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#metamirrors

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Public
AEI has moved

🌟 New selected research highlight 🌟

Tunable highly reflective metasurfaces – International team led by @unihannover researchers demonstrate wavelength-selective metamirrors based on sapphire and silicon nanoparticles

Metasurfaces are sheet materials with artificial structures smaller than the electromagnetic wavelength with which they interact. A new study led by researchers at the Institute for Gravitational Physics at @unihannover, Germany, presents the first experimental validation of the feasibility of realizing a reflective metasurface at selected wavelengths. The metasurface presented in this study is based on a single-layer nanoparticle array consisting of silicon cylinders on a sapphire substrate. The fabricated structures have a reflectivity of about 95% (at 1064 nm or 1550 nm), which can be improved by further optimization of the fabrication and characterization processes. This technology has the potential to be used in future gravitational-wave detectors. There, single-layer reflective surfaces mitigate coating thermal noise, an important source of instrumental disturbance.

ℹ️ aei.mpg.de/1202212/tunable-hig
📄 onlinelibrary.wiley.com/doi/10 (Open Access)

A graph with two insets. The inset on the left shows a CAD drawing of a metasurface composed of silicon nanocylinders (4 by 4 purple cylinders) on top of a sapphire substrate (grey rectangular slab). The inset on the top right shows an SEM image of the fabricated nanocylinder metasurface, with a 1 μm scalebar. The graph shows the reflectivity of fabricated metasurfaces compared to their theoretical predictions. The reflectivity experimentally measured for the metasurfaces designed with mirror effect at 1550 nm wavelength the experimental reflectivity is presented by a magenta line. The thickness of the lines characterizes the uncontrollable small variation of the signal during the measurements. The black dash-dotted lines correspond to the theoretical simulations. The dashed vertical lines show the spectral positions of the wavelengths, demonstrating the alignment between the experimental and theoretical reflection resonances.
#metasurface#photonics#metamirrors
Public
AEI has moved

🌟 Neues Forschungshighlight 🌟

Tunable highly reflective metasurfaces – International team led by @unihannover researchers demonstrate wavelength-selective metamirrors based on sapphire and silicon nanoparticles

Metasurfaces are sheet materials with artificial structures smaller than the electromagnetic wavelength with which they interact. A new study led by researchers at the Institute for Gravitational Physics at @unihannover, Germany, presents the first experimental validation of the feasibility of realizing a reflective metasurface at selected wavelengths. The metasurface presented in this study is based on a single-layer nanoparticle array consisting of silicon cylinders on a sapphire substrate. The fabricated structures have a reflectivity of about 95% (at 1064 nm or 1550 nm), which can be improved by further optimization of the fabrication and characterization processes. This technology has the potential to be used in future gravitational-wave detectors. There, single-layer reflective surfaces mitigate coating thermal noise, an important source of instrumental disturbance.

ℹ️ aei.mpg.de/1202729/tunable-hig (englisch)
📄 onlinelibrary.wiley.com/doi/10 (Open Access)

A graph with two insets. The inset on the left shows a CAD drawing of a metasurface composed of silicon nanocylinders (4 by 4 purple cylinders) on top of a sapphire substrate (grey rectangular slab). The inset on the top right shows an SEM image of the fabricated nanocylinder metasurface, with a 1 μm scalebar. The graph shows the reflectivity of fabricated metasurfaces compared to their theoretical predictions. The reflectivity experimentally measured for the metasurfaces designed with mirror effect at 1550 nm wavelength the experimental reflectivity is presented by a magenta line. The thickness of the lines characterizes the uncontrollable small variation of the signal during the measurements. The black dash-dotted lines correspond to the theoretical simulations. The dashed vertical lines show the spectral positions of the wavelengths, demonstrating the alignment between the experimental and theoretical reflection resonances.
#metasurface#photonics#metamirrors
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