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Kyozo KANAMOTO Sheng LAN Naoki IKEDA Yu TANAKA Yoshimasa SUGIMOTO Kiyoshi ASAKAWA Hiroshi ISHIKAWA
An all-optical switch based on a single photonic crystal defect with an air-bridge configuration and two-photon absorption was proposed, fabricated and characterized. In optical measurements, we obtained a sharp defect mode with a quality factor higher than 600 at 1.55 µm. More importantly, we observed its nonlinear response to the excitation of ultrashort pulses by utilizing two-photon absorption. Nonliner refractive index change of about -410-3 was achieved at a pumping power density of 3.6109 W/cm2.
Yoshimasa SUGIMOTO Yu TANAKA Naoki IKEDA Kyozo KANAMOTO Yusui NAKAMURA Shunsuke OHKOUCHI Hitoshi NAKAMURA Kuon INOUE Hidekazu SASAKI Yoshinori WATANABE Koji ISHIDA Hiroshi ISHIKAWA Kiyoshi ASAKAWA
We have fabricated several two-dimensional photonic-crystal (2DPC) slab waveguides by using fine electron beam lithography and dry etching. The 2DPC waveguides include straight, bend, Y-branch, directional coupler, and coupled-cavity waveguides on the GaAs/AlGaAs substrate as an application to the ultra-small and ultra-fast all-optical switching device. Transmission spectra and near field patterns were characterized in a wide wavelength range from 850 to 1600 nm with the sample finished to the air-bridge type 2DPC slab. These waveguides appear to be suitable for achieving the waveguide platform in the symmetrical-Mach-Zehnder device.