Current Broadband News and Events

Current Broadband News and Events, Broadband News Articles.
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A sharper look at the interior of semiconductors
A research team at Friedrich Schiller University Jena (Germany) developed a high-resolution imaging method based on extreme short-wave UV light. It can be used to examine internal structures in semiconductors non-destructively, and with nanometre precision as the team reported in the current issue of the journal 'Optica'. (2021-02-16)

Wafer-scale production of graphene-based photonic devices
Graphene Flagship researchers have devised a wafer-scale fabrication method that paves the way to the next generation of telecom and datacom devices. (2021-02-11)

White turns into (extreme-)ultraviolet
Researchers from the Max Born Institute for Nonlinear Optics and Short Pulse Spectroscopy (MBI) have developed a new method to modify the spectral width of extreme-ultraviolet (XUV) light. By employing a novel phase-matching scheme in four-wave mixing, they could compress the spectral width of the initial broadband light by more than hundred times. The detailed experimental and theoretical results have been published in Nature Photonics. (2021-01-25)

Direct quantification of topological protection in photonic edge states at telecom wavelengths
Photonic topological insulators are currently at the forefront of on-chip photonic research due to their potential for loss-free information transport. Realized in photonic crystals, they enable robust propagation of optical states along domain walls. But how robust is robust? In order to answer this, researchers from TU Delft and AMOLF in the Netherlands quantified photonic edge state transport using phase-resolved near-field optical microscopy. The findings provide a crucial step towards error-free integrated photonic quantum networks (2021-01-18)

Towards Exawatt-class lasers
Researchers from Osaka University propose a concept for next-generation ultra-intense lasers, possibly increasing the current record from 10 Petawatts to 500 Petawatts. (2021-01-11)

Virtual therapy: The 'new normal' after COVID-19
The expansion of telepsychiatry may outlast the COVID-19 pandemic that caused it. When the stay-at-home order took effect in West Virginia, James Berry--a clinician with the WVU School of Medicine--was part of the team that moved the Chestnut Ridge Center's therapy sessions online. (2020-12-11)

Researchers demonstrate nondestructive mid-infrared imaging using entangled photons
Researchers have shown that entangled photons can be used to improve the penetration depth of optical coherence tomography (OCT) in highly scattering materials. The method represents a way to perform OCT with mid-infrared wavelengths and could be useful for non-destructive testing and analysis of materials such as ceramics and paint samples. (2020-12-10)

Army computer models unveil secret to quieter small drones
It's no secret the US Army wants its small unmanned aerial systems to operate quietly in densely-populated regions, but tests to achieve this can be expensive, time-consuming and labor-intensive according to researchers. (2020-12-03)

Tunable rainbow light trapping in ultrathin resonator arrays
Light squeezed into nanoscale metallic gaps has a myriad of applications in sensing, energy, and nonlinear optics. Recently, scientists at the University of Toronto have developed a new paradigm for the design of ultrathin metallic nanostructures which allows for precision tailoring to fit any desired application. This design strategy, coupled with a novel fabrication technique, provides a promising platform for the advancement of nanoscale optics. (2020-12-01)

Army researchers look to reduce rotorcraft noise
Imagine a silent helicopter stealthily moving troops and supplies around a future battlefield. U.S. Army researchers look to helicopter noise reduction technology as a top priority in aircraft design. At the U.S. Army Combat Capabilities Development Command, now known as DEVCOM, Army Research Laboratory, researchers collaborated with Uber and the University of Texas at Austin to investigate the acoustic properties of electric vertical takeoff and landing aircraft, which use distributed electric propulsion to power flight. (2020-12-01)

Headset over earphone: Cancelling out unnecessary and unwanted noise
Researchers from the Centre for Audio, Acoustics and Vibration at the University of Technology Sydney impacts for health and well-being of their 'virtual Active Noise Control/Cancellation (ANC) headphone (2020-11-29)

Researchers find conformational disorder tuning charge carrier mobility in 2D perovskites
Researchers from the University of Science and Technology of China synthesized a series of 2D organic-inorganic hybrid perovskites films with large organic spacer cations, and found that mobility and broadband emission showed strong dependence on the molecular conformational order of organic cations. (2020-11-23)

Moths strike out in evolutionary arms race with sophisticated wing design
Ultra-thin, super-absorbent and extraordinarily designed to detract attention, the wings of moths could hold the key for developing technological solutions to survive in a noisy world. (2020-11-23)

