Zobrazeno 1 - 10
of 10
pro vyhledávání: '"Anton V. Hlushchenko"'
Non-Hermitian photonics based on combining loss and gain media within a single optical system provides a number of approaches to control and generate the flow of light. In this paper, we show that by introducing non-Hermitian perturbation into the sy
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::b988d7f53cb649c907b9551de3e5f669
Publikováno v:
2021 46th International Conference on Infrared, Millimeter and Terahertz Waves (IRMMW-THz).
A multimode analytical approach is used to investigate the PT-symmetry in hybrid modes of a loss-gain waveguide coupler operated in the THz range. It is shown that loss compensation in this coupler can be achieved by varying the distance between loss
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::7b4f0bc4521c7ba8f9286e0433c85948
https://doi.org/10.1109/irmmw-thz50926.2021.9567124
https://doi.org/10.1109/irmmw-thz50926.2021.9567124
Publikováno v:
Physical Review A. 104
Loss compensation via inserting gain is of fundamental importance in different branches of photonics, nanoplasmonics, and metamaterial science. This effect has found an impressive implementation in the parity-time symmetric ($\mathcal{PT}$-symmetric)
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::6ecb69c6479c5067e50953b9afd63755
https://doi.org/10.1103/physreva.104.013507
https://doi.org/10.1103/physreva.104.013507
Autor:
Konstantinos A. Avramidis, Aleksandr V. Maksimenko, Vitalii I. Shcherbinin, Viktor Tkachenko, John Jelonnek, Anton V. Hlushchenko
Publikováno v:
IEEE Transactions on Electron Devices. 66:1552-1558
In the fixed-field (cold) approximation, a generalized formula is derived for the starting currents of eigenmodes excited by an electron beam in a gyrotron cavity with the mode conversion. Tapered gyrotron cavities with gradual and abrupt transitions
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::507836552ce92fb47c0866166143791a
https://doi.org/10.1109/ted.2019.2893888
https://doi.org/10.1109/ted.2019.2893888
Publikováno v:
IEEE Transactions on Microwave Theory and Techniques. 67:577-583
The coupled transcendental equations describing cutoff frequencies of TE and TM modes are deduced for a rectangular waveguide with arbitrary wall impedance. In the case of TE modes, their generalization is made to a rectangular guiding structure, whi
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::d90c3f27b0bcf11fbe87a9c478eaa997
https://doi.org/10.1109/tmtt.2018.2882493
https://doi.org/10.1109/tmtt.2018.2882493
Publikováno v:
2021 5th IEEE Electron Devices Technology & Manufacturing Conference (EDTM).
By exploiting recent advances in optical couplers, we introduce the concept of a quasi-PT-symmetric lasing system with balanced gain and loss. Loss compensation (LC) symmetry is investigated for an asymmetric waveguide coupler composed of two unequal
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::ea9a1ab0d4a1c763d64a962d70e41cf1
https://doi.org/10.1109/edtm50988.2021.9420912
https://doi.org/10.1109/edtm50988.2021.9420912
Publikováno v:
Journal of Optics. 23:125002
A pair of coupled dielectric waveguides with balanced loss and gain is the basic system for observing the phenomena of parity-time ( ) symmetry and exceptional points (EPs). We use the multimode analytical approach to study the peculiarities of inter
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::0fdac7586552e912f317846a411e3490
https://doi.org/10.1088/2040-8986/ac31d4
https://doi.org/10.1088/2040-8986/ac31d4
Publikováno v:
IEEE Transactions on Electron Devices. 64:3898-3903
The problem of power degradation due to the dominant ohmic losses in gyrotron cavity is considered. As an example, the operating performances of the FU CW III gyrotron of Fukui University are investigated numerically. It is found that, for this gyrot
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::ea259208fbb8308fe77d093a1ed56717
https://doi.org/10.1109/ted.2017.2730252
https://doi.org/10.1109/ted.2017.2730252
Publikováno v:
Laser Physics Letters. 17:116202
We investigate the loss compensation phenomenon in an asymmetric coupler composed of a pair of unequally sized dielectric cylinders with gain and loss. A multimode analytical approach is applied to solve the eigenvalue problem for the coupler. This a
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::5d7c4bd0f22c62ee261028c8dc5c8416
https://doi.org/10.1088/1612-202x/abbef9
https://doi.org/10.1088/1612-202x/abbef9
Publikováno v:
2017 IEEE First Ukraine Conference on Electrical and Computer Engineering (UKRCON).
A comparison between non-self-consistent and self-consistent treatments of ohmic losses in gyrotron cavity is presented. As an example, the output power of currently available 1-THz 5-kW gyrotron is investigated numerically. It is found that ohmic lo
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::c8232b8c2280fe35ec7888554c68ac85
https://doi.org/10.1109/ukrcon.2017.8100320
https://doi.org/10.1109/ukrcon.2017.8100320