Researchers from the Massachusetts Institute of Technology's Lincoln Laboratory report using two different laser-based methods to transmit various tones, music and recorded speech at a conversational volume
The Polymerisation Process research group of the POLYMAT institute of the UPV/EHU-University of the Basque Country has managed to efficiently encapsulate semiconductor nanocrystals or quantum dots of various sizes into polymer particles; great stability in terms of their optical properties and good fluorescence control when combining different quantum dots have been achieved. The possible applicability of these materials as sensors of volatile organic compounds has also been explored.
Physicists from Immanuel Kant Baltic Federal University (BFU) developed and applied a method of identifying microplastic collected in sea waters. The spectroscopy method allows to determine the chemical composition of contaminants regardless of their size. The article about the research was published in Marine Pollution Bulletin.
Researchers from the Harvard John A. Paulson School of Engineering and Applied Sciences (SEAS) have developed a polarization-insensitive metalens that can achromatically focus light across the visible spectrum without aberrations. This flat lens could be used for everything from virtual or augmented reality headsets to microscopy, lithography, sensors, and displays.
When molecules interact with the oscillating field of a laser, an instantaneous, time-dependent dipole is induced. This very general effect underlies diverse physical phenomena. Now scientists from the Max Born Institute for Nonlinear Optics and Short Pulse Spectroscopy (MBI) report on an experiment in the Journal of Physical Chemistry Letters, where the dependence of the driven-dipole response on the bound state of an electron in a methyl iodine molecule is revealed.
Fluorescent tagging of cellular proteins has allowed unprecedentedly detailed images of brain circuits, but imaging neurons and synapses over large areas in fine detail is difficult. Researchers at HHMI, UC Berkeley and MIT have joined two techniques -- expansion microscopy and lattice light-sheet microscopy -- to capture neural circuits, including all synapses, in a whole fly brain in only three days, versus up to 10 years for EM whole-brain imaging. This allows rapid study of brain circuits.
In a new paper published in the journal Optica, the flagship journal of the Optical Society, researchers at the Advanced Science Research Center (ASRC) at The Graduate Center of The City University of New York (CUNY) lay out a rigorous theoretical framework that clarifies the fundamental principles governing resonant nonreciprocal circuits and resolves some outstanding questions on their potentials and limitations.
A new, more sensitive method to measure ultrasound may revolutionize everything from medical devices to unmanned vehicles. Researchers at The University of Queensland have combined modern nanofabrication and nanophotonics techniques to build the ultra precise ultrasound sensors on a silicon chip.
The Einstein-de Haas effect, first demonstrated more than a century ago, provides an intriguing link between magnetization and rotation in ferromagnetic materials. An international team led by ETH physicist Steven Johnson now established that the effect has also a central role in ultrafast processes that happen at the sub-picosecond timescale -- and thus deliver fresh insight into materials that might form the basis for novel devices.
One of the most important aims of contemporary scientific research is finding out what makes the production of entropy predominate. This aim explains the current interest in studying mesoscopic systems, which are not as small as individual atoms but nevertheless display well-defined quantum behavior.