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Current Broadband News and Events, Broadband News Articles.
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Broad spectrum
Digital cameras as well as many other electronic devices need light-sensitive sensors. In order to cater for increasing demand for optoelectronic components, industry is searching for new semiconductor materials. They are not only supposed to cover a broad range of wavelengths but should also be inexpensive. A hybrid material, developed in Dresden, fulfils both these requirements. Himani Arora, a PhD student at HZDR, demonstrated that this metal-organic framework can be used as a broadband photodetector. (2020-04-09)

Scientists find a way to extract color from black
Scientists have developed a way of extracting a richer palette of colors from the available spectrum by harnessing disordered patterns inspired by nature that would typically be seen as black. (2020-03-27)

Ultrafast and broadband perovskite photodetectors for large-dynamic-range imaging
A solution-processed broadband photodetector based on organic-inorganic hybrid perovskite and organic bulk heterojunction has been demonstrated, achieving broadband response spectra up to 1000 nm with a high EQE in the NIR region, an ultrafast response speed of 5.6 ns and a wide linear dynamic range of 191 dB. Encouragingly, due to the high-dynamic-range imaging capacity, high-quality visible-NIR actual imaging is obtained, enabling the accelerated translation of solution-processed photodetector applications from the laboratory to the imaging market (2020-03-23)

Pushing periodic disorder induced phase-matching into deep-ultraviolet spectral region
Phase matching condition is the key criteria for the efficient nonlinear frequency conversion. Here, Scientists in China employed an additional periodic phase (APP) technique to meet the phase-matching condition in quartz crystal and experimentally demonstrated the efficient nonlinear frequency conversion from visible to deep-ultraviolet spectral region. The APP theory and generated visible to deep-ultraviolet radiation would revolutionize the next-generation nonlinear photonics and their further applications. (2020-03-23)

Peppered with gold
Terahertz waves are becoming more important in science and technology. But generating these waves is still a challenge. A team at Helmholtz-Zentrum Dresden-Rossendorf (HZDR), TU Dresden and University of Konstanz has now developed a germanium component that generates short terahertz pulses with an advantageous property: the pulses have an extreme broadband spectrum and thus deliver many different terahertz frequencies at the same time. The development promises a broad range of applications in research and technology. (2020-03-16)

Virtualized metamaterials opens door for acoustics application and beyond
Scientists from the Hong Kong University of Science and Technology (HKUST) have realized what they called a virtualized acoustic metamaterial, in digitizing material response to an impulse response stored in a software program. (2020-03-03)

A joint venture at the nanoscale
Scientists at Argonne National Laboratory report fabricating and testing a superconducting nanowire device applicable to high-speed photon counting. This pivotal invention will allow nuclear physics experiments that were previously thought impossible. (2020-03-03)

New research sheds light on the unique 'call' of Ross Sea killer whales
New Curtin University-led research has found that the smallest type of killer whale has 28 different complex calls, comprising a combination of burst-pulse sounds and whistles, which they use to communicate with family members about the changing landscape and habitat. (2020-02-26)

Broadband transmission-type coding metasurface for electromagnetic beam forming and scanning
In a recent work, a novel design of broadband and transmission-type digital coding metasurface is proposed by using two types of multi-layer digital particles with different geometrical parameters, which is valid in 8.1-12.5 GHz while satisfies the requirements of 1-bit coding. The designed metasurface can achieve beam forming and scanning by arranging different digital coding sequences, which is expected to have more potential applications in radar and communication systems. (2020-02-14)

Compact broadband acoustic absorber with coherently coupled weak resonances
Recently, the research teams from Tongji University and The Hong Kong Polytechnic University demonstrate that a compact broadband acoustic absorber can be achieved with coherently coupled 'weak resonances' (resonant sound absorbing systems with low absorption peaks). (2020-01-16)

Color superlensing to assist in surpassing diffraction barrier
The research was supported by a Russian Science Foundation's grant under the title 'Synthesis and research of a new class of nanocomposite ceramics with degenerate dielectric permeability for opto-plasmonic applications.' (2020-01-03)

Demonstration of ultrafast and energy-efficient all-optical switching with graphene and plasmonic waveguides
Nippon Telegraph and Telephone Corporation and Tokyo Institute of Technology have demonstrated an ultrafast all-optical switching operation with the lowest energy consumption ever reported for all-optical switching at less than one picosecond (one trillionth of a second). The current achievement combines an ultrasmall optical waveguide with a height and width of a few dozen nanometers, called a plasmonic waveguide1, with graphene2, a material that shows great promise for nonlinear optics. (2019-12-12)

