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We demonstrate the first II–VI based short-wave (λ ≤ 4 µm) Quantum Cascade Detector. Peak responsivity and background limited detectivity of 0.1 mA/W and 2.5×1010 cm√Hz/W, respectively, were measured at 80 K.
We present a fully integrated mid-infrared sensor. The laser and detector are fabricated from a bi-functional quantum cascade structure, connected through a dielectric-loaded surface plasmon waveguide, which acts as interaction zone and provides high coupling.
We demonstrated antenna-assisted mid-infrared graphene detectors at room temperature with more than 200 times enhancement of responsivity (0.4 V/W at λ0=4.45 µm) compared to devices without antennas (<2 mV/W).
A novel ultra-broad bandwidth ultrasound detector is demonstrated using imprinted polymer microring, with flat frequency response up to ∼350 MHz at −3dB. A record high sub-3µm axial resolution in ultrasound/photoacoustic imaging applications is demonstrated.
Thin film Ge1−xSnx photodetectors fabricated on Si using a CMOS compatible process had responsivities at 1.55 µm of 6.59, 1.49, 2.63, and 0.84 mA/W for 0.9, 2.57, 3.2, and 7.0 % Sn. Spectral response for a Ge0.93Sn0.07 photodetector had extended infrared response out to 2.2 µm.
We report an interferometer consisting of two spatially separated balanced Mach-Zehnder interferometers sharing a polarization entangled source. Nonlocal correlation statistics enable entanglement detection, Bell state identification, and fidelity bounding.
A lidar system with high tolerance to background light is described. Velocity sensitivity measurements using two different signal processing methods are compared. Sensitivity of −90 dBm is realized for up to 6.9 km/s emulated speeds.
We developed a scalable method for integrating sub-70-ps-timing-jitter superconducting nanowire single-photon detectors with photonic integrated circuits. We assembled a photonic chip with four integrated detectors and performed the first on-chip g(2)(τ)-measurements of an entangled-photon source.
Todays terahertz instrumentation lacks cost-effective sources and detectors compatible with standard microelectronics to drive down the system cost. This paper presents recent developments based on silicon process technologies and discusses the challenges in implementing source and detectors. It presents a 530 GHz source array with up to 1 mW radiated power, a 1024-pixel CMOS camera, and a heterodyne...
We report a photon-counting depth imager with sub-centimeter resolution of low-signature targets at kilometer range. The system exploited a Peltier-cooled InGaAs/InP single-photon detector module and a 1550 nm wavelength pulsed laser with sub-milliwatt average powers.
We demonstrated up-conversion assisted detection of a 2.05-µm signal by using a bulk periodically poled Lithium niobate crystal. The 94% intrinsic up-conversion efficiency and 22.58% overall detection efficiency at pW level of 2.05-µm was achieved.
A three-layer delay line anode detector has been used in x-ray pump x-ray probe time-resolved measurement at LCLS. We used ∼10 fs long pulses to initiate and probe ultrafast dynamics in the dication of acetylene. The dynamics are discerned from the temporal evolution of multi-particle coincidences.
By employing low dark count up-conversion single photon detectors, we have experimentally demonstrated the passive decoy-state method over a 50-km-long optical fiber and have obtained a key rate of about 100 bit/s.
We show that the performance of continuous-variable measurement-device-independent quantum key distribution will decline dramatically when considering detector's imperfections. However, it can be improved by using phase sensitive optical amplifiers.
We introduced, characterized and modeled a simple nanodetector to investigate the efficiency and yield limitations of NbN superconducting single photon detectors. These crucial issues are related to the detectors strongly inhomogeneous nature at the nanoscale.
We measure a saturation of the internal quantum efficiency of superconducting nanowire single-photon detectors based on a Mo0.75Ge0.25 alloy with peak system detection efficiency of 30%.
We have developed a room temperature, broadband, and polarization-sensitive terahertz detector based on a p-n junction film of highly aligned and ultralong carbon nanotubes. Direct thermoelectric measurements demonstrate the photothermoelectirc nature of the detection mechanism
Interferometric gravitational wave detectors are poised to launch a new era of gravitational-wave astronomy. I will describe the basic principles behind gravitational wave detection and how we achieve sub-attometer displacement sensitivity in kilometer-scale laser interferometers using precision measurement techniques that include quantum optics and optomechanics.
A III-nitride-based Quantum Cascade detector grown by MOCVD is designed, fabricated and tested. Peak responsivity of 100 µA/W with detectivity of up to 108 Jones at ∼ 4 µm is measured.
We discuss the design and implementation of a receiver for the Lunar Laser Communication Demonstration based on a 12-pixel array of tungsten silicide superconducting nanowire single photon detectors. The receiver was used to close a software communication link from lunar orbit at 39 and 79 Mbps.
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