Trapped-mode excitation in all-dielectric metamaterials with loss and gain

نویسندگان

چکیده

Non-Hermitian photonics based on combining loss and gain media within a single optical system provides number of approaches to control generate the flow light. In this paper, we show that by introducing non-Hermitian perturbation into with constituents, high-quality resonances known as trapped modes can be excited without need change symmetry unit cell geometry. To demonstrate idea, consider widely used all-dielectric planar metamaterial whose consists pair rectangular nanoantennae made ordinal (with loss) doped gain) silicon. Since quality factor trapped-mode resonance controlled changing both spatial non-Hermiticity, varying allows us compensate for influence asymmetry restore localized mode. The results obtained suggest new ways achieve in metamaterials are promising many practical applications nanophotonics.

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ژورنال

عنوان ژورنال: Physical review

سال: 2022

ISSN: ['0556-2813', '1538-4497', '1089-490X']

DOI: https://doi.org/10.1103/physrevb.106.155429