Abstract
Based on theoretical approach and three-dimensional modeling using the CST Microwave Studio code, planar dielectric two-dimensional Bragg structures in terahertz frequency range were developed and manufactured. Proof-of-principle electrodynamic experiments on the “cold” testing of these structures were carried out. It is shown that the experimental results are in good agreement with the theoretical predicts, including the existence of the highest Q mode inside the Bragg reflection band in the absence of periodicity defects.
Highlights
The use of two-dimensional distributed feedback (2D DF) has been proposed in Refs. 1 and 2 as a method of producing spatially coherent radiation from either sheet or annular highcurrent relativistic electron beams with the transverse size greatly exceeding the wavelength
The operability of the new feedback mechanism has been experimentally demonstrated in the FEMs, which were elaborated in the millimeter wavelength range under a record transverse size of the interaction space, reaching up to 50 wavelengths, and the output power level of ~ 50 - 100 MW [3, 4]
One of the attractive ways to solve mode selection problem in heterolasers is the use of novel 2D feedback mechanism, which in this case can be realized by 2D Bragg structures of planar geometry with doubleperiodical modulation of the effective refractive index of the dielectric waveguide
Summary
The use of two-dimensional distributed feedback (2D DF) has been proposed in Refs. 1 and 2 as a method of producing spatially coherent radiation from either sheet or annular highcurrent relativistic electron beams with the transverse size greatly exceeding the wavelength. 1 and 2 as a method of producing spatially coherent radiation from either sheet or annular highcurrent relativistic electron beams with the transverse size greatly exceeding the wavelength. In this case, such feedback can be realized in 2D Bragg metallic cavities of planar and coaxial geometry having a double-periodic corrugation of the side walls. On this corrugation, mutual scattering of the electromagnetic energy fluxes propagating in the forward, backward and transverse directions (relative to the direction of the electron beam propagation) takes place. "Cold" tests of prototypes of the structures were carried out in terahertz frequency range and demonstrated good coincidence with the design parameters
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