A5051525727- Superconducting and THz Device Technology
- Physics of Superconductivity and Magnetism
- Photonic and Optical Devices
- Advanced Optical Sensing Technologies
- Thermal Radiation and Cooling Technologies
- Advanced Fiber Laser Technologies
- Semiconductor Quantum Structures and Devices
- Quantum Information and Cryptography
- Calibration and Measurement Techniques
- Mechanical and Optical Resonators
- Radio Astronomy Observations and Technology
- Spectroscopy and Laser Applications
- Advanced Fluorescence Microscopy Techniques
- Advanced Semiconductor Detectors and Materials
- Terahertz technology and applications
- Optical Coatings and Gratings
- Ionosphere and magnetosphere dynamics
- Quantum and electron transport phenomena
- Orbital Angular Momentum in Optics
- Analytical Chemistry and Sensors
- Quantum optics and atomic interactions
- Magnetic confinement fusion research
- Adaptive optics and wavefront sensing
- Optical Wireless Communication Technologies
- Advanced Electrical Measurement Techniques
Russian Quantum Center
2024
University of Glasgow
2018-2024
National University of Science and Technology
2016-2017
National University of Science and Technology
2016
Cardiff University
2007-2016
Kurchatov Institute
2004-2014
Moscow State Pedagogical University
2004-2013
Delft University of Technology
2009-2013
Moscow Institute of Physics and Technology
2013
National Research University Higher School of Economics
2013
In this work, we show a proof-of-principle benchtop single-photon light detection and ranging (LIDAR) depth imager at 2.3µm, utilizing superconducting nanowire detectors (SNSPDs).We fabricate fiber-couple SNSPDs to exhibit enhanced photon counting performance in the mid-infrared.We present characterization results using an optical parametric oscillator source deploy these scanning LIDAR setup 2.3µm wavelength.This demonstrates viability of for future free-space applications mid-infrared...
Our results show a viable route to free-space quantum-secured communication in an unexplored atmospheric transparency window.
The ability to detect individual light quanta – single photons is prized across many fields of physics from astronomy quantum optics. Superconducting photon detectors offer exceptional performance in terms sensitivity, spectral range and timing resolution. In this review, we introduce the underlying absorption superconducting devices. We then present detailed case studies contemporary detector technologies for counting at visible infrared wavelengths. conclude with a perspective on future...
There is growing interest in refractory metal thin films for a range of emerging nanophotonic applications, including high temperature plasmonic structures and infrared superconducting single photon detectors.We present detailed comparison optical properties key representative materials this class (NbN, NbTiN, TiN MoSi) with texture varying from crystalline to amorphous.NbN, NbTiN MoSi have been grown an ultra-high vacuum sputter deposition system on silicon substrates at room...
We report on the direct measurement of electron-phonon relaxation time, τeph, in disordered TiN films. Measured values τeph are from 5.5 ns to 88 4.2 1.7 K temperature range and consistent with a T−3 dependence. The electronic density states at Fermi level N0 is estimated measured material parameters. presented results confirm that thin films promising candidate-materials for ultrasensitive superconducting detectors.
The injection of high-pressure supersonic jets into the tokamak plasma is considered a promising method future thermonuclear reactor fuelling and as tool for disruption mitigation. Successful experiments were correspondingly performed on Tore Supra DIII-D. In present paper evolution such jet analysed. expansion, deceleration ambient electrons ions by jet, self-consistent electric field, elementary processes, radiation adiabatic cooling are taken account. simulated MHD code, which similar to...
The next generation of far infrared space observatories will require extremely sensitive detectors that can be realized only by combining low intrinsic noise with high optical efficiency. We have measured the broad-band response ultra-sensitive TES bolometers (NEP$\approx2\rm\ aW/\sqrt Hz$) in 30--60-$\mu\rm m$ band where radiation is coupled to a few-moded conical feedhorn and hemispherical backshort. show these an efficiency 60% (the ratio power detected bolometer total propagating through...
We report on the extended infrared single-photon response of niobium nitride superconducting nanowires deposited by atomic layer deposition. The nanowire detectors are based 4.65 nm thick NbN, patterned into 100 meanders, and characterized at 2.5 K. verify sensitivity from 1310 to 2006 with saturated shorter wavelengths.
The Far-Infrared Fourier transform spectrometer instrument SAFARI-SPICA which will operate with cooled optics in a low-background space environment requires ultra-sensitive detector arrays high optical coupling efficiencies over extremely wide bandwidths. In earlier papers we described the design, fabrication and performance of ultra-low-noise Transition Edge Sensors (TESs) operated close to 100mk having dark Noise Equivalent Powers (<i>NEPs</i>) order 4 × 10<sup>−19</sup>W/√Hz phonon...
We describe optical characterisation of a Strained Silicon Cold Electron Bolometer (CEB), operating on $350~\mathrm{mK}$ stage, designed for absorption millimetre-wave radiation. The silicon utilises Schottky contacts between superconductor and an n++ doped island to detect changes in the temperature charge carriers silicon, due variations absorbed By using strained as absorber, we decrease electron-phonon coupling device increase responsivity incoming power. absorber is coupled planar...
