Weidong Chu
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View article: Light extraction improvement in GaAs light-emitting diodes for teraherz upconversion imaging
Light extraction improvement in GaAs light-emitting diodes for teraherz upconversion imaging Open
Thanks to the terminal optical readout mode rather than the electrical readout mode that relies on traditional readout circuits, upconversion pixelless imaging devices have great potential for photon-type imaging in the infrared/terahertz …
View article: Terahertz Multicolor Imaging of Opaque Objects Using Self-Mixing Interferometry with Quantum-Cascade Lasers
Terahertz Multicolor Imaging of Opaque Objects Using Self-Mixing Interferometry with Quantum-Cascade Lasers Open
Self-mixing interference in a terahertz quantum-cascade laser has been demonstrated to be suitable for the detection of weak signals scattered or reflected by the target. This technology has achieved the high-sensitivity detection of compl…
View article: 3d Printing Metamaterials with Ultra-Broadband Microwave Absorption
3d Printing Metamaterials with Ultra-Broadband Microwave Absorption Open
View article: Surface Microstructure Enhanced Cryogenic Infrared Light Emitting Diodes for Semiconductor Broadband Upconversion
Surface Microstructure Enhanced Cryogenic Infrared Light Emitting Diodes for Semiconductor Broadband Upconversion Open
Broadband upconversion has various applications in solar photovoltaic, infrared and terahertz detection imaging, and biomedicine. The low efficiency of the light-emitting diodes (LEDs) limits the broadband upconversion performance. In this…
View article: Pixelless upconversion imaging based on surface microsphere coupled light emitting diodes
Pixelless upconversion imaging based on surface microsphere coupled light emitting diodes Open
High performance infrared imaging devices have extensive applications in environmental monitoring, surveillance, and national defense. Pixelless upconversion imaging devices offer promising potential for large-format infrared imaging. In t…
View article: Metasurface Enhanced Upconversion Efficiency for High-Performance Pixel-Less Thermal Imaging
Metasurface Enhanced Upconversion Efficiency for High-Performance Pixel-Less Thermal Imaging Open
High-performance infrared thermal imaging devices are widely used in military, biomedical and other fields. Upconversion pixel-less imaging is promising for infrared imaging. In this paper, we propose a hybrid metasurface to achieve high u…
View article: Broadband and photovoltaic THz/IR response in the GaAs-based ratchet photodetector
Broadband and photovoltaic THz/IR response in the GaAs-based ratchet photodetector Open
High-performance broadband infrared (IR)/terahertz (THz) detection is crucial in many optoelectronic applications. However, the spectral response range of semiconductor-based photodetectors is limited by the bandgaps. This paper proposes a…
View article: Local large temperature difference and ultra-wideband photothermoelectric response of the silver nanostructure film/carbon nanotube film heterostructure
Local large temperature difference and ultra-wideband photothermoelectric response of the silver nanostructure film/carbon nanotube film heterostructure Open
View article: Ultra-broadband THz/IR upconversion and photovoltaic response in semiconductor ratchet-based upconverter
Ultra-broadband THz/IR upconversion and photovoltaic response in semiconductor ratchet-based upconverter Open
An ultra-broadband upconversion device is demonstrated by direct tandem integration of a p-type GaAs/AlxGa1-xAs ratchet photodetector (RP) with a GaAs double heterojunction light emitting diode (DH-LED) using the molecular beam epitaxy. An…
View article: Optical pump assisted broadband terahertz frequency comb
Optical pump assisted broadband terahertz frequency comb Open
A broadband terahertz (THz) frequency comb assisted by an optical pump in THz quantum cascade lasers (QCLs) is investigated theoretically and numerically through a Maxwell–Bloch model combined with the coupled wave theory. When an optical …
View article: Optimization of the Cryogenic Light-Emitting Diodes for High-Performance Broadband Terahertz Upconversion Imaging
Optimization of the Cryogenic Light-Emitting Diodes for High-Performance Broadband Terahertz Upconversion Imaging Open
High-performance terahertz (THz) imaging devices have drawn wide attention due to their significant application in a variety of application fields. Recently, the upconversion device based on the integrated homo-junction interfacial workfun…
View article: Self-Mixing Signal Characteristics of Complex-Coupled Distributed-Feedback Terahertz Quantum-Cascade Lasers
Self-Mixing Signal Characteristics of Complex-Coupled Distributed-Feedback Terahertz Quantum-Cascade Lasers Open
Self-mixing interference (SMI) in terahertz quantum cascade lasers (THz QCLs) is one of the significant approaches for coherent THz imaging and sensing techniques. Here, the output characteristics of SMI in distributed feedback (DFB) THz Q…
View article: Ultrabroadband THz/IR upconversion and photovoltaic response in semi-conductor ratchet based upconverter
Ultrabroadband THz/IR upconversion and photovoltaic response in semi-conductor ratchet based upconverter Open
An ultrabroadband upconversion device is demonstrated by direct tandem integration of a p-type GaAs/AlxGa1-xAs ratchet photodetector (RP) with a GaAs double heterojunction LED (DH-LED) using the molecular beam epitaxy (MBE). An ultrabroadb…
View article: Realization of ultrabroadband THz/IR photoresponse in a bias-tunable ratchet photodetector
Realization of ultrabroadband THz/IR photoresponse in a bias-tunable ratchet photodetector Open
High performance Terahertz (THz) photodetector has drawn wide attention and got great improvement due to its significant application in biomedical, astrophysics, nondestructive inspection, 6th generation communication system as well as nat…
View article: Ultra-wideband self-powered photodetector based on suspended reduced graphene oxide with asymmetric metal contacts
Ultra-wideband self-powered photodetector based on suspended reduced graphene oxide with asymmetric metal contacts Open
An ultra-wideband self-powered photodetector based on suspended reduced graphene oxide with asymmetric metal contacts is reported.
