Phys.org March 27, 2019 An international team of researchers (China, Singapore) used a negative resistor network with active elements to achieve the remote function of the DC cloak. Based on this network, the cloak can remotely generate a hidden region without distorting the currents far from the cloaked region. The experimental results show that any object in the hidden region is invisible to a DC detector. The cloak does not require any knowledge of the hidden object. The cloaking device may find potential applications in medical or geologic research…read more. Open Access TECHNICAL ARTICLE
Tag Archives: Sensors
Waterproof graphene electronic circuits
Science Daily January 30, 2019 Water molecules change the electrical resistance of this carbon material, which introduces a false signal into the sensor. An international team of researchers (Sweden, Germany) discovered that when this two-dimensional material is integrated with the metal of a circuit, contact resistance is not impaired by humidity. They used graphene together with gold metallization and silica substrates in transmission line model test structures, as well as computer simulations to demonstrate their discovery. As part of the European CO2-DETECT project, they are applying this new approach to create the first prototypes of graphene-based sensors to measure carbon […]
New T-wave detector uses waves of the electronic sea in graphene
Nanowerk December 21, 2018 It has proven challenging to implement plasmonic devices operating at terahertz frequencies. An international team of researchers (UK, Russia, Japan) has demonstrated plasmon-assisted resonant detection of terahertz radiation by antenna-coupled graphene transistors that act as both plasmonic Fabry-Perot cavities and rectifying elements. By varying the plasmon velocity using gate voltage, they could tune the detectors between multiple resonant modes. The devices offer a convenient tool for further plasmonic research and promise a viable route for various photonic applications… read more. Open Access TECHNICAL ARTICLE
New technique to make objects invisible proposed
Eurekalert November 26, 2018 Most of the techniques for cloaking harness the extraordinary properties of certain materials to make light circumvent the object to be made invisible. An international team of researchers (Spain, Italy) has developed a technique using the electromagnetic properties of specific materials which can make certain objects invisible when they are introduced as fillers. This plasmonic cloaking makes the object and the filler jointly invisible. The method makes it possible to achieve invisibility from the interior of an object without using any external device and allows the object to interact with its environment without being hampered by […]
Physicists design new antenna for next-generation super-sensitive magnetometers
Phys.org November 6, 2018 Ensembles of nitrogen-vacancy color centers in diamond hold promise for ultra-precise magnetometery, competing with superconducting quantum interference device detectors. By utilizing the advantages of dielectric materials, such as very low losses for electromagnetic field, with the potential for creating high-quality factor resonators with strong concentration of the field within it, researchers in Russia implemented a dielectric resonator antenna for coherent manipulation of a large ensemble of nitrogen-vacancy centers in diamond. Research enables use of large volume low nitrogen-vacancy concentration diamond plates in modern nitrogen-vacancy magnetometers thus improving sensitivity via larger coherence time and higher optical detected […]
Honing quantum sensing
MIT News September 25, 2018 Extreme sensitivity of quantum sensors to their surrounding environment creates the vexing problem of environmental noise in quantum sensor systems. A team of researchers in the US (MIT, Yale University) has developed an approach that is complementary to existing Dynamical decoupling and established error-corrected quantum sensing (ECQS) methods. This approach allows frequency-independent filtering, because it exploits spatial rather than temporal noise correlations. The new ECQS scheme makes use of noise correlations at different positions in a quantum sensor. In this way, the new approach can tell signal from noise even in the common case where […]
Scientists reduced the weight of optics for satellite observation by 100 times
Eurekalert August 8, 2018 Researchers in Russia have created an optical element for reconstructing images taken with diffractive optics on a satellite. It weighs only 5 grams and replaces a complex and massive system of lenses and mirrors similar to the one that is used in telephoto lenses with a focal length of 300 mm and a weight of 500 grams. They proposed to compensate for distortions with the use of digital processing. The computational reconstruction developed by them includes colour correction of the image and elimination of chromatic blurring using convolutional neural networks (CNN). The compact system is particularly […]
A single photon detection system for the spectrum range up to 2300 nm
Arxiv July 11. 2018 An international team of researchers (Russia, Poland) has demonstrated niobium nitride based superconducting single-photon detectors are sensitive in the spectral range 457 nm – 2300 nm. The system performance was tested in a real-life experiment with correlated photons generated by means of spontaneous parametric down conversion, where one of photon was in the visible range and the other was in the infrared range. They measured a signal to noise ratio as high as 4×104 in their detection setting. A photon detection efficiency as high as 64 % at 1550 nm and 15 % at 2300 nm […]
Electronic stickers to streamline large-scale ‘Internet of Things’
Purdue University July 16, 2018 Researchers at Purdue University developed a wafer-recyclable, environment-friendly transfer printing process that enables the wafer-scale separation of high-performance thin-film nanoelectronics in a defect-free manner that enables multiple reuses of the wafer. The interfacial delamination is enabled through a controllable cracking phenomenon in a water environment at room temperature. The technique cuts down manufacturing costs by using a single wafer to build a nearly infinite number of thin films. The film can peel off at room temperature… read more. TECHNICAL ARTICLE
Quantum-enhanced sensing of magnetic fields
Science Daily July 2, 2018 Transmon qubit is currently one of the leading candidates for a building block of large-scale quantum computers. An international team of researchers (Finland, Switzerland, Russia) has constructed an artificial atom with an intrinsic magnetic moment that is around 100’000 times larger than that of natural atoms or ions. The coupling of large moment to an external magnetic field makes it possible to accurately measure the strength of the field. The combination of harnessing quantum hardware and quantum algorithms in the context of quantum sensing provides an appealing route towards novel devices that, ultimately, promise to […]