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Numerical simulations on laser absorption enhancement in hybrid metallo-dielectric nanostructured targets for future nuclear astrophysics experiments
摘要： The linear electromagnetic interaction between innovative hybrid metallo-dielectric nanostructured targets and laser in visible and IR range is investigated through numerical simulations. The obtained results rely on the optimization of a target based on metallic nanowires (NWs) to enhance light absorption in the visible range of the electromagnetic spectrum. The NWs are grown within the ordered nanoholes of an alumina substrate, thus, forming a plasmonic lattice with triangular symmetry. The remaining volume of the nanoholes on top of the NWs is sealed with a transparent layer of aluminum oxide that is suitable to be chemically modified for containing about 25% of deuterium atoms. The study presented here is carried out within the framework of a scientific program named PLANETA (Plasmonic Laser Absorption on Nano-Engineered Targets) aiming at investigating new laser–matter interaction schemes in the ns domain and for nuclear fusion purposes, involving especially the D–D reaction.
关键词： D–D reaction,metallo-dielectric nanostructured targets,nuclear astrophysics,laser absorption,plasmonic lattice
更新于2025-09-23 15:21:01
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Optimal High Efficiency 3D Plasmonic Metasurface Elements Revealed by Lazy Ants
摘要： Recent transmissive optical metamaterials that leverage a generalized form of Snell’s law to induce anomalous refraction of light have garnered considerable interest in both optical and materials communities. However, most of these designs have primarily centered around parametric studies of planar canonical structures for their low profile and relative ease of manufacturing. In many of these cases, all-dielectric designs are preferred over metallodielectrics due to their low loss characteristics. Moreover, considering modern advances in nanofabrication techniques, these canonical structures represent only a small portion of the design space that is explorable. In this work, we exploit a generalized Multi-Objective Lazy Ant Colony Optimization (MOLACO) algorithm and a modified Pareto locus search mechanism to optimize arbitrary three-dimensional meta-material unit cells in the optical regime based on the Membrane Projection Lithography technique. Our exploration has revealed unintuitive metallodielectric structures for phase-gradient metasurface applications in the mid-wave infrared (MWIR) regime that achieve transmission magnitudes comparable to the highest-performance all-dielectric designs found in the literature. As a proof-of-concept, a beam-steering metasurface is synthesized using these unintuitive unit cell geometries and is shown to achieve over 84% diffraction efficiency which is among the highest performing metallodielectric metasurfaces in the MWIR reported to date.
关键词： Three-Dimensional,Metallo-dielectric,Metasurface,Optimization,Inverse-Design
更新于2025-09-19 17:13:59
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[IEEE 2018 12th International Congress on Artificial Materials for Novel Wave Phenomena (Metamaterials) - Espoo, Finland (2018.8.27-2018.9.1)] 2018 12th International Congress on Artificial Materials for Novel Wave Phenomena (Metamaterials) - Eccentric metallo-dielectric core-shell nanoparticles for switching and guiding purposes
摘要： Metallo-dielectric or dielectric-dielectric core-shell nanoparticles have been proposed during last years for enhancing the near Zero-Forward and Zero-Backward conditions because they support tunable electric and magnetic resonances. By changing the relative size of the core respect to the particle size, electric and magnetic resonances are shifted. As a consequence, they can be used to control the direction of the scattered radiation. Here, we demonstrate the possibility of using isolated eccentric metallo-dielectric core-shell nanoparticles for redirecting the incident radiation into some specific directions eventually different from the forward and backward ones. In particular, we show their utility for building operational switching devices, whose on/off state only depends on the polarization of the incident radiation. Chains of these scattering units have shown good radiation guiding effects at the nanoscale level.
关键词： metallo-dielectric,core-shell nanoparticles,scattering directionality,radiation guiding,switching devices
更新于2025-09-10 09:29:36