We demonstrate experimentally the tuning of complete photonic band gaps in patterned silicon nitride waveguides. Transmission measurements were performed using an ultrabroadband high-brightness white light laser continuum, extracting extinction ratios as low as 10(-4) in the gap regions. Angle-resolved measurements show the perfect alignment of the gap around the Gamma-J direction. (C) 2000 American Institute of Physics. [S0003-6951(00)02008-8].
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