Advanced quantum dot and photonic crystal technologies for integrated nanophotonic circuits

✍ Scribed by Y. Sugimoto; N. Ikeda; N. Ozaki; Y. Watanabe; S. Ohkouchi; T. Kuroda; T. Mano; T. Ochiai; K. Kuroda; N. Koguchi; K. Sakoda; K. Asakawa

• Publisher: Elsevier Science
• Year: 2009
• Tongue: English
• Weight: 1002 KB
• Volume: 40
• Category: Article
• ISSN: 0026-2692
• DOI: 10.1016/j.mejo.2008.11.003

✦ Synopsis

Two types of nanophotonic technologies-two-dimensional photonic crystal (2D PC) slab waveguides (WGs) and quantum dots (QDs)-were developed for key photonic device structures in the future. For an ultrafast digital photonic network, an ultrasmall and ultrafast symmetrical Mach-Zehnder (SMZ)type all-optical switch (PC-SMZ) and an optical flip-flop device (PC-FF) have been developed. To realize these devices, one method is to develop a selective-area molecular beam epitaxial growth QD technique by employing a metal mask method. Another method is to establish a new design method, i.e., topology optimization of the 2DPC WG with a wide and flat bandwidth, high transmittance, and low reflectivity. We also fabricated an optical microcavity in a photonic crystal slab embedded with GaAs QDs by droplet epitaxy. The Purcell effect on the exciton emission of GaAs QDs was confirmed by microphotoluminescence and lifetime measurements.