A5061264070- Photonic and Optical Devices
- Spectroscopy and Laser Applications
- Semiconductor Quantum Structures and Devices
- Terahertz technology and applications
- Semiconductor Lasers and Optical Devices
- Photonic Crystals and Applications
- Advanced Semiconductor Detectors and Materials
- Advanced Fiber Laser Technologies
- Plasmonic and Surface Plasmon Research
- Atmospheric Ozone and Climate
- Strong Light-Matter Interactions
- GaN-based semiconductor devices and materials
- Semiconductor materials and devices
- Quantum and electron transport phenomena
- Superconducting and THz Device Technology
- Quantum Dots Synthesis And Properties
- Gyrotron and Vacuum Electronics Research
- Laser Design and Applications
- Mechanical and Optical Resonators
- Nanowire Synthesis and Applications
- Thermal Radiation and Cooling Technologies
- Random lasers and scattering media
- Optical Coatings and Gratings
- Advanced Chemical Physics Studies
- Electronic and Structural Properties of Oxides
Hainan Normal University
2024-2025
University of Leeds
2016-2025
Beijing Chaoyang Emergency Medical Center
2025
Shanghai University of Medicine and Health Sciences
2025
Nanjing University of Science and Technology
2024
Chinese Academy of Sciences
1999-2024
Southwest Hospital
2024
Kunming University of Science and Technology
2024
Army Medical University
2024
Shandong University
2024
Terahertz (THz) frequency quantum cascade lasers emitting peak powers of >1 W from a single facet in the pulsed mode are demonstrated. The active region is based on bound‐to‐continuum transition with one‐well injector, and embedded into surface‐plasmon waveguide. emit at ∼3.4 THz have maximum operating temperature 123 K. measured emitted ∼1.01 10 K ∼420 mW 77 K, no correction made to allow for optical collection efficiency apparatus.
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTPolarized Laser Induced Holographic Surface Relief Gratings on Polymer FilmsD. Y. Kim, Lian Li, X. L. Jiang, V. Shivshankar, J. Kumar, and S. K. TripathyCite this: Macromolecules 1995, 28, 26, 8835–8839Publication Date (Print):December 1, 1995Publication History Published online1 May 2002Published inissue 1 December 1995https://pubs.acs.org/doi/10.1021/ma00130a017https://doi.org/10.1021/ma00130a017research-articleACS PublicationsRequest reuse...
The kinetic energy dependence of the collision-induced dissociation (CID) Fe+n (n=11–19) with Xe is studied by using a guided ion beam mass spectrometer. As previously reported for smaller iron cluster ions, these ions dissociate exclusively evaporation, sequential loss Fe atoms. Bond energies larger D0(Fe+n−1–Fe), n=11–19, as well updated values n=2–10, are reported. These derived after explicit consideration effect secondary collisions between and Xe, lifetimes energized ions. neutral...
We have optimized the molecular-beam epitaxy growth conditions of self-organized InAs∕GaAs quantum dots (QDs) to achieve a low density emitting at 1300 nm temperature. used an ultralow InAs rate, lower than 0.002ML∕s, reduce 2dots∕μm2 and InGaAs capping layer longer emission wavelength. Microphotoluminescence spectroscopy low-temperature reveals lines characteristic exciton-biexciton behavior. also study temperature dependence photoluminescence, showing clear single QD up 90 K. With these...
Terahertz (THz) frequency technology has many potential applications in nondestructive imaging, spectroscopic sensing, and high-bit-rate free-space communications, with an optical modulator being a key component. However, it proved challenging to achieve high-speed modulation high depth across broad bandwidth of THz frequencies. Here, we demonstrate that monolithically integrated graphene can efficiently modulate the light intensity radiation from quantum cascade laser 100% for certain...
The terahertz (THz) frequency quantum cascade laser (QCL) is a compact source of THz radiation offering high power, spectral purity and moderate tunability. As such, these sources are particularly suited to the application imaging across range disciplines, have motivated significant research interest in this area over past decade. In paper we review technological approaches QCL-based key advancements within field. We discuss detail number targeted areas including multiple-frequency...
