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Quantum Dots Demonstrate High Luminescence Efficiency STANFORD, Calif., March 22, 2019 — A new technique for precisely measuring quantum dot (QD) performance, developed by researchers at Stanford University, showed that groups of QDs reliably emit about 99.6 percent of the light they absorb, with a potential error of 0.2 percent in either direction. The measurement technique focuses on how efficiently QDs re-emit the light they absorb. The results suggest that, contrary to long-standing concerns, QDs are defect-tolerant and their emission is comparable to the best single-crystal...
Industrial Laser Proves Effective at Removing Nonstick Coatings CÓRDOBA, Spain, March 22, 2019 — The Manufacturing Processes Engineering research group at the University of Cordoba has validated a new method for the removal of anti-adherent fluoropolymer coatings using a continuous-wave (CW) Nd:YAG laser. The research focused on the factors...
Supercrystal Exhibits a Stable State Over Time STATE COLLEGE, Pa., March 19, 2019 — A supercrystal created by researchers from Pennsylvania State University and Argonne National Laboratory represents a new state of matter with long-term stability. The goal of the research team, which also includes researchers from the University of...
3D Printer Uses Different Wavelengths to Print with Multimaterials MADISON, Wis., March 18, 2019 — A new 3D printer, developed by a team at the University of Wisconsin-Madison, is using different patterns of visible and UV light to provide it with the spatial control necessary to yield multimaterial parts for creating more complex objects. To...
Mele, Kane Win Frontiers of Knowledge Award for Discovering Topological Insulators BILBAO, Spain, March 8, 2019 — Physicists Charles Kane and Eugene Mele are the recipients of the 2019 Frontiers of Knowledge Award, for discovering topological insulators, described as a new class of materials with extraordinary electronic properties.
Research Team Discovers How to Create and Control Structural Color STATE COLLEGE, Pa., and CAMBRIDGE, Mass., March 4, 2019 — Researchers from Pennsylvania State University (Penn State) and the Massachusetts Institute of Technology (MIT) have shown how a clear surface covered in transparent droplets and lit with a single white-light lamp can produce bright, iridescent...
Perovskite Quantum Dots Deliver Coherent Single-Photon Emission CAMBRIDGE, Mass., Feb. 25, 2019 — In an advancement toward a single photon source for use in quantum computing and communications devices, researchers at the Massachusetts Institute of Technology (MIT) and ETH Zurich showed that individual perovskite quantum dots could be used as a...
Defects in Perovskites Could Have Positive Impact on Optoelectronic Devices ST. LOUIS, Feb. 22, 2019 — In a quest to design more efficient solar cells and LEDs, an engineering team from the University of Washington in St. Louis analyzed different types of defects in the semiconductor material that enables such devices to determine if and how these...
Thermally Painted Metasurfaces Yield Perfect Light Absorbers for Sensing, Solar, Stealth Technologies CLEVELAND, Ohio, Feb. 22, 2019 — A 3000-year-old metallurgy technique of heating metal to create vibrant colors creates a nanostructured surface that acts as a perfect light absorber, researchers from Case Western Reserve University have found. The team applied its findings to...
Control of Nanowire Growth Could Advance Nanowire Use in Silicon Photonics LAUSANNE, Switzerland, Feb. 21, 2019 — Researchers from the Swiss Federal Institute of Technology Luasanne (EPFL) Laboratory of Semiconductor Materials, together with colleagues from the Massachusetts Institute of Technology (MIT) and the Ioffe Institute in Russia, have discovered a way...
UTA Engineer Earns NSF CAREER Grant to Develop Bioinspired 3D materials ARLINGTON, Texas, Feb. 20, 2018 — Kyungsuk Yum, an assistant professor at the University of Texas at Arlington, has been awarded a five-year, $500,000 National Science Foundation (NSF) Early Career Development Program grant to design and develop bioinspired 3D materials with...
Strain Engineering Enables Precise Placement of Single Photon Emitters in Semiconductors ROME, N.Y., and WASHINGTON, Feb. 20, 2019 — Scientists at the U.S. Naval Research Laboratory (NRL) and the Air Force Research Laboratory (AFRL) have developed a way to directly write quantum light sources, which emit a single photon of light at a time, into monolayer semiconductors such as...
