A. G. Davies
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View article: Electrically driven heterostructured far-infrared wire lasers with integrated graphene plasmons
Electrically driven heterostructured far-infrared wire lasers with integrated graphene plasmons Open
View article: Cavity modification of magnetoplasmon mode through coupling with intersubband polaritons
Cavity modification of magnetoplasmon mode through coupling with intersubband polaritons Open
We investigate the coupling of a multi-mode metal-insulator-metal cavity to a two-dimensional electron gas (2DEG) in a quantum well in the presence of a strong magnetic field. The TM cavity mode is strongly hybridized with an intersubband …
View article: Experimental analysis of the thermal management and internal quantum efficiency of terahertz quantum cascade laser harmonic frequency combs
Experimental analysis of the thermal management and internal quantum efficiency of terahertz quantum cascade laser harmonic frequency combs Open
Quantum cascade laser (QCL) harmonic state frequency combs (HFCs) have recently attracted considerable interest for applications ranging from the generation of tones of high spectral purity, high data rate wireless communication networks, …
View article: Extended spectral response of cavity-based terahertz photoconductive antennas and coherent detection of quantum cascade lasers
Extended spectral response of cavity-based terahertz photoconductive antennas and coherent detection of quantum cascade lasers Open
Coherent ultrafast detection has become an important method to study the temporal response of terahertz (THz) quantum cascade lasers (QCLs), bringing insights into the dynamics of modelocking and frequency comb operation in these complex s…
View article: Discovery of orally bioavailable Zika and West Nile Virus antiviral compounds targeting the NS2B-NS3 protease
Discovery of orally bioavailable Zika and West Nile Virus antiviral compounds targeting the NS2B-NS3 protease Open
Flaviviruses are a class of pathogenic viruses with pandemic potential which are typically transmitted via infected arthropods. In particular, Zika virus is sexually transmissible and causes congenital malformations if infection occurs dur…
View article: Free-space and polarization maintaining delivery of terahertz radiation from a quantum cascade laser in a dry dilution refrigerator
Free-space and polarization maintaining delivery of terahertz radiation from a quantum cascade laser in a dry dilution refrigerator Open
We demonstrate a free-space terahertz (THz) optical system inside a dry dilution refrigerator that allows us to direct polarized THz radiation from a quantum cascade laser (QCL) to a sample held at a base temperature of 28 mK. The sample t…
View article: Terahertz frequency electronics and photonics: materials and devices
Terahertz frequency electronics and photonics: materials and devices Open
The terahertz frequency region of the electromagnetic spectrum sits at the interface of electronics and optics, lying between the microwave and infrared (IR) spectral regions. Although there are significant challenges to access, understand…
View article: High Q-contrast terahertz quantum cascade laser via bandgap-confined bound state in the continuum
High Q-contrast terahertz quantum cascade laser via bandgap-confined bound state in the continuum Open
Photonic bound states in the continuum (BICs) are optical modes that remain highly localized despite co-existing with radiating waves in the continuum, attracting considerable attention for both fundamental studies and technological innova…
View article: Ultracompact multibound-state-assisted flat-band lasers
Ultracompact multibound-state-assisted flat-band lasers Open
View article: Subwavelength 3D terahertz imaging with a single-pixel laser transceiver
Subwavelength 3D terahertz imaging with a single-pixel laser transceiver Open
Terahertz imaging holds great potential for non-destructive material inspection, but practical implementation has been limited by resolution constraints. In this study, we present a single-pixel THz imaging system based on a confocal micro…
View article: Free-space Optical Communications at 4 Gbit/s Data Rate with a Terahertz Laser
Free-space Optical Communications at 4 Gbit/s Data Rate with a Terahertz Laser Open
Terahertz-frequency (THz) carrier waves in free-space optical (FSO) communications offer the potential for >1 Tbit/s data rates and stable latency. They offer wider bandwidths than available in the microwave region, together with reduced s…
View article: To conjugate or not to conjugate? evaluating the potential use of cell-penetrating peptides for conjugation or complexation with oligonucleotides by surface plasmon resonance
To conjugate or not to conjugate? evaluating the potential use of cell-penetrating peptides for conjugation or complexation with oligonucleotides by surface plasmon resonance Open
Oligonucleotides represent a class of molecules that exhibit remarkable therapeutic potential due to their unparalleled target specificity, yet they suffer from limited cellular uptake and lack of tissue selectivity. Extensive research is …
View article: Detectorless 3D terahertz imaging: achieving subwavelength resolution with reflectance confocal interferometric microscopy
Detectorless 3D terahertz imaging: achieving subwavelength resolution with reflectance confocal interferometric microscopy Open
Terahertz imaging holds great potential for non-destructive material inspection, but practical implementation has been limited by resolution constraints. In this study, we present a single-pixel THz imaging system based on a confocal micro…
View article: Ultrafast (≈10 GHz) mid-IR modulator based on ultrafast electrical switching of the light–matter coupling
Ultrafast (≈10 GHz) mid-IR modulator based on ultrafast electrical switching of the light–matter coupling Open
We demonstrate a free-space amplitude modulator for mid-infrared radiation (λ ≈ 9.6 μm) that operates at room temperature up to at least 20 GHz (above the −3 dB cutoff frequency measured at 8.2 GHz). The device relies on the ultrafast tran…
View article: Terahertz near-field microscopy of metallic circular split ring resonators with graphene in the gap
Terahertz near-field microscopy of metallic circular split ring resonators with graphene in the gap Open
