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Article
Surface Plasmon Polaritons in a Class of Quasiperiodic Nanoparticle Gauss Chains
We theoretically consider surface-plasmon (SP) polaritons (SPP) on chains of noncontacting metal nanoparticles (NP) along the z-axis at \(z=md\) ...
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Article
Terahertz Characterization of Glass-Based Materials and Stackups for 6 G Microelectronics Packaging
Glass-based materials, including polymer/glass stack ups, are attractive structural blocks for packaging substrates supporting 5 G and 6 G microelectronic modules and components. We present the first broadband...
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Article
Terahertz Dielectric Characterization of Low-Loss Thermoplastics for 6G Applications
Common thermoplastics, namely, polycarbonate (PC), poly (methyl methacrylate) (PMMA), and acrylonitrile butadiene styrene (ABS) are low-cost materials with potential applications in emerging 6G communications sys...
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Article
Open AccessRevealing inscriptions obscured by time on an early-modern lead funerary cross using terahertz multispectral imaging
The presence of a corrosion layer on lead art and archæological objects can severely impede the interpretation of inscriptions, thus hampering our overall understanding of the object and its context. While the...
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Article
Terahertz Nondestructive Stratigraphic Analysis of Complex Layered Structures: Reconstruction Techniques
Terahertz (THz) time-of-flight tomography (TOFT), a nondestructive-evaluation technique for the stratigraphic characterization of structures with layers on the micron-to-millimeter scales, has proven to be cha...
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Article
Terahertz Time-of-Flight Tomography Beyond the Axial Resolution Limit: Autoregressive Spectral Estimation Based on the Modified Covariance Method
We present a time-of-flight tomography method for exceeding the naïve axial (i.e., depth) resolution limit of terahertz (THz) deconvolution by autoregressive spectral extrapolation (AR) based on the modified c...
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Article
Application of Ultrasonic Coda Wave Interferometry for Micro-cracks Monitoring in Woven Fabric Composites
The consequences of a four-point bending test, up to 12 mm, are examined by emitting 1 MHz ultrasonic guided waves in woven carbon fiber reinforced polymer specimens, using coda wave interferometry (CWI), reve...
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Article
Enhancing optical-feedback-induced chaotic dynamics in semiconductor ring lasers via optical injection
In this paper, we investigate the possibility of using optical injection to efficiently suppress the time-delay (TD) signatures of chaotic signals in a large experimentally accessible parameter range of semico...
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Article
Open AccessGlobal map** of stratigraphy of an old-master painting using sparsity-based terahertz reflectometry
The process by which art paintings are produced typically involves the successive applications of preparatory and paint layers to a canvas or other support; however, there is an absence of nondestructive modal...
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Article
Open AccessCompressive Sensing with Optical Chaos
Compressive sensing (CS) is a technique to sample a sparse signal below the Nyquist-Shannon limit, yet still enabling its reconstruction. As such, CS permits an extremely parsimonious way to store and transmit...
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Article
Enhanced Terahertz Imaging of Small Forced Delamination in Woven Glass Fibre-reinforced Composites with Wavelet De-noising
Terahertz (THz) reflection imaging is applied to characterize a woven glass fibre-reinforced composite laminate with a small region of forced delamination. The forced delamination is created by inserting a dis...
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Article
Design of nonlinearity-enhanced quantum-cascade lasers
We present simulations of mid-infrared quantum-cascade lasers (QCL) with optimized second-harmonic generation (SHG). The optimized design was obtained utilizing techniques from supersymmetric quantum mechanics...
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Article
Electrodynamical treatment of the electron-hole long-range exchange interaction in semiconductor nanocrystals
We show that the contribution to the fine structure of the ground exciton level in a semiconductor nanocrystal due to the long-range part of the electron-hole exchange interaction can be equivalently described...
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Chapter and Conference Paper
Coherent Control and Nonlinear Interactions of Semiconductor Cavity Polaritons
We demonstrate coherent control of the cavity-polaritons of a quantum-well semiconductor microcavity in a two-color scheme. Evidence for a coherent two-photon biexciton transition and excitation induced dephas...
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Chapter
Terahertz-Control of Charge-Carrier Wavepackets in Semiconductor Quantum Wells
With the advancement of free-electron lasers [FEL’s] as well as THz solid-state emitters [1], THz physics and related technology is currently coming out of its infancy. Two-color techniques (optical and THz) a...
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Chapter
Optical Cross-Talk between Quantum Wells
In recent years, the dynamics of excitons in quantum wells (QWs) has attracted much attention especially under resonant excitation. Many time-resolved photolumines-cence experiments have been performed to stud...
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Chapter and Conference Paper
Coherence Transfer in Exciton-Exciton Scattering in a Semiconductor Microcavity
We describe recent evidence which indicates how scattering of weakly localized exciton-polaritons gives rise to normally-directed coherent emission from an obliquely excited planar microcavity.
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Article
Coherent exciton-photon dynamics in single, double, and quintuple quantum wells
We have studied experimentally the coherent exciton-photon dynamics in a single, a double, and a quintuple quantum well structure under resonant excitation. In pump and probe experiments we observe an initial ...
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Article
Coherent and incoherent dynamics of excitons in semiconductor microcavities
We have investigated the dynamics of impulsively excited planar microcavities in the strongly couple regime. With resonant, coherent excitation, the emitted light shows vacuum-Rabi oscillations and a lifetime ...
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Chapter
Excitonic Radiative Dynamics in Semiconductor Quantum Wells
The fabrication of quantum-well (QW) structures has allowed unprecidented flexibility to engineer the electronic and optical properties of materials. These technologies are widely exploited in devices. The per...