A trillion turns of light nets terahertz polarized bytes
Nanophotonics researchers at Rice University, the Polytechnic University of Milan and the Italian Institute of Technology have demonstrated a novel technique for modulating light at terahertz frequencies with plasmonic metasurfaces. (2020-10-19)

A flash of light to identify tumors: the results of the VIBRA project of the Politecnico di Milano
The VIBRA project, ''Very fast Imaging by Broadband coherent Raman'', has just ended at the Politecnico di Milano. Funded by the prestigious European Research Council of the European Community and lasted 5 years (2015-2020), it led to the development of a new revolutionary optical microscope in the biological and biomedical fields. (2020-10-16)

Turning excess noise into signal
Excess noise fluctuations of light are widely considered to be detrimental in optics and photonics. Here, scientists from the United States report that incoherent excess noise spectrally encodes broadband light, providing a unique tool to characterize spectrometers. With this tool, they improve spectrometer performance in visible light Optical Coherence Tomography. The resulting retinal images reveal a new and subtle photoreceptor band. This work motivates the search for other useful applications of excess noise. (2020-10-14)

New method uses noise to make spectrometers more accurate
Optical spectrometers are instruments with a wide variety of uses. By measuring the intensity of light across different wavelengths, they can be used to image tissues or measure the chemical composition of everything from a distant galaxy to a leaf. Now researchers at the UC Davis Department of Biomedical Engineering have come up a with a new, rapid method for characterizing and calibrating spectrometers, based on how they respond to ''noise.'' (2020-10-13)

Signals from distant stars connect optical atomic clocks across Earth for the first time
Using radio telescopes observing distant stars, scientists have connected optical atomic clocks on different continents. The results were published in the scientific journal Nature Physics by an international collaboration between 33 astronomers and clock experts at the National Institute of Information and Communications Technology (NICT, Japan), the Istituto Nazionale di Ricerca Metrologica (INRIM, Italy), the Istituto Nazionale di Astrofisica (INAF, Italy), and the Bureau International des Poids et Mesures (BIPM, France). (2020-10-08)

Two-dimensional optical spatial differentiation and high-contrast imaging
Scientists from China and America demonstrate broadband two-dimensional spatial differentiation and high-contrast edge imaging based on a dielectric metasurface. The edge detection method works for both intensity and phase objects simply by inserting the metasurface into a commercial optical microscope. This highly efficient metasurface performing a basic optical differentiation operation opens new opportunities in applications of fast, compactible and power-efficient ultrathin devices for data processing and biological imaging. (2020-10-03)

Colloidal quantum dot light emitters go broadband in the infrared
A team of ICFO researchers develops a new class of broadband solid state light emitter in the short-wave infrared that could be miniaturized, integrated with CMOS technology and used for many applications including food inspection, health or safety. (2020-09-30)

Thin and ultra-fast photodetector sees the full spectrum
Researchers have developed the world's first photodetector that can see all shades of light, in a prototype device that radically shrinks one of the most fundamental elements of modern technology. (2020-09-22)

Reaching 90% PL quantum yield in 1D metal halide by pressure-suppressed nonradiative loss
Here, we report a significant pressure-induced photoluminescence (PL) enhancement in a one-dimensional hybrid metal halide C4N2H14PbBr4, and the underlying mechanisms are investigated using in situ experimental characterization and first-principles calculations. Under a gigapascal pressure scale, the PL quantum yields (PLQYs) were quantitatively determined to show a dramatic increase from the initial value of 20% at ambient conditions to over 90% at 2.8 GPa. (2020-09-16)

Paving the way for tunable graphene plasmonic THz amplifiers
Tohoku University Professor Taiichi Otsuji has led a team of international researchers in successfully demonstrating a room-temperature coherent amplification of terahertz (THz) radiation in graphene, electrically driven by a dry cell battery. (2020-09-07)

COVID-19 exposes broadband gaps
The COVID-19 crisis has increasingly highlighted shortcomings in Australia's National Broadband Network, Flinders University experts say. With access to high-speed broadband (HSB) and the internet via the NBN now central to people's livelihoods, education, healthcare delivery and even social connections, the Flinders University researchers say the ''short-term politics of the 2013 federal election'' led to decisions which caused an expensive rollout and current problems with the network. (2020-08-28)

Nanodots made of photovoltaic material support waveguide modes
New spectroscopic technique for studying nanostructures demonstrates that stibnite nanodots can act as high-optical-quality waveguides and are promising candidates as photoswitchable materials for future applications (2020-08-26)