Detector timing jitter is a key parameter in advanced photon counting applications. Superconducting nanowire single-photon detectors offer the fastest visible to telecom wavelength range and have demonstrated sensitivity mid-infrared spectral region. Here, we report on NbTiN device from 1.56 3.5 μm wavelength, achieving FWHM 13.2 30.3 ps. This study has implications for emerging time-correlated applications
We describe the optimization of transition edge superconducting (TES) detectors for use in a far-infrared (FIR) Fourier transform spectrometer (FTS) mounted on cryogenically cooled space-borne telescope (e.g. SPICA). The required noise equivalent power (NEP) is approximately 10<sup>-19</sup>W/√Hz order to be lower than photon from astrophysical sources octave wide bands FIR. detector time constants must less 10 ms allow fast scanning FTS mechanism. consist thermometers suspended thin...
We fabricated and characterized low thermal conductance transition edge sensors (TES) for SAFARI instrument on SPICA. The device is based a superconducting Ti/Au bilayer deposited suspended SiN membrane. critical temperature of the 113 mK. realized by using long narrow supporting legs. All measurements were performed having in light‐tight box, which to great extent eliminates loading background radiation. measured current‐voltage (IV) characteristics different bath temperatures determine (G)...
We have measured the energy relaxation times from electron bath to phonon in strongly disordered TiN films grown by atomic layer deposition. The values of <inline-formula xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink"> <tex-math notation="TeX">$\tau_{\rm eph}$</tex-math></inline-formula> vary 12 91 ns. Over a temperature range 3.4 1.7 K, they follow notation="TeX">$T^{-3}$</tex-math></inline-formula> dependence, which are consistent with reported...
We present results from the development of a background limited transition edge sensor (TES) bolometer for wavelength band 30 -60 /im.The consists Ti/Au superconducting thermometer and Ta radiation absorber deposited on 200/im x300/im membrane SixNy suspended long, narrow legs.This device is voltage biased current through measured by SQUID amplifier.The has temperature Tc = 108 mK operated 70 base plate.FIR coupled into multimode horn with entrance aperture 450 /im, length 4.5 mm exit 45...
SPICA is an infra-red (IR) telescope with a cryogenically cooled mirror (~5K) three instruments on board, one of which SAFARI that imaging Fourier Transform Spectrometer (FTS) bands covering the wavelength 34-210 μm. We develop transition edge sensors (TES) array for short band (34-60 μm) SAFARI. These are based superconducting Ti/Au bilayer as TES bolometers T<sub><i>c</i></sub> about 105 mK and thin Ta film IR absorbers suspended silicon nitride (SiN) membranes. membranes supported by long...
Results of study optical performance single pixel transition edge sensor (TES) bolometer presented at wavelength band 30-60 μm are presented. FIR radiation is coupled into a multimode horn with entrance aperture 450 μm, length 4.5 mm and exit 45 , which feeds metal integrating cavity containing the detector. The defined by pair lowpass highpass mesh filters in front horn. Here we present measurements noise equivalent power (NEP), efficiency, dynamic range time constant. results show that...
We describe the geometry, architecture, dark- and optical performance of ultra-low-noise transition edge sensors as THz detectors for SAFARI instrument. The TESs are fabricated from superconducting Mo/Au bilayers coupled to impedance-matched β-phase Ta thin-film absorbers. have phonon-limited dark noise equivalent powers order 0.5 - 1.0 aW/ √ Hz saturation 20 40 fW. low temperature test configuration incorporating micro-machined backshorts is also described, construction typical...
We report on the investigation of titanium nitride (TiN) thin films deposited via atomic layer deposition (ALD) for microwave kinetic inductance detectors (MKID). Using our in-house ALD process, we have grown a sequence TiN (thickness 15, 30, 60 nm). The been characterised in terms superconducting transition temperature Tc , sheet resistance Rs and microstructure. fabricated test resonator structures them at 300 mK. At 350 GHz, an optical noise equivalent power NEPopt≈2.3×10-15W/Hz which is...
The next generation of space missions targeting far-infrared wavelengths will require large-format arrays extremely sensitive detectors. development Transition Edge Sensor (TES) array technology is being developed for future Far-Infrared (FIR) applications such as the SAFARI instrument SPICA where low-noise and high sensitivity required to achieve ambitious science goals. In this paper we describe a modal analysis multi-moded horn antennas feeding integrating cavities housing TES detectors...
We have measured the optical response of detectors designed for SAFARI, far-infrared imaging spectrometer SPICA satellite. To take advantage SPICA's cooled optics, SAFARI's three bolometer arrays are populated with extremely sensitive (NEP~2×10<sup>-19</sup> W/√Hz) transition edge sensors a temperature close to 100 mK. The extreme sensitivity and low saturation power (~4 fW) present challenges characterizing them. therefore built up an ultra-low background test facility cryogen-free...