Man-made structural colors, which originate from resonant interactions between visible light and manufactured nanostructures, are emerging as a solution for ink-free color printing. Scientists now show that non-iridescent structural colors can be conveniently produced by nanostructures made from high-index dielectric materials. Compared to plasmonic analogs, color surfaces with high-index dielectrics, such as germanium (Ge), have a lower reflectance, yielding a superior color contrast. Taking advantage of band-to-band absorption in Ge, we laser-postprocess Ge color metasurfaces with morphology-dependent resonances. Strong on-resonance energy absorption under pulsed laser irradiation locally elevates the lattice temperature (exceeding 1200 K) in an ultrashort time scale (1 ns). This forms the basis for resonant laser printing, where rapid melting allows for surface energy–driven morphology changes with associated modification of color appearance. Laser-printable high-index dielectric color metasurfaces are scalable to a large area and open a new paradigm for printing and decoration with nonfading and vibrant colors.
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Amazing Science
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Amazing science facts - 3D_printing • aging • AI • anthropology • art • astronomy • bigdata • bioinformatics • biology • biotech • chemistry • computers • cosmology • education • environment • evolution • future • genetics • genomics • geosciences • green_energy • language • map • material_science • math • med • medicine • microscopy • nanotech • neuroscience • paleontology • photography • photonics • physics • postings • robotics • science • technology • video
Curated by
Dr. Stefan Gruenwald
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Berkeley Lab scientists reveal how nanoscience will bring us cleaner energy, faster computers, and improved medicine.
Alex Weber-Bargioni: How can we see things at the nanoscale? Alex is pioneering new methods that provide unprecedented insight into nanoscale materials and molecular interactions. The goal is to create rules for building nanoscale materials.
Babak Sanii: Nature is an expert at making nanoscale devices such as proteins. Babak is developing ways to see these biological widgets, which could help scientists develop synthetic devices that mimic the best that nature has to offer.
Ting Xu: How are we going to make nanoscale devices? A future in which materials and devices are able to assemble themselves may not be that far down the road. Ting is finding ways to induce a wide range of nanoscopic building blocks to assemble into complex structures. 
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ME 599: Nanoparticles and Nanomanufacturing Video Course - taught by Professor John Hart at the University of Michigan, discusses the properties, synthesis, assembly and applications of nanostructures and nanostructured materials. The course has 24 individual lectures, each 90 min long.
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A team of researchers at Kyoto University and the University of Oxford have successfully used DNA building blocks to construct a motor capable of navigating a programmable network of tracks with multiple switches.
DNA origami and other bionano-structures video collection:
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But if they are stuck down so successfully - how do they ever get them unstuck? Chris Clemente is studying the mechanisms that ants and other insects (especially cockroaches) use to stick and unstick, and also to walk down as well as up walls. He also considers the applications that this might one day help to develop a 'supersuper glue' and to improve the movement of robots.
Sandy Honess's curator insight,
March 14, 2013 9:24 AM
This is amazing. Asian weaver ant. Fluid filled ant feet makes them stick. This guy would make a great speaker at pest management events. I wish he was here in the States.
Sandy Honess's curator insight,
March 14, 2013 9:40 AM
This is amazing. I have never viewed a breakdown of how ants and roaches travel and can hold on to smooth surfaces, upside down, like this expert has demonstrated.
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Researchers at MIT have found a new way of making complex three-dimensional structures using self-assembling polymer materials that form tiny wires and junctions. The work has the potential to usher in a new generation of microchips and other devices made up of submicroscopic features.
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In the video, a race car with dimensions of 330x130x100µm3 is fabricated. The structure consists of 100 layers, each made of an average of 200 polymer lines. It is finished in 4 minutes and resembles the CAD file at a precision of ±1µm. Via Sakis Koukouvis
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