The MOF-based multicolor single-mode microlaser
Multi-color single-mode polarized micro-lasers with visible to near-infrared outputs are very potential in photonic integration and multimodal biochemical sensing/imaging and yet to realize. Recently, scientists in China combined methods of in-situ assembly and homogeneous epitaxy to hierarchically assemble dye molecules with different gain bands in a single metal-organic framework (MOF) microcrystal, successfully realizing the multicolor single-mode polarized micro-laser with emission from green to near infrared. (2020-08-18)

Ultrafast hydrogen bond dynamics of liquid water revealed by THz-induced Kerr effect
Hydrogen bond dynamics in water has always been mysterious, and it is the basis for understanding the behavior of matter in the water environment. Chinese scientists found that applying a broadband terahertz pulse to a free-flowing water film will enhance the relatively weak intermolecular hydrogen bond motion, allowing us to observe ultrafast vibration characteristics on the order of sub-picoseconds. This method can be used to study the complex interaction of reagents with solvent water molecules. (2020-08-18)

Organic chemistry -- a brilliant tool
An international team led by the chemist Heinz Langhals of LMU Munich succeeded in molecular deflection of light radiation by means of Diamantane. Novel applications such as efficient light collectors or broadband light absorbers are promising. (2020-08-14)

Tiniest secrets of integrated circuits revealed with new imaging technique
The secrets of the tiniest active structures in integrated circuits can be revealed using a non-destructive imaging technique, shows an international team of scientists from JKU and Keysight Technologies (Austria), ETH/EPFL/PSI and IBM Research - Europe (Switzerland) and from UCL (UK). (2020-08-05)

Energy demands limit our brains' information processing capacity
Our brains have an upper limit on how much they can process at once due to a constant but limited energy supply, according to a new UCL study using a brain imaging method that measures cellular metabolism. (2020-08-03)

Engineering: Reducing noise transmitted through an open window
A new device that can reduce the intensity of sound passing through open windows is presented in a proof-of-principle study in Scientific Reports. It fits into a two-panel sliding window and can decrease the perceived loudness of urban transportation noises by up to half (10 decibel reduction). (2020-07-09)

Cooling mechanism increases solar energy harvesting for self-powered outdoor sensors
Thermoelectric devices, which use the temperature difference between the top and bottom of the device to generate power, offer some promise for harnessing naturally occurring energy. In Applied Physics Letters, authors tested one made up of a wavelength-selective emitter that constantly cools the device during the day using radiative cooling. As a result, the top of the device is cooler than the bottom, causing a temperature difference that creates constant voltage through day and night. (2020-07-07)

Liquid crystal integrated metalens for versatile color focus
A research team from Nanjing University recently demonstrated active manipulation of chromatic dispersion, achieving achromatic focusing within a designated broadband. (2020-07-06)

Scientists propose data encoding method for the 6G standard
A group of scientists from ITMO University have demonstrated the possibility of modifying terahertz pulses in order to use them for data transmission. (2020-06-11)

Australia's ancient geology controls the pathways of modern earthquakes
New research near Uluru in Australia's arid centre shows that rock structures formed deep within the ancient Gondwana supercontinent controlled the rupture pathways of one of Australia's largest modern earthquakes. (2020-06-04)

A remote control for neurons
A team led by researchers at Carnegie Mellon University has created a new technology that enhances scientists' ability to communicate with neural cells using light. Tzahi Cohen-Karni, associate professor of biomedical engineering and materials science and engineering, led a team that synthesized three-dimensional fuzzy graphene on a nanowire template to create a superior material for photothermally stimulating cells. (2020-06-01)

Scientists measured electrical conductivity of pure interfacial water
Skoltech scientists in collaboration with researchers from the University of Stuttgart, the Karlsruhe Institute of Technology and the Russian Quantum Center achieved the first systematic experimental measurements of the electrical conductivity of pure interfacial water, hence producing new results significantly extending our knowledge of interfacial water. (2020-05-07)

Fiber optics capture seismic signatures of the rose parade
Interesting signatures of the Rose Parade were captured by fiber optic telecommunications cable lying below the parade route. In Seismological Research Letters, Zhongwen Zhan of the California Institute of Technology and colleagues describe how they converted these dark or 'unused' fibers within cables into a dense seismic array. (2020-05-06)

COVID-19 limitations unique opportunity for researchers to decrease digital divide
The COVID-19 shelter-in-place orders and other limitations could offer researchers the chance to use technology to decrease the digital divide and disparities in academic research. (2020-04-29)

Breaking the size and speed limit of modulators: The workhorses of the internet
Researchers developed and demonstrated for the first time a silicon-based electro-optical modulator that is smaller, as fast as and more efficient than state-of-the-art technologies. (2020-04-13)

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