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- W4281924871 abstract "Non-Hermitian photonics based on combining loss and gain media within a single optical system provides a number of approaches to control and generate the flow of light. In this paper, we show that by introducing non-Hermitian perturbation into the system with loss and gain constituents, the high-quality resonances known as trapped modes can be excited without the need to change the symmetry of the unit cell geometry. To demonstrate this idea, we consider a widely used all-dielectric planar metamaterial whose unit cell consists of a pair of rectangular nanoantennas made of ordinal (lossy) and doped (gainy) silicon. Since the quality factor of the trapped-mode resonance can be controlled by changing both geometrical symmetry and non-Hermiticity, varying loss and gain allows us to compensate for the influence of asymmetry and restore an almost perfectly localized trapped mode. The results obtained suggest new ways to achieve high-quality resonances in non-Hermitian metasurfaces promising for many practical applications in nanophotonics." @default.
- W4281924871 created "2022-06-13" @default.
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- W4281924871 date "2022-05-30" @default.
- W4281924871 modified "2023-10-16" @default.
- W4281924871 title "Trapped mode excitation in all-dielectric metamaterials with loss and gain" @default.
- W4281924871 hasPublicationYear "2022" @default.
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