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We develop a scalable heterogeneous integration platform for quantum photonic circuits based on Si3N4 waveguides and on-chip, self-assembled InAs quantum dot-based single-photon sources. Hybrid waveguides, photonic crystals, and microring resonators are demonstrated.
A novel monoclinic magnesium tungstate crystal, Tm:MgWO4, was grown and characterized in terms of structure, spectroscopy and laser generation. The output power was 772 mW at 2017–2029 nm with a slope efficiency of 39%.
By using free-running femtosecond OPOs with a repetition-rate difference of ∼500 Hz we demonstrate methane absorption spectroscopy at a resolution < 0.08 cm−1, fully calibrated in the optical domain from repetition-rate and carrier-envelope-offset frequency measurements.
We explore the frequency dependence of piezoceramic disc transducers bonded to plates. For some transducer dimensions, the frequency response shows a sharp peak. This behavior is inconsistent with the use of short pulses or broadband chirps for flaw localization. We use finite element simulation to show that the highly resonant behavior is caused by a high-strain region immediately beneath the transducer...
In this work, an all-optical ultrasound imaging system that is capable of synthesising arbitrary source aperture geometries is presented. This capability is achieved by delivering focussed excitation light onto a spatially extended generating surface, where ultrasound is generated photoacoustically. Using a scanning mirror, the position of the resulting acoustical source was continuously varied to...
Structural and functional neuroimaging studies have indicated that the cortico-striato -thalamo-cortical (CSTC) circuit contributes to the pathophysiology of obsessive compulsive disorder (OCD). As an essential component of CSTC circuit, the dorsal anterior cingulate cortex (dACC) plays an important role for its advanced function in cognition and emotion control. A comprehensive understanding of the...
Recognition of human actions by using wearable sensors has become an important research field. Segmentation to sensor data is a vital issue in reconstructing and understanding human daily actions, and strongly affects the accuracy of human actions recognition. Traditional online segmentation approaches are mostly designed for one-dimensional sensor data, which greatly limits these approaches to multi-dimensional...
In this study, we proposed a method which could be used for mapping people's emotion state on the two-dimensional arousal-valence model of effect. The final target of our research is to apply this kind of emotional recognition system to robots or some assistant apparatus which service activities of daily living (ADL). Since in our previous studies, we have finished the work of recognizing people's...
Dual-comb spectroscopy (DCS) [1] uses asynchronous broadband coherent sources to achieve Fourier-transform-like spectroscopy but with no moving parts and near-kHz acquisition rates [2]. Here we demonstrate dual-comb mid-infrared spectroscopy of methane gas using two free-running optical parametric oscillators (OPOs) with a repetition-rate difference of 500 Hz and complete optical calibration from...
Photonic integration is as an enabling technology for photonic quantum science, providing great experimental scalability, stability, and functionality. Although the increasing complexity of quantum photonic circuits has allowed proof-of-principle demonstrations of quantum computation, simulation, and metrology[1], further development is severely limited by the on-chip photon flux that can be made...
Twenty four units of 48V DC LED luminary are retrofitted at a 120m2 energy harvesting laboratory located at level five, CleanTech One building for energy efficiency applied research. DC renewable is connected to the building DC grid to power 125 lumen per watt DC LED luminaries system with real time sub-meters' logging, and communicating via Power over Ethernet (PoE) based intelligent control technology...
As one emerging bionic technique, the swarm robotics is a coordination and control strategy of multiple-robot systems, where a number of relatively simple robots are effectively integrated to complete sophisticated tasks while possessing characteristics of high robustness, flexibility, and low cost.
Pt/Co/heavy metal (HM) tri-layered structures with interfacial perpendicular magnetic anisotropy (PMA) are currently under intensive research for several emerging spintronic effects, such as spin-orbit torque (SOT) [1, 2], domain wall motion [3, 4] and room temperature skyrmions [5, 6].
The hybrid structures of a strong spin-orbit coupling (SOC) metal such as Pt and a magnetic insulator such as yttrium iron garnet (YIG) exhibit a variety of interesting spin current related phenomenon such as spin pumping, spin Seebeck effect, and spin Hall magnetoresistance (SMR) [1–2].
Nanoscale resistance reset of the SiO2/M stack (where M=Cu, Ni, Ti, Al, p-type Si) was investigated via a conductive atomic force microscope (C-AFM). Visible-light illumination triggers a resistance reset for Ti, Al and p-type Si electrodes, however such a behavior is not always observed for the Cu and Ni electrodes. Conversely, electrical reset is possible for Cu and Ni, but not for the others. The...
A closed form solution is presented for the transient and steady-state response of surface permanent magnet synchronous machines to single FET short circuit failure in the drive. PWM techniques such as sine and discontinuous switching schemes are compared with respect to the motor performance under such fault condition. With the help of the analytic model the sensitivity of the key control parameters...
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