaska
Technical and cost factors for implementation of Alaskan communication satellite syste
DC-assisted microwave quenching of YBa2Cu3O7-{\delta} coplanar waveguide to a highly dissipative state
The paper reports on finding the effect of a strong change in the microwave
losses in an HTS-based coplanar waveguide (CPW) at certain values of the input
power Pin and direct current Idc. CPW on the basis of 150 nm thick
YBa2Cu3O7-{\delta} epitaxial film on a single crystal MgO substrate was studied
experimentally. A sharp and reversible transition of the CPW into a strongly
dissipative state at the certain meanings of Pin and Idc depending on
temperature was observed. Apparently the effect can be explained by
self-heating of HTS structure caused by magnetic flux flow under the joint
influence of MW and DC.Comment: 9 pages, 5 figures, 17 reference
Multiresonances of quasi-trapped modes in metasurfaces based on nanoparticles of transition metal dichalcogenides
The features of polarization control of multiple multiresonances for
quasi-trapped modes excited by synchronization of bianisotropic dipole
responses in MoS disks with a hole are considered. Using the numerical
calculations with analytical multipole analysis, we showed that the presence of
a strong optical anisotropy of MoS nanoparticles provides an additional
degree of freedom and allows to observe several resonances of electric and
magnetic dipoles at once in a narrow spectral range. Based on the simulation
results, we obtained the frequency dependences for the dipole polarizabilities
of the MoS disk with a hole, which allow one to distinguish the
contributions of the nonlocal and bianisotropic dipole responses and possessing
several features in the near infrared range. Using the polarizability spectra
of single nanoparticles and applying the tuning strategy, the design of the
MoS metasurface supporting three resonances of quasi-trapped modes at once
in a narrow spectral range was developed. One of these resonances corresponds
to the telecom wavelength of 1550 nm. The spectrum of light reflection for
MoS metasurface is characterized by three narrowband dips corresponding to
the wavelengths of the quasi-trapped modes. It was shown that a change in the
polarization of a wave normally incident on the metasurface to orthogonal one
leads to a change in the type of bianisotropic response excited in each MoS
disk and to the excitation of three other features in the reflection spectra of
the metasurface at wavelengths close to the initial values.Comment: 8 pages, 5 figure
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