4.6 Article

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

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OPTICS EXPRESS
卷 17, 期 25, 页码 22442-22451

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OPTICAL SOC AMER
DOI: 10.1364/OE.17.022442

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  1. European Commission
  2. Fulbright Grant
  3. National Science Foundation
  4. New York State Foundation for Science, Technology and Innovation

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We investigate the nonlinear response of photonic crystal waveguides with suppressed two-photon absorption. A moderate decrease of the group velocity (similar to c/6 to c/15, a factor of 2.5) results in a dramatic (x 30) enhancement of three-photon absorption well beyond the expected scaling, proportional to 1/v(g)(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. (C) 2009 Optical Society of America

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