6 May 2008 Asymmetry reversal and waveguide modes in photonic crystal slabs
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Abstract
The measured reflection spectra of two-dimensional photonic crystal slabs consist of an asymmetric peak on top of an oscillating background. For p-polarized light, the asymmetry of the peak flips for angles of incidence beyond Brewster's angle. We explain the observed line shapes with a Fano model that includes loss and use a waveguide model to predict the resonance frequencies of the photonic crystal slab. Finite-difference time domain calculations support the model and show that the resonance due to a higher order mode disappears when the substrate refractive index is increased beyond ns = 2.04. This is readily explained by the cut-off condition of the modes given by the waveguide model.
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E. F. C. Driessen, E. F. C. Driessen, P. O. M. Heemskerk, P. O. M. Heemskerk, D. Stolwijk, D. Stolwijk, E. W. J. M. van der Drift, E. W. J. M. van der Drift, M. J. A. de Dood, M. J. A. de Dood, } "Asymmetry reversal and waveguide modes in photonic crystal slabs", Proc. SPIE 6989, Photonic Crystal Materials and Devices VIII, 69890G (6 May 2008); doi: 10.1117/12.780455; https://doi.org/10.1117/12.780455
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