Multi‐Watt high‐power terahertz (THz) frequency quantum cascade lasers are demonstrated, based on a single, epitaxially grown, 24‐μm‐thick active region embedded into surface‐plasmon waveguide. The devices emit in pulsed mode at of ∼4.4 THz and have maximum operating temperature 132 K. measurable emitted powers from single facet ∼2.4 W 10 K ∼1.8 77 K, with no correction being made for the optical collection efficiency apparatus, or absorption by cryostat polyethylene window.
Abstract Saturable absorbers (SA) operating at terahertz (THz) frequencies can open new frontiers in the development of passively mode-locked THz micro-sources. Here we report fabrication SAs by transfer coating and inkjet printing single few-layer graphene films prepared liquid phase exfoliation graphite. Open-aperture z -scan measurements with a 3.5 quantum cascade laser show transparency modulation ∼80%, almost one order magnitude larger than that reported to date frequencies....
One of the most exciting breakthroughs in physics is concept topology that was recently introduced to photonics, achieving robust functionalities, as manifested demonstrated topological lasers. However, so far almost all attention focused on lasing from edge states. Bulk bands reflect bulk-edge correspondence have been largely missed. Here, we demonstrate an electrically pumped bulk quantum cascade laser (QCL) operating terahertz (THz) frequency range. In addition band-inversion induced...
Topological cavities, whose modes are protected against perturbations, promising candidates for novel semiconductor laser devices. To date, there have been several demonstrations of topological lasers (TLs) exhibiting robust lasing modes. The possibility achieving nontrivial beam profiles in TLs has recently explored the form vortex wavefront emissions enabled by a structured optical pump or strong magnetic field, which inconvenient device applications. Electrically pumped TLs, contrast,...
Abstract Polaritons in two-dimensional layered crystals offer an effective solution to confine, enhance and manipulate terahertz (THz) frequency electromagnetic waves at the nanoscale. Recently, strong THz field confinement has been achieved a graphene-insulator-metal structure, exploiting plasmon polaritons (PPs) with strongly reduced wavelength ( λ p ≈ 0 /66) compared photon . However, graphene PPs propagate isotropically, complicating directional control of field, which, on contrary, can...
Harmonic generation is a result of strong non-linear interaction between light and matter. It key technology for optics, as it allows the conversion optical signals to higher frequencies. Owing its intrinsically large electrically tunable response, graphene has been used high harmonic but, until now, only at frequencies < 2 THz, with high-power ultrafast table-top lasers or accelerator-based structures. Here, we demonstrate third 9.63 THz by optically pumping single-layer graphene, coupled...
A series of novel second-order nonlinear optical (NLO) polymers have been developed based on a precursor polymer prepared from the diglycidyl ether Bisphenol and aniline. The was postfunctionalized by azo coupling reaction tricyanovinylation to form number NLO with different conjugation lengths electron acceptors. Post enabled introduction chromophores extension take place in single-step reaction. introduced system through covalent bonding not only define properties but also significantly...
We have studied the effect of rapid thermal annealing (RTA) on GaInNAs/GaAs quantum wells (QWs) grown by molecular-beam epitaxy using a dc plasma as N source. It was found that RTA at low temperature (LT, 650 °C) and high (HT, 900 could both improve QW quality significantly. To clarify mechanism improvement RTA, magnetic field perpendicular to path flux applied during growth GaInNAs layers for sake comparison. LT-RTA mainly removed dislocations interfaces related ion bombardment, whereas,...
The kinetic energy dependence of collision-induced dissociation (CID) Co+n (n=2–18) with xenon is studied by using a guided ion beam mass spectrometer. Examination the general behavior over broad collision range shows that cobalt cluster cations dissociate exclusively loss single atoms (cluster ‘‘evaporation’’), no evidence found for elimination molecular fragments. Bond energies cations, (n=2–18), are determined from measurements CID thresholds. neutral clusters, Con (n=4–18), derived...
We present time integrated and time-resolved photoluminescence (PL) measurements on a single InAs∕GaAs quantum dot (QD), embedded in planar microcavity, emitting the 1300nm telecom band. The results of both clearly identify exciton biexciton transitions from QD. By optimizing extraction efficiency QD PL into mode fibers carefully tuning two InGaAs avalanche photodiodes, we were able to measure second order correlation function with integration times comparable those made silicon based...