Optical resonators are fundamental building blocks of photonic systems, enabling meta-surfaces, sensors, and transmission filters to be developed for a range of applications. Sub-wavelength size (< λ/10) resonators, including planar split-…
View article: Asynchronous optical sampling of on-chip terahertz devices for real-time sensing and imaging applications
Asynchronous optical sampling of on-chip terahertz devices for real-time sensing and imaging applications Open
We demonstrate that asynchronous optical sampling (ASOPS) can be used to measure the propagation of terahertz (THz) bandwidth pulses in a coplanar waveguide device with integrated photoconductive switches used for signal excitation and det…
View article: Ultrafast (10 GHz) mid-IR modulator based on ultra-fast electrical switching of the light-matter coupling
Ultrafast (10 GHz) mid-IR modulator based on ultra-fast electrical switching of the light-matter coupling Open
We demonstrate a free-space amplitude modulator for mid-infrared radiation (lambda=9.6 um) that operates at room temperature up to at least 20 GHz (above the -3dB cutoff frequency measured at 8.2 GHz). The device relies on the ultra-fast t…
View article: Detecting Genetic Variation in Plants by Mapping Cell Water Dynamics With Terahertz Laser Feedback Interferometry
Detecting Genetic Variation in Plants by Mapping Cell Water Dynamics With Terahertz Laser Feedback Interferometry Open
View article: 2D Time-Domain Spectroscopy for Determination of Energy and Momentum Relaxation Rates of Hydrogen-Like Donor States in Germanium
2D Time-Domain Spectroscopy for Determination of Energy and Momentum Relaxation Rates of Hydrogen-Like Donor States in Germanium Open
We present measurements of the coherence times of excited states of hydrogen-like arsenic impurities in germanium (Ge:As) using a table-top two-dimensional time-domain spectroscopy (2D-TDS) system. We show that this laboratory system is ca…
View article: Near-field detection of gate-tunable anisotropic plasmon polaritons in black phosphorus at terahertz frequencies
Near-field detection of gate-tunable anisotropic plasmon polaritons in black phosphorus at terahertz frequencies Open
View article: Compact terahertz harmonic generation in the Reststrahlenband using a graphene-embedded metallic split ring resonator array
Compact terahertz harmonic generation in the Reststrahlenband using a graphene-embedded metallic split ring resonator array Open
View article: Microscopy of terahertz spoof surface plasmons propagating on planar metamaterial waveguides
Microscopy of terahertz spoof surface plasmons propagating on planar metamaterial waveguides Open
Surface plasmon polaritons (SPPs) are electromagnetic waves that have attracted significant interest owing to their subwavelength confinement and the strong field enhancement that they provide. Yet in the terahertz (THz) frequency region o…
View article: Terahertz <i>in vivo</i> imaging of human skin: Toward detection of abnormal skin pathologies
Terahertz <i>in vivo</i> imaging of human skin: Toward detection of abnormal skin pathologies Open
Terahertz (THz) imaging has long held promise for skin cancer detection but has been hampered by the lack of practical technological implementation. In this article, we introduce a technique for discriminating several skin pathologies usin…
View article: Terahertz microscopy using laser feedback interferometry based on a generalised phase-stepping algorithm
Terahertz microscopy using laser feedback interferometry based on a generalised phase-stepping algorithm Open
View article: Optical conductivity of a Bi<sub>2</sub>Se<sub>3</sub> topological insulator with a THz transparent top gate
Optical conductivity of a Bi<sub>2</sub>Se<sub>3</sub> topological insulator with a THz transparent top gate Open
We have performed an investigation into the optical conductivity and magnetotransport properties of top-gated devices patterned on the topological insulator Bi 2 Se 3 in order to determine the relative effects of the different carrier spec…
View article: Sculpting harmonic comb states in terahertz quantum cascade lasers by controlled engineering
Sculpting harmonic comb states in terahertz quantum cascade lasers by controlled engineering Open
Optical frequency combs (OFCs), which establish a rigid phase-coherent link between the microwave and optical domains of the electromagnetic spectrum, are emerging as key high-precision tools for the development of quantum technology platf…
View article: Ultra-sensitive heterodyne detection at room temperature in the atmospheric windows
Ultra-sensitive heterodyne detection at room temperature in the atmospheric windows Open
We report room temperature heterodyne detection of a quantum cascade laser beaten with a local oscillator on a unipolar quantum photodetector in two different atmospheric windows, at 4.8 µm and 9 µm. A noise equivalent power of few pW is m…
View article: Featurizing Koopman Mode Decomposition For Robust Forecasting
Featurizing Koopman Mode Decomposition For Robust Forecasting Open
This article introduces an advanced Koopman mode decomposition (KMD) technique -- coined Featurized Koopman Mode Decomposition (FKMD) -- that uses delay embedding and a learned Mahalanobis distance to enhance analysis and prediction of hig…
View article: Efficient THz generation from low-temperature-grown GaAs photoconductive antennas driven by Yb-doped fiber amplifier at 200 kHz repetition rate
Efficient THz generation from low-temperature-grown GaAs photoconductive antennas driven by Yb-doped fiber amplifier at 200 kHz repetition rate Open
We demonstrate the generation of terahertz (THz) pulses with electric field strength reaching 34 kV/cm from low-temperature-grown GaAs (LT-GaAs) interdigitated photoconductive antennas driven by 1030 nm optical pulses delivered by a commer…
View article: Terahertz Plasmon Polaritons in Large Area Bi<sub>2</sub>Se<sub>3</sub> Topological Insulators
Terahertz Plasmon Polaritons in Large Area Bi<sub>2</sub>Se<sub>3</sub> Topological Insulators Open
Assessing the nature of topological quantum materials, and in particular probing the existence of topological surface states, is a very challenging task. Terahertz (THz) frequency scattering near‐field optical microscopy has emerged as an …