22 May 2009 All-optical signal processing based on trapped modes of a photonic crystal resonator
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The photonic crystal (PhCr) sample of a proper shape can exhibit good resonator properties with extremely high Q-factor. The resonator standing modes may be excited by an external source through the special inputs and be controlled due to nonlinear coating. We study typical 1D and 2D photonic resonators of rectangular form with nonlinear inclusions as an important element of logical devices. Depending on the beam intensity and chosen working point near the photonic band edge, the reflectivity may drastically change thus performing the logic operations. The seeming nonlinear band shift effect arises in linear PhCr's total internal reflection area due to nonlinear covering layer. Two main signal processing schemes exist in logic devices made on the base of photonic resonators. We analyze theoretically the resonator parameters for CdS/CdSe and CdS/SiO2 photonic crystals covered with nonlinear doped glasses and preferring processing scheme for IR wavelengths. General design of logic gates and adder design are discussed. Novel calculation method based on 1D resonator's eigenstates analytical basis is used to obtain 2D spectrum.
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Eugene Ya. Glushko, Alexander E. Glushko, Vladimir N. Evteev, Alexander N. Stepanyuk, "All-optical signal processing based on trapped modes of a photonic crystal resonator", Proc. SPIE 7354, Nonlinear Optics and Applications III, 73540L (22 May 2009); doi: 10.1117/12.820551; https://doi.org/10.1117/12.820551

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