Non-trivial scaling of self-phase modulation and three-photon absorption in III-V photonic crystal waveguides

Details Non-trivial scaling of self-phase modulation and three-photon absorption in III-V photonic crystal waveguides Non-trivial scaling of self-phase modulation and three-photon absorption in III-V photonic crystal waveguides

2009-11-24

arxiv.org/abs/0911.4538v1

Physics

Optics

10 pages, 4 figures

Scientific paper

We investigate the nonlinear response of photonic crystal waveguides with suppressed two-photon absorption. A moderate decrease of the group velocity (~ c/6 to c/15, a factor of 2.5) results in a dramatic (30x) enhancement of three-photon absorption well beyond the expected scaling, proportional to 1/(vg)^3. This non-trivial scaling of the effective nonlinear coefficients results from pulse compression, which further enhances the optical field beyond that of purely slow-group velocity interactions. These observations are enabled in mm-long slow-light photonic crystal waveguides owing to the strong anomalous group-velocity dispersion and positive chirp. Our numerical physical model matches measurements remarkably.

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