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In this work, threshold mode structures of two- dimensional (2D) photonic crystal (PC) lasers are presented. The subjects of this paper are flnite photonic crystal structures with circular holes arranged in square and triangular lattices. In each case, both transverse magnetic (TM) and transverse electric (TE) polarization are studied. The analysis is based on the coupled-wave equations and analyzes modes' behavior for the wide range of coupling coe-cient values. The laser mode is characterized by threshold gain and frequency deviation, and these quantities depend on coupling constants, which means that the threshold gain of the mode and the mode's frequency deviation depend on the coupling constants. Presented analysis gives an interesting insight into behavior of the modes in photonic crystal lasers.

THE THRESHOLD MODE STRUCTURE ANALYSIS OF THE TWO-DIMENSIONAL PHOTONIC CRYSTAL LASERS