All-optical diffractive neural networks process broadband light
Developed by researchers at UCLA, diffractive optical networks provide a low power, low latency and highly-scalable machine learning platform that can find numerous applications in robotics, autonomous vehicles, defense industry, among many others. In addition to providing statistical inference and generalization to classes of data, diffractive neural networks have also been used to design deterministic optical systems such as a thin imaging system. (2019-12-04)

Rethinking the role of technology in the classroom
Introducing tablets and laptops to the classroom has certain educational virtues, according to Annahita Ball, an assistant professor in the University at Buffalo School of Social Work, but her research suggests that tech has its limitations as well. ''You can't simply throw technology at kids and expect positive outcomes,'' says Ball, an expert in educational justice and school social work whose new study shows a decrease in academic motivation for students who participated in a technology-based intervention. (2019-10-22)

Compute at the speed of light
A new way to achieve integrated photonics--a new device has been developed at the University of Delaware that could have applications in imaging, sensing and quantum information processing, such as on-chip transformation optics, mathematical operations and spectrometers. (2019-09-26)

Using lasers to study explosions
An explosion is a complex event involving quickly changing temperatures, pressures and chemical concentrations. A special type of infrared laser, known as a swept-wavelength external cavity quantum cascade laser, can be used to study explosions. This versatile instrument has a broad wavelength tuning range that allows the measurement of multiple chemical substances in an explosive fireball. The ability to measure and monitor the dramatic changes during explosions could help scientists understand and even control them. (2019-09-03)

Strong storms also play big role in Antarctic ice shelf collapse
Warming temperatures and changes in ocean circulation and salinity are driving the breakup of ice sheets in Antarctica, but a new study suggests that intense storms may help push the system over the edge. (2019-07-18)

Mapping industrial 'hum' in the US
Using a dense sensor network that scanned the United States between 2003 and 2014, researchers have identified areas within the country marked by a persistent seismic signal caused by industrial processes. (2019-04-26)

More children for the high educated: Broadband Internet creates a digital fertility divide
Access to broadband Internet has a positive effect on fertility, overall life satisfaction and time spent with children. Since this effect is largely driven by higher-educated women, though, it risks to create another digital divide, according to a study by Francesco Billari and Luca Stella (Bocconi University), with Osea Giuntella (University of Pittsburgh), just published in Population Studies. (2019-04-02)

New measurement method for radioactive methane
The method developed by Juho Karhu in his PhD thesis work is a first step towards creating a precise measuring device. (2019-03-20)

New quantum sensor could improve cancer treatment
A new quantum sensor developed by researchers at the University of Waterloo's Institute for Quantum Computing has proven it can outperform existing technologies and promises significant advancements in long-range 3D imaging and monitoring the success of cancer treatments. (2019-03-04)

Chirality in 'real-time'
Distinguishing between left-handed and right-handed ('chiral') molecules is crucial in chemistry and the life sciences, and is commonly done using a method called circular dichroism. However, during biochemical reactions the chiral character of molecules may change. EPFL scientists have for the first time developed a method that uses ultrashort deep-ultraviolet pulses to accurately probe such changes in real-time in (bio)molecular systems. (2019-01-10)

When AI and optoelectronics meet: Researchers take control of light properties
Researchers from INRS and the University of Sussex customize the properties of broadband light sources using an AI algorithm and a photonic chip. (2018-11-20)

Resonant mechanism discovery could inspire ultra-thin acoustic absorbers
New research led by academics at the University of Bristol has discovered that the scales on moth wings vibrate and can absorb the sound frequencies used by bats for echolocation (biological sonar). The finding could help researchers develop bioinspired thin and lightweight resonant sound absorbers. (2018-11-12)

Physicists create new, simpler-than-ever quantum 'hard drive for light'
Physicists at the University of Alberta in Canada have developed a new way to build quantum memories, a method for storing delicate quantum information encoded into pulses of light. (2018-11-05)

New technology to allow 100-times-faster internet
This world-first nanophotonic device, unveiled in Nature Communications, encodes more data and processes it much faster than conventional fiber optics by using a special form of 'twisted' light. (2018-10-24)

Broadband internet causes sleep deprivation, a new study finds
Individuals with DSL access tend to sleep 25 minutes less than their counterparts without DSL Internet. They are significantly less likely to sleep between 7 and 9 hours, the amount recommended by the scientific community, and are less likely to be satisfied with their sleep, Bocconi University's Francesco Billari and colleagues find. The effect is largely driven by individuals that face time constraints in the morning and by the use of electronic devices in the evening (not by their use throughout the day) (2018-08-02)

