9 July 2003 Tunable photonic stop band in metallodielectric photonic crystals via magnetic-field-induced order-disorder transition
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Abstract
We fabricated a photonic bandgap material consisting of a stack of containers with steel spheres. In the absence of external magnetic field the particles are in a disordered state. Magnetic field magnetizes the particles and they self-assemble into ordered crystalline state. We study mm-wave transmission through the stack as a function of magnetic field, i.e. for different degrees of order. This system exhibits a well-defined stopband in the ordered state, while in the disordered state the stopband becomes completely smeared. We model our results using the effective-medium approximation. We relate the disappearance of the stopband in the disordered state to the fluctuations in refraction index and admittance of individual layers. These fluctuations arise from the in-plane density fluctuations. Magnetic field suppresses density fluctuations and thus controls electromagnetic wave propagation through teh stack.
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Michael Golosovsky, Yair Neve-Oz, Dan Davidov, "Tunable photonic stop band in metallodielectric photonic crystals via magnetic-field-induced order-disorder transition", Proc. SPIE 5218, Complex Mediums IV: Beyond Linear Isotropic Dielectrics, (9 July 2003); doi: 10.1117/12.508438; https://doi.org/10.1117/12.508438
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