Wannier-function expansion of localized modes in 1D photonic crystals without inversion symmetry
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2020-12-01
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Tanaue, Helena B. [UNESP]
Bruno-Alfonso, Alexys [UNESP]
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The localized modes of one-dimensional photonic crystals without inversion symmetry are calculated by using linear combinations of Wannier functions. A closed form is given for the phase of the Bloch function leading to maximally localized Wannier functions. The defect consists of changing the refractive index of one layer in a single unit cell. The results for the frequencies and magnetic-field profiles of the localized modes are found in good agreement with calculations based on the transfer-matrix method. The need for maximally localized Wannier functions is discussed.
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Journal of the Optical Society of America B: Optical Physics, v. 37, n. 12, p. 3698-3706, 2020.