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beam epitaxy (MBE) growth on transport characteristics of terahertz-frequency quantum cascade lasers (THz QCLs). We analysed four exemplary structures: a bound-to-continuum design, hybrid design, LO ... as a beacon of fundamental calibration steps required for successful realisation of THz QCLs. - The terahertz-frequency quantum cascade lasers (THz QCLs)1,2 emit light in the traditionally hard-to
(CSRR) array, with a 3.21 THz frequency quantum cascade laser (QCL). Combined with the high graphene nonlinearity, the mode confinement provided by the optically-pumped CSRR enhances the pump power ... interactions across the physical6, chemical7 and biological8,9 sciences. The key disruptor has been the quantum cascade laser (QCL)10, which progressed from being a laboratory curiosity to become an essential
, alternative approaches utilizing ultrafast driving lasers have garnered great interest. In this work, we demonstrate two-photon Rabi oscillations in the excited states of argon operating at terahertz ... limitation, it is preferable to employ intense ultrafast lasers to drive Rabi oscillations on picosecond or even femtosecond timescales13, manipulating the population and phase of quantum states in rapidly
We present observations of parasitic frequency components in the emission spectrum of typical photomixer sources for continuous wave (CW) terahertz generation. Broadband tunable photomixer systems ... direct power detectors, e.g., for source and/or detector characterization. Here, spectral components besides the intended terahertz emission at the difference frequency of the two excitation lasers can
acquired by laser feedback interferometry (LFI). Our approach allows for significantly reduced optical sampling and acquisition times whilst also avoiding the need for fitting to complex models of lasers ... . M. & Shore , K. A. Dynamical Diversity : Optical Feedback Effects on Semiconductor Lasers (Wiley, 2005 ). 46. Kundu , I. et al. Frequency tunability and spectral control in terahertz quantum cascade
We report on significant enhancements to the integration of terahertz (THz) quantum cascade lasers (QCL) and THz detection with a two-dimensional electron gas (2DEG) within a dilution refrigerator ... lasers . Electron. Lett . 53 ( 12 ), 799 - 800 ( 2017 ). https://doi.org/10.1049/el. 2017 .0662 9. M. Vaughan et al., Directed delivery of terahertz frequency radiation from quantum cascade lasers within a
Recent renewed operating temperatures in terahertz quantum cascade lasers emphasize on narrowing the periodic length in a 2-well resonant-phonon design for a clean quantum level structure, in which ... [Invited] . Opt. Express 26 , 9417 ( 2018 ). 4. Williams , B. S. Terahertz quantum-cascade lasers . Nat. Photon . 1 , 517 ( 2007 ). 5. Köhler , R. et al. Terahertz semiconductor-heterostructure laser
High electro-optical conversion efficiency is one of the most distinctive features of semiconductor lasers as compared to other types of lasers. Its further increase remains a significant objective ... diode cascade InGaAsAlGaAs quantum well VCSEL. in 1999 IEEE LEOS Annual Meeting Conference Proceedings. LEOS'99. 12th Annual Meeting. IEEE Lasers and Electro-Optics Society 1999 Annual Meeting (Cat. No
Non-polar m-plane GaN terahertz quantum cascade laser (THz-QCL) structures have been studied. One is traditional three-well resonant-phonon (RP) design scheme. The other is two-well phonon scattering ... terahertz laser systems . Nat. Photon . 15 , 16 - 20 ( 2020 ). 6. Williams , B. S. Terahertz quantum-cascade lasers . Nat. Photon . 2 , 854 - 856 ( 2007 ). 7. Chan , C. , Hu , Q. & Reno , J. L. Ground state
crystal lattice, it gives rise to phonon-polaritons (PPs), which have been proven useful in the dynamical manipulation of quantum materials and the advancement of terahertz technologies. Yet, current ... measurement of PPs. We resonantly launch broadband PPs with intense terahertz fields and measure the time-of-flight of each spectral component with time-resolved second harmonic generation. The time-of-flight
An on-demand source of bright entangled photon pairs is desirable for quantum key distribution (QKD) and quantum repeaters. The leading candidate to generate such pairs is based on spontaneous ... splitting of the intermediate exciton states in the biexciton-exciton cascade. Developing a bright, deterministic source of entangled photon pairs for applications in photonic quantum information processing1
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 ... ), coupled to a set of monochromatic, single-plasmon waveguide THz quantum cascade lasers (QCLs), delivering 0.1–2 mW optical power at frequencies ω0 in the range 2.01–4.65 THz. While the atomic force
The design, fabrication, and validation of a thin-film lithium niobate on insulator (LNOI) electro-optic (EO) time-domain terahertz (THz) wave detector is reported. LNOI offers unprecedented ... . Laser Photon. Rev. 5 , 124 - 166 ( 2011 ). 5. Castro-Camus , E. , Koch , M. & Mittleman , D. M. Recent advances in terahertz imaging: 1999 to 2021 . Appl. Phys. B-Lasers O 128, 12 ( 2022 ). 6. Couture , N
The combination of mid-infrared and photoacoustic spectroscopy has shown promising developments as a substitute for invasive glucose detection technology. A dual single-wavelength quantum cascade ... absorbance spectroscopy. Quantum cascade lasers (QCLs) in the MIR region have the advantage of generating strong and stable PA signals. The acoustic signals generated by QCLs can reach the interstitial fluid
. Correlated terahertz acoustic and electromagnetic emission in dynamically screened InGaN/GaN quantum wells . Phys. Rev. B 84 , 085317 ( 2011 ). 2. Armstrong , M. R. et al. Observation of terahertz radiation ... , ultrashort sound wavelengths in the nanometer scale are attainable in the terahertz (THz) domain, the highest sound frequencies in solids. The control and generation of THz sound waves offers a route to
The recent designs of terahertz quantum cascade lasers usually employ the short periodic length and also the tall barriers for high-temperature operation. In this work, the effect of high-energy ... ( 2013 ). 6. Albo , A. & Hu , Q. Carrier leakage into the continuum in diagonal GaAs/Al0.15GaAs terahertz quantum cascade lasers . Appl. Phys. Lett . 106 , 241101 ( 2015 ). 7. Vitiello , M. S. , Scalari
source codes are available in GitHub: http:// github.com/Muhammad-Arif-NUST/DPI_CDF. Keywords: Druggable proteins, Bioinformatics, PSSM, Physicochemical features, Cascade deep forest Introduction The ... local and global intrinsic properties of protein sequence. (b) We proposed DPI_CDF, a novel model based on cascade deep forest (CDF) to predict druggable proteins with superior performance on existing
We propose and design a flat and tunable terahertz lens achieved through a two-dimensional photonic crystal composed of an array of rods made of a Dirac semimetal placed in air as the background ... , Terahertz Photonic crystals (PCs) are dielectric structures with refractive index periodicity along one, two, or three directions of s pace1–3. Wavelength scale of the periodicity leads to formation of
The integration between vertical-cavity surface-emitting lasers and metasurfaces has been demonstrated to enable on-chip high-angle illumination for total internal reflection and dark-field ... example of the necessity of the fundamental building blocks of optical systems: light sources (in particular, lasers) and beamshaping elements. Traditionally, lasers and beam-shaping elements are stand
advances that have been made in developing 1.3-μm Si-based quantum dot (QD) lasers, extending the wavelength window to the widely used 1.55-μm telecommunication region remains difficult. In this study, we ... declare no competing interests. 1. Chen , S. M. et al. Electrically pumped continuous-wave III-V quantum dot lasers on silicon . Nat. Photonics 10 , 307 - 311 ( 2016 ). 2. Han, Y . et al. Recent advances
