21 April 2008 Nonlinear photonic structures for all-optical deflection
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We demonstrate both experimentally and numerically continuous all-optical deflection achieved in specially designed photonic structures in quadratic nonlinear materials and discuss their special properties using Fourier space analysis. We designed and manufactured the proposed structures in a Stoichiometric Lithium Tantalate crystal. The inverted domains consist of a set of arcs arranged in the propagation direction. This arrangement results in a periodic pattern in the propagation direction and a chirped pattern in the transverse direction. A second harmonic generation experiment was performed on the crystal structures to examine the phase matching properties. Varying the pump wavelength from 1545 nm to 1536 nm at 150°C resulted in continuous angular deflection of the second harmonic wave up to ~2.5°. Continuous deflection was also obtained by varying the crystal temperature at a fixed pump wavelength. These structures can be used for various all-optical deflection applications, e.g. all-optical router using two cascaded nonlinear processes: an up-conversion process of signal and control beams, where the output channel is controlled by the frequency of the controlling beam, followed by a down conversion process, creating a beam at the signal frequency in the desired channel.
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Tal Ellenbogen, Tal Ellenbogen, Ayelet Ganany-Padowicz, Ayelet Ganany-Padowicz, Ady Arie, Ady Arie, } "Nonlinear photonic structures for all-optical deflection", Proc. SPIE 6989, Photonic Crystal Materials and Devices VIII, 698916 (21 April 2008); doi: 10.1117/12.780808; https://doi.org/10.1117/12.780808

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