Single Photonic-Crystal Defect Switch for All-Optical Ultrafast Operation Using Two Photon Absorption

Kyozo KANAMOTO  Sheng LAN  Naoki IKEDA  Yu TANAKA  Yoshimasa SUGIMOTO  Kiyoshi ASAKAWA  Hiroshi ISHIKAWA  

IEICE TRANSACTIONS on Electronics   Vol.E87-C   No.7   pp.1142-1147
Publication Date: 2004/07/01
Online ISSN: 
Print ISSN: 0916-8516
Type of Manuscript: Special Section PAPER (Special Section on Ultrafast Photonics)
photonic-crystal,  all optical switch,  optical nonlinearity,  ultrashort optical pulse,  two-photon absorption,  

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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.