1,721,043 research outputs found
Electron beam lithography overlay process with sub-20nm accuracy for 3D metamaterials and metadevices
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Dynamic flat optical devices realized by doped semiconductors and functional liquid crystals
No full textIn this abstract, dynamic flat optical devices with tunable materials like doped semiconductors and functional liquid crystals have been demonstrated such as tunable color filters and stimuli-responsive dynamic metaholograms for advanced display and sensor applications.1
Moth-eye shaped on-demand broadband and switchable perfect absorbers based on vanadium dioxide
No full textTwo biomimetic, moth-eye structure, perfect absorbers in the visible and near infrared regions are introduced and investigated. The moth-eye structure is made up of vanadium oxide (VO2), which is a phase change material that changes from an insulator state to a metallic state at around 85 degrees C. The VO2 structure sits on top of a sapphire (Al2O3) dielectric spacer layer, above a gold (Au) back reflector. Two perfect absorbers are designed, one with perfect absorption over an ultra-broadband range between 400 and 1,600nm, for both the insulating and metallic phases, while the second can switch between being a perfect absorber or not in the range 1,000 and 1,600nm. The absorption profiles and electric and magnetic fields are examined and discussed to provide insight into how absorbers function in the four different situations.11Ysciescopu
Flat optical components based on metasurfaces: hologram, absorber and metalens for generating optical vortex
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