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15 September 2004 Nonlinear optical studies of one-dimensional SOI photonic crystal slabs
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We report on third-harmonic (TH) generation emitted from 1D photonic slabs etched into Silicon-on-Insulator (SOI) planar waveguides, as compared to the bare waveguide and (100) Silicon bulk responses. 130-fs laser pulses at ~ 810 nm and ~1550 nm have been chosen as a pump to excite TH signals in reflection and diffraction directions. The measured angles of in-plane diffracted third-harmonic beams agree with those predicted by nonlinear diffraction equations. The nonlinear reflectance as a function of the angle of incidence and azimuthal orientation of the structure has been measured. The near-infrared measurements have revealed that, whenever the pump frequency is resonant with a photonic mode, a substantial enhancement of the harmonic signal occurs. This nonlinear mechanism is in principle a very sensitive spectroscopic tool in determining and mapping the photonic band diagram of the system above the light line. The agreement between experimental data and ad hoc simulations of the nonlinear behavior of the system sheds new light on the nonlinear optical response of these nanostructured materials.
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Gabriele Vecchi, Andrea M. Malvezzi, Maddalena Patrini, Giorgio Guizzetti, Lucio C. Andreani, Marco Liscidini, Yong Chen, and David Peyrade "Nonlinear optical studies of one-dimensional SOI photonic crystal slabs", Proc. SPIE 5450, Photonic Crystal Materials and Nanostructures, (15 September 2004);

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