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UrduMetasurfaces are formed by engineering a glass surface with an array of microscopic features, or meta-atoms. Although different optical functionalities can be obtained by changing only the pattern, the resulting metasurfaces often lack the necessary efficiency for many applications. In this report, scientists from Corning and Harvard University collaborate to demonstrate an inverse-design method that optimizes efficiency while respecting fabrication constraints. These results represent a step forward in making practical metasurfaces for broader applications.
Tag: optical systems
A new compact diffractive imager for subwavelength resolution
The researchers propose a new method for achieving subwavelength resolution imaging for phase and amplitude objects. Their technique relies on diffractive encoding and decoding with a solid-immersion layer to recover high-frequency information corresponding to the subwavelength features of an object.
Ultrablack Coating Could Make Next-Gen Telescopes Even Better
For telescopes operating in the vacuum of space, or optical equipment in extreme environments, existing coatings are often insufficient. In the Journal of Vacuum Science & Technology Aresearchers in China turned to atomic layer deposition and developed an ultrablack thin-film coating for aerospace-grade magnesium alloys. The team used alternating layers of aluminum-doped titanium carbide and silicon nitride and together the materials prevent nearly all light from reflecting off the coated surface. The coating absorbs 99.3% of light while being durable enough to survive in harsh conditions.