Phys.org April 1, 2024 A direct analog of frequency combs in the magnonic systems has not been demonstrated to date. Researchers in China generated a new magnonic frequency comb in the resonator with giant mechanical oscillations through the magnomechanical interaction. It contained up to 20 comb lines, which were separated by the mechanical frequency of 10.08 MHz. The thermal effect based on the strong pump power induced the cyclic oscillation of the magnon frequency shift, which led to a periodic oscillation of the magnonic frequency comb. They demonstrated the stabilization and control of the frequency spacing of the magnonic frequency […]
Tag Archives: Metrology
‘Nanometrology lab on a chip’ within reach thanks to new compact, optical sensor
Nanowerk May 20, 2020 On-chip compact and integrated optical motion sensing micro- and nano-optomechanical platforms that typically exploit narrow spectral resonances require tunable lasers with narrow linewidth and low spectral noise, which makes the integration of the read-out extremely challenging. Researchers in the Netherlands report a step towards the practical application of nanomechanical sensors, by presenting a sensor with ultrawide (∼80 nm) optical bandwidth. It is based on a nanomechanical, three-dimensional directional coupler with integrated dual-channel waveguide photodiodes and displays small displacement imprecision as well as large dynamic range (>30 nm). The broad optical bandwidth releases the need for a tunable laser […]
A technique to measure mechanical motion beyond the quantum limit
Phys.org November 20, 2019 Through the interaction of the mechanical oscillator with a microwave (or optical) cavity, back-action evading measurement in principle enables noiseless measurement of the position of the mechanical oscillator. However, additional interactions between the microwave (or optical) field and the mechanical oscillator lead to instabilities in mechanical motion, which prevents continuous measurement. Through simultaneous but unequal electromechanical amplification and cooling processes, a team of researchers in the US (industry, University of Colorado, NIST) created a method for a nearly noiseless pulsed measurement of mechanical motion. The conversion of signals between these two disparate frequency bands is important […]
Sensors and metrology as the driving force for digitalization
Fraunhofer Research News June 19, 2019 Researchers in Germany will be presenting the results of their research into sensor technology and its applications in the field of testing and measurement at Sensor+Test 2019, a forum for sensor and measurement technology. They will demonstrate how the quality of workpieces and components can be assured using a non-contact, non-destructive test method based on audio sensing of product and process parameters combined with machine learning. The nanoSPECTRAL technology developed by Fraunhofer IIS is based on optical nanostructures and enables a very cost-effective monolithic production of the required optical filters directly in CMOS semiconductor […]
Device that ‘shakes’ light a breakthrough In photonics
Nanowerk March 12, 2019 The nonlinear optical effects which used for manipulating photon frequency are weak and require a very strong laser, which creates “noise”. To better control light particles researchers at Yale University have created a device that consists of a series of waveguides. Light and microwave sent through the device wends its way through alternating suspended and clamped waveguides on a single chip. This creates a positive and negative effect, corresponding to the microwave. The light spirals in each of the waveguides to prolong the interaction and maximize efficiency. The deeper the modulation, the better you can control […]
Innate ‘fingerprint’ could detect tampered steel parts
Science Daily November 28, 2018 All materials typically display some variation in their microstructure simply as a result of the manufacturing process, thus providing the potential that Barkhausen noise measurements between nominally similar components will be unique. Researchers at the Los Alamos National Laboratory have demonstrated that Barkhausen noise measurements are both repeatable in time for a single sample made from a ferromagnetic material, and unique across several instances of nominally similar samples. As the method inherently results in a time series measurement at each point on a sample, it is expected to have far higher dimensionality than physically similar […]
Russian scientists develop high-precision laser for satellite navigation
Phys.org October 3, 2018 Researchers in Russia have developed a laser for a lunar locator capable of measuring the distance to the moon with a margin of error of a few millimeters. The laser has a relatively small size, low radiation divergence and a unique combination of short pulse duration, high pulse energy and high pulse repetition rate and the laser pulse duration is 64 picoseconds, which is almost 16 billion times less than one second. The laser’s beam divergence, which determines radiation brightness at large distances, is close to the theoretical limit. The new laser will be used in […]
Entangled atoms shine in unison
Phys.org May 18, 2018 A team of international researchers (Austria, Australia, Czech Republic) compared the photon interference produced by entangled and non-entangled barium atoms. The measured difference of the interference fringes directly corresponds to the amount of entanglement in the atoms which helps to characterize the entanglement fully optically. They demonstrated that the interference signal is highly sensitive to environmental factors at the location of the atoms. The demonstration could lead to the development of highly sensitive optical gradiometers for the precise measurement of the gravitational field or the Earth’s magnetic field… read more. TECHNICAL ARTICLE