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Surface enhanced perfect absorption in metamaterials with periodic dielectric nanostrips on silver film
摘要： Integrated dielectric metamaterials with plasmonic structures can cause drastic optical resonances and strengthen the capacity of light absorption. Here, we describe the optical properties of silicon nanoarrays on a thin silver film for extreme light confinement at subwavelength nanoscales. We attain the nearly total absorption in silicon nanostrips, which support magnetic quadruple Mie-type resonances in the visible regions. The Mie resonant field of the dielectric nanostrip engages the screening response of the silver film, resulting in plasmon resonance configuration and thus achieving perfect light absorption in the dielectric nanostrip. Moreover, we can attain similar results in other nanostructures, such as silicon cylinder and rhombus column arrays. Because it can sustain hybridized plasmon modes and magnetic modes, the combined system will benefit the application of solar energy accumulation.
关键词： surface plasmon polaritons,plasmonic structures,dielectric metamaterials,Mie resonances,perfect absorption
更新于2025-09-10 09:29:36
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Nonlinear light generation in topological nanostructures
摘要： Topological photonics has emerged as a route to robust optical circuitry protected against disorder and now includes demonstrations such as topologically protected lasing and single-photon transport. Recently, nonlinear optical topological structures have attracted special theoretical interest, as they enable tuning of topological properties by a change in the light intensity and can break optical reciprocity to realize full topological protection. However, so far, non-reciprocal topological states have only been realized using magneto-optical materials and macroscopic set-ups with external magnets, which is not feasible for nanoscale integration. Here we report the observation of a third-harmonic signal from a topologically non-trivial zigzag array of dielectric nanoparticles and the demonstration of strong enhancement of the nonlinear photon generation at the edge states of the array. The signal enhancement is due to the interaction between the Mie resonances of silicon nanoparticles and the topological localization of the electric field at the edges. The system is also robust against various perturbations and structural defects. Moreover, we show that the interplay between topology, bi-anisotropy and nonlinearity makes parametric photon generation tunable and non-reciprocal. Our study brings nonlinear topological photonics concepts to the realm of nanoscience.
关键词： Silicon nanoparticles,Nonlinear light generation,Third-harmonic signal,Mie resonances,Topological nanostructures
更新于2025-09-09 09:28:46
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Optical equilibrium for resonant particles induced by surface plasmons of two-dimensional materials
摘要： The optomechanical interaction of a resonant particle with a current sheet, graphene for example, induced by its surface plasmon is investigated. It is predicted that stable equilibrium positions for the particle at finite distances from the sheet can be formed. For high-index dielectric particles the equilibria take place in a finite frequency range close to the Mie resonances. Thus, the excitation of resonances by the plasmon and their coupling to the sheet give rise to the strong repulsion, which competes against the usually prevailing attraction induced by the evanescent tail. The formation of purely optical stable equilibria for particles outside of waveguiding structures can find applications for particle propulsion, sorting, and in various systems that require particle isolation.
关键词： resonant particle,particle sorting,surface plasmon,stable equilibrium,particle propulsion,optomechanical interaction,Mie resonances
更新于2025-09-04 15:30:14