Threshold Gain due to Distributed-Feedback in Two-Dimensional Triangular- and Square-Lattice Photonic Crystal Lasers

概要

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Numerical simulation of 2D square (SQ)- and triangular (TR)-lattice infinite-width photonic crystal distributed-feedback (DFB) lasers showed that the threshold gain ($g_{\text{th}}$) for the 3rd photonic band was the smallest in the $\Gamma$–X direction (SQ-lattice), and was next smallest in the $\Gamma$–M direction (TR-lattice), but one order of magnitude larger. The $g_{\text{th}}$ values for the 3rd photonic bands were qualitatively proportional to the slopes approximated for the 3rd bands, but the $g_{\text{th}}$ values for the 1st bands were independent of the lattice structure and direction. All the $g_{\text{th}}$ values for the 1st and 3rd bands decreased to about 1/50 of the original values when the thickness was increased from 8 to 32 cylinders because of the approaching of the threshold wavelength to the band edge and the longer optical path.
Publication Office, Japanese Journal of Applied Physics, Faculty of Science, University of Tokyoの論文
2001-01-15