Line-defect–waveguide laser integrated with a point defect in a two-dimensional photonic crystal slab

We realize an active two-dimensional (2D) photonic crystal laser with a combination of line defects and point defects. Based on a line-defect–waveguide laser in a 2D photonic crystal slab, we observe laser emission from the point defect at the waveguide mode-edge frequency when there is a frequency mismatch with the point-defect mode. This phenomenon is due to the wide-field distribution at the waveguide mode edge and its distortion by the adjacent point defect. Numerical calculations estimate the emission efficiency and are in good agreement with experimental results.