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

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 (with loss) and doped (with gain) silicon. Since the quality factor of the trapped-mode resonance can be controlled by changing both spatial symmetry and non-Hermiticity, varying loss and gain allows us to compensate for the influence of asymmetry and restore the quality factor of the localized mode. The results obtained suggest new ways to achieve high-quality resonances in non-Hermitian metamaterials promising for many practical applications in nanophotonics.

arXiv comment7 pages, 6 figures

References in corpus (14)

• Asymmetric metasurfaces with high-$Q$ resonances governed by bound states in the continuum
• Sharp dark-mode resonances in planar metamaterials with broken structural symmetry
• Loss-induced suppression and revival of lasing
• Strain multiplexed metasurface holograms on a stretchable substrate
• Interference traps waves in open system: Bound states in the continuum
• High-quality trapped modes in all-dielectric metamaterials
• Experimental Demonstration of Phase Modulation and Motion Sensing Using Graphene-Integrated Metasurfaces
• Quasi-bound states in the continuum induced by $\mathcal{P}\mathcal{T}$-symmetry breaking
• Giant red shift and enhancement of resonant light confinement in planar array of dielectric bars
• Optical bistability involving planar metamaterial with broken structural symmetry
• Quantum optical effective-medium theory for loss-compensated metamaterials
• Enhancement of absorption bistability by trapping light planar metamaterial
• Nonlinear interaction of two trapped-mode resonances in a bilayer fish-scale metamaterial
• Multimode parity-time and loss-compensation symmetries in coupled waveguides with loss and gain

Cited by in corpus (1)

• Quantum optical effective-medium theory for layered metamaterials