Developement of nonlinear photonic materials by using semiconductor quantum dot-photopolymer composites

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We have investigated enhanced third- and high-order optical nonlinearities in photopolymerizable semiconductor CdSe quantum dot-photopolymer composites (QDPCs) as well as the nonlinear optical effects in QDPCs with the holographically formed photonic lattice structure. We have showed that CdSe quantum dots can be uniformly dispersed as high as 7 vol.% in photopolymer. We have measured the increased third- and fifth-order nonlinear refraction and saturable absorption in uniformly cured QDPC films. We have also observed high-order self-diffraction phenomena in a degenerate multi-wave mixing configuration and achieved nonlinear Bragg diffraction from a holographically formed Bragg grating in a QDPC film. In addition, we have performed a theoretical analysis of the phase transition dynamics in QDPCs under holographic exposure, by which the dynamics of Bragg grating formation have been clarified quantitatively.