We investigate a simple way to create dynamic photonic crystals with different lattice symmetry by interference of four non-coplanar laser beams in colloidal solution of CdSe/ZnS quantum dots (QDs). The formation of dynamic photonic crystal was confirmed by the observed diffraction of the beams that have excited photonic crystal at the angles equal to that calculated for the corresponding three-dimensional lattice (self-diffraction regime). Self-diffraction from an induced 3D transient photonic crystal has been discovered in the case of resonant excitation of the excitons (electron – hole transitions) in CdSe/ZnS QDs (highly absorbing colloidal solution) by powerful beams of mode-locked laser with picosecond pulse duration. Self-diffraction arises for four laser beams intersecting in the cell with colloidal CdSe/ZnS QDs due to the induced 3D dynamic photonic crystal. The physical processes that arise in CdSe/ZnS QDs and are responsible for the observed self-action effects are discussed.
A. M. Smirnov, V. N. Mantsevich, K. V. Ezhova, I. V. Tikhonov, and V. S. Dneprovskii, "Three-dimensional dynamic photonic crystal creation by four laser beams interference in colloidal quantum dots," Proc. SPIE 9894, Nonlinear Optics and its Applications IV, 98940O (Presented at SPIE Photonics Europe: April 05, 2016; Published: 27 April 2016); https://doi.org/10.1117/12.2227839.
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Study of self-shadowing effect as a simple means to realize nanostructured thin films and layers with special attentions to birefringent obliquely deposited thin films and photo-luminescent porous silicon