A5062463697- Photonic and Optical Devices
- Optical Network Technologies
- Advanced Fiber Laser Technologies
- Semiconductor Lasers and Optical Devices
- Advanced Fiber Optic Sensors
- Photonic Crystal and Fiber Optics
- Advanced Photonic Communication Systems
- Photonic Crystals and Applications
- Silicon Nanostructures and Photoluminescence
- Thin-Film Transistor Technologies
- Photorefractive and Nonlinear Optics
- Plasmonic and Surface Plasmon Research
- Nonlinear Photonic Systems
- Laser Material Processing Techniques
- Optical Coatings and Gratings
- Neural Networks and Reservoir Computing
- Semiconductor Quantum Structures and Devices
- Laser-Matter Interactions and Applications
- Gold and Silver Nanoparticles Synthesis and Applications
- Mechanical and Optical Resonators
- Spectroscopy Techniques in Biomedical and Chemical Research
- Nonlinear Waves and Solitons
- Nonlinear Optical Materials Studies
- Phase-change materials and chalcogenides
- Advanced Surface Polishing Techniques
University of Southampton
2016-2025
Institute of Electrical and Electronics Engineers
2018-2021
Canadian Standards Association
2016-2020
Clemson University
2018
Norwegian University of Science and Technology
2018
KTH Royal Institute of Technology
2018
Human Resources Research Organization
2018
Pennsylvania State University
2013
University of Nottingham
2008
University of Auckland
2000-2005
A broad class of exact self-similar solutions to the nonlinear Schrödinger equation (NLSE) with distributed dispersion, nonlinearity, and gain or loss has been found. Appropriate solitary wave applying propagation in optical fibers fiber amplifiers these parameters have also studied. These exist for physically realistic dispersion nonlinearity profiles a anomalous group velocity dispersion. They correspond either compressing spreading pulses which maintain linear chirp chirped oscillatory...
Abstract The ability to process optical signals without passing into the electrical domain has always attracted attention of research community. Processing photons by unfolds new scenarios, in principle allowing for unseen signal processing and computing capabilities. Optical computation can be seen as a large scientific field which researchers operate, trying find solutions their specific needs different approaches; although challenges substantially different, they are typically addressed...
Pulse propagation in high-gain optical fiber amplifiers with normal group-velocity dispersion has been studied by self-similarity analysis of the nonlinear Schrödinger equation gain. For an amplifier a constant distributed gain, exact asymptotic solution found that corresponds to linearly chirped parabolic pulse propagates self-similarly amplifier, subject simple scaling rules. The evolution arbitrary input is associated development low-amplitude wings on whose functional form also means...
Self-similarity techniques are used to study pulse propagation in a normal-dispersion optical fiber amplifier with an arbitrary longitudinal gain profile. Analysis of the nonlinear Schrödinger equation that describes such leads exact solution high-power limit corresponds linearly chirped parabolic pulse. The self-similar scaling propagating is found be determined by functional form profile, and confirmed numerical simulations. implications for achieving chirp-free pulses after compression...
A broad class of exact self-similar solutions to the nonlinear Schrödinger equation (NLSE) with distributed dispersion, nonlinearity, and gain or loss has been found describing both periodic solitary waves. Appropriate wave applying propagation in optical fibers fiber amplifiers these parameters have also studied detail. These exist for physically realistic dispersion nonlinearity profiles. They correspond either compressing spreading pulses which maintain a linear chirp chirped oscillatory...
In this paper we discuss silicon-based photonic integrated circuit technology for applications beyond the telecommunication wavelength range. Silicon-on-insulator and germanium-on-silicon passive waveguide circuits are described, as well integration of III-V semiconductors, IV-VI colloidal nanoparticles GeSn alloys on these increasing functionality. The strong nonlinearity silicon combined with low nonlinear absorption in mid-infrared is exploited to generate picosecond pulse based...
High purity crystalline ZnSe compound semiconductor waveguides are fabricated inside optical fibers via high-pressure chemical vapor deposition. These fiber exhibit very low loss (e.g., <1 dB cm−1 at 1550 nm wavelength). The superior and electronic properties of semiconductors can now be exploited in a geometry. Detailed facts importance to specialist readers published as "Supporting Information". Such documents peer-reviewed, but not copy-edited or typeset. They made available submitted by...
Abstract Glass fibres with silicon cores have emerged as a versatile platform for all-optical processing, sensing and microscale optoelectronic devices. Using SiGe in the core extends accessible wavelength range potential optical functionality because bandgap properties can be tuned by changing composition. However, germanium segregate unevenly during non-equilibrium solidification, presenting new fabrication challenges, requiring detailed studies of alloy crystallization dynamics fibre...
