Mode identification of high-quality-factor single-defect nanocavities in quantum dot-embedded photonic crystals

作者：Shirane Masayuki^*; Kono Shunsuke; Ushida Jun; Ohkouchi Shunsuke; Ikeda Naoki; Sugimoto Yoshimasa; Tomita Akihisa

来源：Journal of Applied Physics, 2007, 101(7): 073107.

DOI：10.1063/1.2714644

We investigate the quality (Q) factor and the mode dispersion of single-defect nanocavities based on a triangular-lattice GaAs photonic-crystal (PC) membrane, which contain InAs quantum dots (QDs) as a broadband emitter. To obtain a high Q factor for the dipole mode, we modulate the radii and positions of the air holes surrounding the nanocavity while keeping sixfold symmetry. A maximum Q of 17 000 is experimentally demonstrated with a mode volume of V=0.39(lambda/n)(3). We obtain a Q/V of 44 000(n/lambda)(3), one of the highest values ever reported with QD-embedded PC nanocavities. We also observe ten cavity modes within the first photonic band gap for the modulated structure. Their dispersion and polarization properties agree well with the numerical results.

• 出版日期2007-4-1