A research team from ITMO University and the Australian National University has discovered that different metasurfaces exhibit the same behavior provided a symmetry breaking is introduced to their unit cells 'meta-atoms'. Asymmetry of meta-atoms results in high-quality (high Q) resonances in the transmittance spectra of metasurfaces. It opens the way to control an optical response, which is highly desirable for practical applications. The results of this research were published in Physical Review Letters.
In a paper published Oct. 8 in the journal Nano Letters, a team from the University of Washington and the National Tsing Hua University in Taiwan announced that it has constructed functional metalenses that are one-tenth to one-half the thickness of the wavelengths of light that they focus. Their metalenses, which were constructed out of layered 2D materials, were as thin as 190 nanometers -- less than 1/100,000ths of an inch thick.
Using microstructured layers, an HZB team has been able to increase the efficiency of perovskite-silicon tandem solar cells, achieving 25.5 %, which is the highest published value to date. At the same time, computational simulations were utilized to investigate light conversion in various device designs with different nanostructured surfaces. This enabled optimization of light management and detailed energy yield analyses. The study has now been published in Energy & Environmental Science.
The most common test for glaucoma can underestimate the severity of the condition by not detecting the presence of central vision loss, also known as macular degeneration, according to a new Columbia University study.
Excited photo-emitters can cooperate and radiate simultaneously, a phenomenon called superfluorescence. Researchers from Empa and ETH Zurich, together with colleagues from IBM Research Zurich, have recently been able to create this effect with long-range ordered nanocrystal superlattices. This discovery could enable future developments in LED lighting, quantum sensing, quantum communication and future quantum computing. The study has just been published in the renowned journal Nature.
Laser-based 'optical tweezers' could levitate uranium and plutonium particles, thus allowing the measurement of nuclear recoil during radioactive decay. This technique, proposed by scientists at Los Alamos National Laboratory, provides a new method for conducting the radioactive particle analysis essential to nuclear forensics
Stanford researchers retooled an electron microscope to work with visible light and gas flow, making it possible to watch a photochemical reaction as it swept across a nanoparticle the size of a single cold virus.
Researchers created the world's most powerful electromagnetic pulses to control a data-storage material's physical form, leading to a potential way to scale down memory devices and revolutionize how computers handle information.
Many of today's methods of purifying water rely on filters and chemicals that need regular replenishing or maintenance. Millions of people, however, live in areas with limited access to such materials, leading the research community to explore new options of purifying water in using plasmas. Many plasma-based approaches are expensive, but a new class of plasma devices may change that. Researchers at the have been studying a new type of plasma generator for water purification.
New materials are being synthesized by twisting and stacking atomically thin layers. To bring it all under one roof, physicists Nathaniel Gabor of UC Riverside, and Justin C. W. Song of Nanyang Technological University, Singapore, propose this field of research be called "electron quantum metamaterials." They have just published a perspective article in Nature Nanotechnology, in which they highlight the potential of engineering synthetic periodic arrays with feature sizes below the wavelength of an electron.