View article: Deep-learning potential method to simulate shear viscosity of liquid aluminum at high temperature and high pressure by molecular dynamics
Deep-learning potential method to simulate shear viscosity of liquid aluminum at high temperature and high pressure by molecular dynamics Open
The shear viscosity of matter and efficient simulating methods in a wide range of temperatures and densities are desirable. In this study, we present the deep-learning many-body potential (the deep potential) method to reduce the computati…
View article: Stability diagrams of two optically mutual-injected quantum cascade lasers
Stability diagrams of two optically mutual-injected quantum cascade lasers Open
The dynamic properties and stability of optically mutual-injected arrays composed of terahertz quantum cascade lasers (THz QCLs) were investigated and compared with those of diode laser (DL) arrays. The influences of the coupling strength …
View article: Strongly enhanced local electromagnetic field in mid-infrared and terahertz photodetectors employing a hybrid antenna
Strongly enhanced local electromagnetic field in mid-infrared and terahertz photodetectors employing a hybrid antenna Open
A hybrid antenna consisting of a patch cavity and a metal grating is designed in this work. This antenna can effectively localize and enhance the intensity of the electric field inside a quantum well photodetector (QWP). The optical proper…
View article: Optically mutual-injected terahertz quantum cascade lasers for self-mixing velocity measurements
Optically mutual-injected terahertz quantum cascade lasers for self-mixing velocity measurements Open
Self-mixing velocity sensor based on a mutual-injected two-element terahertz quantum cascade laser (THz QCL) array is studied theoretically. The working characteristics of mutual-injected THz QCL array with different frequency detunings an…
View article: Basic phase-locking, noise, and modulation properties of optically mutual-injected terahertz quantum cascade lasers
Basic phase-locking, noise, and modulation properties of optically mutual-injected terahertz quantum cascade lasers Open
The phase-locking, noise, and modulation properties of two face-to-face optically mutual-injected terahertz (THz) quantum cascade lasers (QCLs) are analyzed theoretically. In the phase-locking range, the two THz QCLs are in stationary stat…
View article: Power Amplification and Coherent Combination Techniques for Terahertz Quantum Cascade Lasers
Power Amplification and Coherent Combination Techniques for Terahertz Quantum Cascade Lasers Open
Power amplification and coherent combination are important ways to improve the output power and beam quality of single‐mode terahertz quantum cascade lasers (THz QCLs). Up to date, the tapered waveguide is the most convenient way to amplif…
View article: High-power terahertz quantum cascade lasers with ∼0.23 W in continuous wave mode
High-power terahertz quantum cascade lasers with ∼0.23 W in continuous wave mode Open
Terahertz quantum cascade lasers with a record output power up to ∼0.23 W in continuous wave mode were obtained. We show that the optimal 2.9-mm-long device operating at 3.11 THz has a low threshold current density of 270 A/cm2 at ∼15 K. T…
View article: Mid-infrared-pumped quantum cascade structure for high-sensitive terahertz detection
Mid-infrared-pumped quantum cascade structure for high-sensitive terahertz detection Open
Based on multiple quantum wells, we design a pumping-detection quantum cascade structure for the detection of terahertz (THz) radiation. In the structure, carriers are first pumped by a mid-infrared (MIR) laser to an excited state, to get …