Peculiarities of mode spectrum in two-dimensional Bragg structures

N.S. Ginzburg, N.Y. Peskov, A.S. Sergeev, A.D.R. Phelps, A.W. Cross

Research output: Contribution to journalArticle

1 Citation (Scopus)

Abstract

The fundamental difference in the eigenmode spectrum for traditional one-dimensional (1D) periodical Bragg structures and novel two-dimensional (2D) periodical Bragg structures of planar and coaxial geometry is discussed. In the case of 1D Bragg structures, the eigenmode frequencies are located outside the Bragg reflection zone while for 2D Bragg structures the highest Q-factor modes are located just near to the frequency of Bragg resonance and the mechanism for the formation of these modes is related to the coupling of the longitudinal and transverse propagating wave fluxes. The main eigenmode possesses a Q-factor which substantially exceeds the Q-factor of the other modes even in the case when the system transverse size is much greater than the wavelength that encourage the use of 2D Bragg structures for mode selection in powerful oscillators with oversized microwave systems.
Original languageEnglish
Pages (from-to)309-315
Number of pages7
JournalOptics Communications
Volume250
Issue number4-6
DOIs
Publication statusPublished - 15 Jun 2005

Keywords

  • free-electron laser
  • Bragg resonator
  • microwaves

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