With a Few Tweaks, a Near-Perfect Absorber Can Become a Time-Reversed Laser DURHAM, N.C., Feb. 19, 2019 — With small adjustments, a near-perfect absorber of electromagnetic waves can be changed into a coherent perfect absorber (CPA), a device that absorbs coherent light and shows near-zero reflectance and high absorption. A CPA, also known as a...
A New Use for Quantum Dots – Tracking the Pollination Process STELLENBOSCH, South Africa, Feb. 18, 2019 — A pollination biologist from Stellenbosch University is breaking new ground in his field by using quantum dots to track and label individual pollen grains. His novel, low-cost method could enable biologists to track the whole pollination process,...
Improving the Stability and Optical Properties of Perovskite Films HONG KONG, Feb. 14, 2019 — A new approach to producing all-inorganic perovskite films — the result of a joint research effort by City University of Hong Kong (CityU) and Shanghai University — could further the development of high-color-purity, low-cost perovskite LEDs with a...
2D Material with Optically Addressable Spin Defects Shows Promise as Host for Quantum Emitters PHILADELPHIA, Feb. 13, 2019 — To harness the capability of quantum computing, hardware must be developed that can access, measure, and manipulate individual quantum states. In response to this need, researchers at the University of Pennsylvania have demonstrated a new hardware...
A New Way to Fabricate High-Performance Optical Metasurfaces for Use in Photonic Circuits LAUSANNE, Switzerland, Feb. 13, 2019 — A way to produce glass metasurfaces that can be either rigid or flexible, developed by engineers from the EPFL Laboratory of Photonic Materials and Fiber Devices, could be used to fabricate all-dielectric optical metasurfaces quickly, at low...
German Companies Partner for Macroscopic Polymer Production AACHEN, Germany, Feb. 11, 2019 — LightFab GmbH, Bartels Mikrotechnik GmbH, Miltenyi Biotec GmbH, and Fraunhofer ILT are jointly executing the HoPro-3D project, a plan to create a new machine for producing macroscopic polymer structures with a resolution in the sub-µm range. The...
Swansea University, Crown Holdings Enter Smart Factory Project Collaboration SWANSEA, Wales, Feb. 8, 2019 — Next-generation smart factories, which use advanced digital technology to improve efficiency, are the focus of a collaboration between packaging manufacturer Crown Holdings Inc. and Swansea University. Swansea’s Cinzia Giannetti at the College of...
Lens-Free, Multicolor Holography Technique Could Enable Compact 3D Displays DURHAM, N.C., Jan. 28, 2019 — A holography technique based on computer-generated holograms (CHGs), developed by a team at Duke University, produces complex, multicolor holographic images without any bulky optical components. The researchers encoded a multicolor image onto a 300-...
UV-Powered Fluid Pump Could be Used to Move Pollutants, Deliver Drugs STATE COLLEGE, Pa., Jan. 23, 2019 — A highly controllable method that uses UV light to control particle motion and assembly within liquids could be used in drug delivery, chemical sensors, and fluid pumps. Developed by the Sen Lab at Pennsylvania State University, the new technique...
Next-Gen Semi Materials Could Be a Boost for Photovoltaics, Lighting ATLANTA, Jan. 17, 2019 — Next-generation semiconducting materials have the potential to transform lighting technology and photovoltaics, suggest researchers from the Georgia Institute of Technology (Georgia Tech), in a study of the unusual physics behind hybrid...
Engineers Perform Computational Logic with Optical and Electrical Signals TOKYO, Jan. 16, 2019 — In work that could help advance low-power, high-performance computer chips, researchers at the University of Tokyo and RIKEN have employed UV light and electric fields to perform logic operations with a chemical device. The use of electric fields...
Directed Currents Generated at THz Frequencies Are Higher Than Current Clock Rates BERLIN, Jan. 16, 2019 — Researchers at the Max Born Institute (MBI) generated directed electric currents at terahertz (THz) frequencies from light absorbed in semiconductor crystals. According to the researchers, this is a much higher frequency than the clock rates of...
New Additive Manufacturing Method Uses Light to Prevent Resin From Curing Against Vat ANN ARBOR, Mich., Jan. 14, 2019 — A new approach to 3D printing uses two-color irradiation of resin formulations that contain a photoinitiator and a photoinhibitor to perform vat-printing up to 100 times faster than conventional 3D printing processes, according to a team of...
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