Abstract

A picosecond pump–probe nonlinear optical measurement is performed in $\mathrm{Si}{\mathrm{O}}_2∕\mathrm{Ti}{\mathrm{O}}_2$ one-dimensional photonic bandgap structures fabricated by a solgel method. Both high and low band edges were examined by varying the probe wavelengths and angle tuning was also employed to further clarify the mechanism of a nonlinear optical response. The third-order nonlinear optical response in one-dimensional photonic bandgap structures that comprise $\mathrm{Ti}{\mathrm{O}}_2$ films is responsible for the nonlinear optical transmissions at both bandgap edges, with an 8% decrease at the low-energy edge and a 4.5% increase at the high-energy edge for a $355\mathrm{nm}$ pump intensity of $430\mathrm{MW}∕{\mathrm{cm}}^2$.

© 2006 Optical Society of America

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