A5004456484- Semiconductor Lasers and Optical Devices
- Advanced Fiber Laser Technologies
- Spectroscopy and Laser Applications
- Photonic and Optical Devices
- Laser Design and Applications
- Nonlinear Dynamics and Pattern Formation
- Photonic Crystals and Applications
- Near-Field Optical Microscopy
- Neural Networks and Reservoir Computing
- Superconducting and THz Device Technology
- Gyrotron and Vacuum Electronics Research
- Italian Fascism and Post-war Society
- Italian Literature and Culture
- Gastric Cancer Management and Outcomes
- Lung Cancer Treatments and Mutations
- Educational and Social Studies
- Atmospheric Ozone and Climate
- Lung Cancer Research Studies
- Terahertz technology and applications
The University of Queensland
2022-2024
The University of Sydney
2024
Queensland University of Technology
2022-2023
Polytechnic University of Turin
2020-2022
University of Insubria
2021
Harvard University
2021
Istituto di Fotonica e Nanotecnologie
2021
Polytechnic University of Bari
2021
Center for Nano Science and Technology
2021
Italian Institute of Technology
2021
Over the past decade, demonstration of frequency combs has been reported in a wide range quantum cascade lasers. These have huge potential applications, including spectroscopy, sensing, imaging, and communication domains. In this perspective review, we explore modeling experimental state art on mid-infrared terahertz lasers, 10 years since first demonstrations that these devices can spontaneously generate combs.
Frequency combs have become a prominent research area in optics. Of particular interest as integrated comb technology are chip-scale sources, such semiconductor lasers and microresonators, which consist of resonators embedding nonlinear medium either with or without population inversion. Such active passive cavities were so far treated distinctly. Here we propose formal unification by introducing general equation that describes both types cavities. The also captures the physics hybrid...
We present a general theory of multicolor soliton microcombs. These frequency combs require engineered dispersion and have an optical spectrum consisting multiple spectral windows. Our is based on multiple-scale approach applied to the Lugiato–Lefever equation (LLE) provides framework investigate different pumping configurations. For multi-frequency pumping, we predict decreasing threshold as number windows increases due enhanced effective nonlinear parameter. However, comb formation does...
We cast a theoretical model based on effective semiconductor Maxwell-Bloch equations and study the dynamics of multi-mode mid-infrared quantum cascade laser in Fabry-Perot configuration with aim to investigate spontaneous generation optical frequency combs. This encompasses key features active medium, such as asymmetric, frequency-dependent gain refractive index well phase-amplitude coupling field provided by linewidth enhancement factor, some specific resonator features, spatial hole...
Near-field imaging techniques, at terahertz frequencies (1–10 THz), conventionally rely on bulky laser sources and detectors. Here, we employ a semiconductor heterostructure as THz source and, simultaneously, phase-sensitive detector, exploiting optical feedback interferometry combined with scattering near-field nanoscopy. We analyze the amplitude phase sensitivity of proposed technique function driving current attenuation, discussing operational conditions ideal to optimize nano-imaging...
Abstract Nonlinear interactions in many physical systems lead to symmetry breaking phenomena which an initial spatially homogeneous stationary solution becomes modulated. Modulation instabilities have been widely studied since the 1960s different branches of nonlinear physics. In optics, they may result formation optical solitons, localized structures that maintain their shape as propagate, investigated ranging from fibres passive microresonators. Recently, a generalized version...
We present an extended study concerning the dynamics of dense and harmonic coherent regimes in quantum cascade lasers (QCLs) a Fabry--Perot (FP) configuration emitting terahertz (THz) spectral region. Firstly, we device free running operation, reproducing main features self-generated optical frequency combs (OFCs) (HFCs) this range, commenting on points difference from mid-infrared region, finding excellent agreement with most recent experimental evidences. Then, analyze THz-QCL under...
We present a numerical and analytical study of the self-detection scattering type near field optical microscopy (SD s-SNOM), recently demonstrated technique based on combination self-mixing interferometry near-field microscopy. This scheme, which exploits terahertz (THz) quantum cascade laser as both source detector, allows to investigate properties resonant materials in THz range with resolution far beyond diffraction limit. Our study, developed by using modified version Lang-Kobayashi...
This study investigates the interaction between frequency combs and optical feedback effects in Quantum Cascade Lasers (QCLs). The theoretical analysis reveals new phenomena arising from interplay comb generation feedback. By considering bias current corresponding to free-running single mode emission, introduction of can trigger combs, including both fundamental harmonic combs. presents opportunities extend region generate with different orders through optimization external cavity...
We compare the spontaneous formation of Optical Frequency Combs (OFCs) in ring and Fabry-Perot (FP) Quantum Cascade Lasers (QCLs), adopting a reduced model derived from Effective Semiconductor MaxwellBloch Equations near threshold hypothesis fast medium polarization carriers. This consists single spatiotemporal equation for an order parameter represented by electric field. While configuration it reduces to complex Ginzburg-Landau (CGLE), agreement with recent studies, FP non local integral...
We present a numerical study of the active harmonic mode locking (HML) quantum cascade lasers (QCLs) in terahertz (THz) spectral range. This is recently experimentally demonstrated technique based on modulation bias current laser by radio-frequency (rf) injection, allowing for generation multiple short pulses per round-trip QCL cavity. first Fabry-P\'erot (FP) configuration, unraveling impact both intrinsic parameters and rf injection characteristics generated pulses. Our demonstrates that...
In this paper, we use a time-domain traveling-wave approach with coupled-mode theory to describe the dynamics of mid-Infrared (MIR) Quantum Cascade Laser (QCL) in Distributed-Feedback (DFB) configuration.We demonstrate that linewidth enhancement factor (LEF) and spatial hole burning (SHB) play crucial role influencing device's singlemode behavior.Neglecting them leads an overestimation interval pump currents granting single-mode emission inaccurate simulation QCLs' multimode dynamics.By...
In this manuscript, we employ a time-domain traveling-wave model with coupled-mode theory to characterize the dynamic behavior of mid-Infrared (MIR) Quantum Cascade Laser (QCL) in Distributed-Feedback (DFB) configuration. Our investigation underscores crucial influence linewidth enhancement factor (LEF) and spatial hole burning (SHB) on single-mode DFB QCLs. Disregarding these factors leads an overestimation range pump currents granting emission results inaccurate simulation multimodal...
We present a unified model to describe the dynamics of optical frequency combs (OFCs) in quantum cascade lasers (QCLs), incorporating both ring and Fabry-P\'erot (FP) cavity configurations. The derives modified complex Ginzburg-Landau equation (CGLE), leveraging an order parameter approach is capable capturing configurations, thus enabling comparative analysis. In CGLE, nonlinear integral term appears which associated with coupling between counterpropagating fields FP whose suppression...
We present a unified model to describe the dynamics of optical frequency combs in quantum cascade lasers (QCLs), incorporating both ring and Fabry–Pérot (FP) cavity configurations. The derives modified complex Ginzburg–Landau equation (CGLE), leveraging an order parameter approach, is capable capturing configurations, thus enabling comparative analysis. This result demonstrates that FP QCLs, addition belong same universality class physical systems described by CGLE, which includes, among...
<title>Abstract</title> Chaos characterized by its irregularity and high sensitivity to initial conditions finds various applications in secure optical communications, random number generations, light detection ranging systems, etc. Semiconductor lasers serve as ideal platforms for chaos generations owing the advantages on-chip integration complex nonlinear effects. In near-infrared wavelengths, semiconductor laser based chaotic sources have been extensively studied experimentally...