On-chip optical filter processes wide range of light wavelengths
MIT researchers have designed an optical filter on a chip that can process optical signals from across an extremely wide spectrum of light at once, something never before available to integrated optics systems that process data using light. The technology may offer greater precision and flexibility for designing optical communication and sensor systems, studying photons and other particles through ultrafast techniques, and in other applications. (2018-08-01)

Urban geophone array offers new look at northern Los Angeles basin
Using an array of coffee-can sized geophones deployed for about a month in backyards, golf courses and public parks, researchers collected enough data to allow them to map the depth and shape of the San Gabriel and San Bernardino sedimentary basins of Los Angeles, California. (2018-07-31)

100 times faster broadband is coming: 5G passes first test at University of Sussex
Initial testing on the next generation of mobile technology with the capability of delivering 100 times faster broadband has been successful, engineers at the University of Sussex and collaborators from telecom consultancy firm Plum have confirmed. (2018-07-04)

New experimental results from the largest and most sophisticated stellerator
An international team is running tests on the largest and most sophisticated stellerator, the Wendelstein 7-X fusion experiment. This complex machine is housed at the Max-Planck-Institute of Plasma Physics, and researchers are analyzing data from the first experiment campaign that took place in 2016, hoping to understand the science of fusion reactors. In Physics of Plasmas, the scientists recount the first detailed characterization of plasma turbulence at the outer edge of the stellerator. (2018-07-03)

Spectral cloaking could make objects invisible under realistic conditions
Researchers and engineers have long sought ways to conceal objects by manipulating how light interacts with them. A new study offers the first demonstration of invisibility cloaking based on the manipulation of the frequency (color) of light waves as they pass through an object, a fundamentally new approach that overcomes critical shortcomings of existing cloaking technologies. (2018-06-28)

Study explores options that optimize profit in broadband satellite constellations
Several large telecommunications companies have proposed plans to provide global broadband services by launching hundreds and even thousands of satellites into orbit. Although broadband for everyone sounds like a great idea, it also carries great financial risk, resulting in bankruptcy for some who've tried it. Recent research at the University of Illinois suggests a more cost-effective strategy using regional coverage and staged deployment. (2018-06-06)

First chip-scale broadband optical system that can sense molecules in the mid-IR
Researchers at Columbia Engineering have demonstrated, for the first time, a chip-based dual-comb spectrometer in the mid-infrared range, that requires no moving parts and can acquire spectra in less than 2 microseconds. The system, which consists of two mutually coherent, low-noise, microresonator-based frequency combs spanning 2600 nm to 4100 nm, could lead to the development of a spectroscopy lab-on-a-chip for real-time sensing on the nanosecond time scale. (2018-05-23)

Monitoring the tremble -- and potential fall -- of natural rock arches
Scientists monitoring the vibrations of natural rock arches have found that the resonant frequencies of arches undergo dynamic changes from day to day, according to research presented at the 2018 SSA Annual Meeting. (2018-05-15)

Attosecond physics: Molecules brilliantly illuminated
A new high-power laser system generates ultrashort pulses of light covering a large share of the mid-infrared spectrum. (2018-04-23)

Prototype of most advanced quantum memory presented by two Kazan universities
In this paper we experimentally demonstrated a broadband scheme of the multiresonator quantum memory-interface. The microwave photonic scheme consists of the system of mini-resonators strongly interacting with a common broadband resonator coupled with the external waveguide. We have implemented the impedance matched quantum storage in this scheme via controllable tuning of the mini-resonator frequencies and coupling of the common resonator with the external waveguide. (2018-04-11)

Optical distance measurement at record-high speed
Scientists of Karlsruhe Institute of Technology (KIT) and École polytechnique fédérale de Lausanne (EPFL) have demonstrated the fastest distance measurement so far. The researchers demonstrated on-the-fly sampling of a gun bullet profile with micrometer accuracy. The experiment relied on a soliton frequency comb generated in a chip-based optical microresonator made from silicon nitride. Potential applications comprise real-time 3D cameras based on highly precise and compact LIDAR systems. DOI: 10.1126/science.aao3924 (2018-02-26)

Attosecond physics: A keen sense for molecules
Munich based Laser physicists have developed an extremely powerful broadband infrared light source. This light source opens up a whole new range of opportunities in medicine, life science, and material analysis. (2018-02-23)

Forging a quantum leap in quantum communication
The major drawback of quantum communication today is the slow speed of data transfer, which is limited by the speed at which the parties can perform quantum measurements. Researchers at Bar-Ilan University have devised a method that overcomes this (2018-02-09)

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