Reduced losses in silicon-core fibers are obtained using CO2 laser directional recrystallization of the core. Single crystals with aspect ratios up to 1500:1 reported, limited by scan range equipment. This processing technique holds promise for bringing crystalline a central role nonlinear optics and signal applications. The production silicon waveguides fiber form is rapidly expanding area research. These fibers, which comprise core glass cladding, offer exceptional optical1 optoelectronic...
Germanium based photonic devices can play a significant role in several applications, particularly the so-called fingerprint wavelength region. Here, we review our recent results on mid-infrared germanium that show promising performance 2-7.5 μm range.
The physics and applications of fiber-based supercontinuum (SC) sources have been a subject intense interest over the last decade, with significant impact on both basic science industry. New uses for SC are also constantly emerging due to their unique properties that combine high brightness, multi-octave frequency bandwidth, fiber delivery, single-mode output. few years seen research efforts focused extending wavelength coverage towards 2 20 $\mu$m molecular fingerprint mid-infrared (MIR)...
Abstract Microstructured optical fibers (MOFs) represent a promising platform technology for fully integrated next generation surface enhanced Raman scattering (SERS) sensors and plasmonic devices. In this paper we demonstrate silver nanoparticle substrates SERS detection within MOF templates with exceptional temporal mechanical stability, using organometallic precursors high‐pressure chemical deposition technique. These 3D offer significant benefits over conventional planar geometries, the...
All-optical modulation has been demonstrated in a germanium-on-silicon rib waveguide over the mid-infrared wavelength range of 2–3 μm using free-carrier absorption scheme. Transmission measurements have shown waveguides to low propagation losses that are relatively independent out 3.8 μm, indicating could be extended further into region for applications sensing and spectroscopy. By monitoring material recovery, lifetime micron-sized estimated ∼18 ns, allowing speeds within megahertz regime.
This paper reviews recent progress in the nascent field of semiconductor optical fibres, from fundamentals through to device demonstration. The incorporation materials into both step-index and microstructured fibre geometries provides a route introducing new optoelectronic functionality existing glass technologies. Herein, various fabrication methods that have been developed as date are described, their compatibility with different designs discussed. Results will be presented on transmission...
In this paper we present our recent work on mid-infrared photonic integrated circuits for spectroscopic sensing applications.We discuss the use of silicon-based purpose and detail how a variety optical functions in besides passive waveguiding filtering can be realized, either relying nonlinear optics or integration other materials such as GaSb-based compound semiconductors, GeSn epitaxy PbS colloidal nanoparticles.©2013 Optical Society America
In recent years, we have presented results on the development of erasable gratings in silicon to facilitate wafer scale testing photonics circuits via ion implantation germanium.Similar technology can be employed control operating wavelength ring resonators, which is very sensitive fabrication imperfections.Ion into causes radiation damage resulting a refractive index increase, and therefore, form basis multiple optical devices.In this paper, discuss design, modeling, resonators their...
Originally developed for metrology, optical frequency combs are becoming increasingly pervasive in a wider range of research topics including communications, spectroscopy, and radio or microwave signal processing. However, application demands these fields can be more challenging as they require compact sources with high tolerance to temperature variations that capable delivering flat comb spectra, power per tone, narrow linewidth signal-to-noise ratio. This work reports the generation flat,...
Abstract The embedding of nanoscopic metal structures into polymeric matrices represents a convenient way to stabilise controlled dispersion protected nanoparticles whilst taking advantage their physical characteristics. Supercritical carbon dioxide (scCO 2 ) has been used produce silver in optically transparent polycarbonate (PC) allowing fine scale dispersions particles be produced within prefabricated polymer component. Characterization these nanocomposites performed using transmission...
Silicon fibers are fabricated using a high pressure chemical deposition technique to deposit the semiconductor material inside silica capillary. The silicon is deposited in an amorphous state into pure capillaries and can be crystallized polysilicon after via temperature anneal. Optical transmission measurements of various polycrystalline core materials were performed order determine their linear losses. Incorporating functionality fiber geometry opens up new possibilities for next...
The nonlinear properties of a low loss hydrogenated amorphous silicon core fiber have been characterized for transmission high power pulses at 1540 nm.Numerical modelling the pulse propagation in material was used to establish two-photon absorption, free-carrier absorption and refractive index, which were found be larger than values typical crystalline silicon.Calculation figure merit demonstrates potential these fibers photonics applications.
Abstract Microresonators are ideal systems for probing nonlinear phenomena at low thresholds due to their small mode volumes and high quality ( Q ) factors. As such, they have found use both fundamental studies of light-matter interactions as well applications in areas ranging from telecommunications medicine. In particular, semiconductor-based resonators with large Kerr nonlinearities great potential speed, power all-optical processing. Here we present experiments characterize the size...