A5021055318- Metamaterials and Metasurfaces Applications
- Liquid Crystal Research Advancements
- Quantum and electron transport phenomena
- Phase-change materials and chalcogenides
- Plasmonic and Surface Plasmon Research
- Semiconductor Quantum Structures and Devices
- Advanced Memory and Neural Computing
- Photonic and Optical Devices
- Terahertz technology and applications
- Graphene research and applications
- Diamond and Carbon-based Materials Research
- Semiconductor materials and devices
- Advanced Antenna and Metasurface Technologies
- Strong Light-Matter Interactions
- Chalcogenide Semiconductor Thin Films
- Optical Wireless Communication Technologies
- Photonic Crystals and Applications
- Optical Polarization and Ellipsometry
- Ferroelectric and Negative Capacitance Devices
- Optical Network Technologies
- Nanowire Synthesis and Applications
- Advanced Fiber Laser Technologies
- Electronic and Structural Properties of Oxides
- Nonlinear Optical Materials Studies
- Nanopore and Nanochannel Transport Studies
Snap40 (United Kingdom)
2024
University of Exeter
2012-2020
Google (United States)
2018
Alexion Pharma (Switzerland)
2018
Abstract The development of flat, compact beam‐steering devices with no bulky moving parts is opening up a new route to variety exciting applications, such as LIDAR scanning systems for autonomous vehicles, robotics and sensing, free‐space, even surface wave optical signal coupling. In this paper, the design, fabrication characterization innovative, nonvolatile, reconfigurable metadevices enabled by combination metasurfaces chalcogenide phase‐change materials reported. reflect an incident...
All-dielectric metasurfaces comprising arrays of nanostructured high-refractive-index materials are re-imagining what is achievable in terms the manipulation light. However, functionality conventional dielectric-based fixed by design; thus, their optical response locked at fabrication stage. A far wider range applications could be addressed if dynamic and reconfigurable control were possible. We demonstrate this here via novel concept hybrid metasurfaces, which reconfigurability achieved...
Here we present a roadmap on Photonic metasurfaces. This document consists of number perspective articles different applications, challenge areas or technologies underlying photonic Each will introduce the topic, state art as well give an insight into future direction subfield.
Graphene oxide (GO) resistive memories offer the promise of low-cost environmentally sustainable fabrication, high mechanical flexibility and optical transparency, making them ideally suited to future flexible transparent electronics applications. However, dimensional temporal scalability GO memories, i.e., how small they can be made fast switched, is an area that has received scant attention. Moreover, a plethora switching characteristics mechanisms been reported in literature, sometimes...
Magneto-oscillations of the electric dipole moment are predicted and analyzed for a single-electron nanoscale ring pierced by magnetic flux (an Aharonov-Bohm ring) subjected to an field in ring's plane. These oscillations accompanied periodic changes selection rules interlevel optical transitions allowing control polarization properties associated terahertz radiation.
Perfect absorber type devices are well-suited to many applications, such as solar cells, spatial light modulators, bio-sensors, and highly-sensitive photo-detectors. In a method for the design fabrication of in simple efficient way, while at same time maintaining control over key performance characteristics resonant frequency, reflection coefficient resonance quality factor, would be particularly advantageous. this work we develop method, based on eigenmode analysis critical coupling theory,...
A single-mode microcavity with an embedded Aharonov-Bohm quantum ring, which is pierced by a magnetic flux and subjected to lateral electric field, studied theoretically. It shown that external fields provide additional means of control the emission spectrum system. In particular, when through ring equal half-integer number quantum, small change in field allows tuning energy levels into resonance mode providing efficient way ring-microcavity coupling strength. Emission spectra system are...
We report a novel approach for the fabrication of micro-and nano-scale graphene devices via in-situ plasma functionalization and lithographic patterning large-area directly on CVD catalytic metal (Cu) substrates.This enables us to create graphene-based in their entirety prior any transfer processes, simplifying very significantly device process potentially opening up route use wider range target substrates.We demonstrate capabilities our technique flexible, transparent, graphene/graphene...
Phase-change materials, such as the well-known ternary alloy Ge 2 Sb Te 5 , are essential to many types of photonic devices, from re-writeable optical disk memories more recent developments phase-change displays, reconfigurable metasurfaces, and integrated devices systems. The successful design development applications requires accurate knowledge complex refractive index material being used. To this end, it is common practice rely on published experimental data. However, values can vary...
Tetrahedral amorphous (ta-C) carbon-based memory devices have recently gained traction due to their good scalability and promising properties like nanosecond switching speeds. However, cycling endurance is still a key challenge. In this paper, we present model that takes local fluctuations in sp <inline-formula xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink"><tex-math notation="LaTeX">$^{2}$ </tex-math></inline-formula>...
Graphene-based materials are being widely explored for a range of biomedical applications, from targeted drug delivery to biosensing, bioimaging and use antibacterial treatments, name but few. In many such it is not graphene itself that used as the active agent, one its chemically functionalized forms. The type chemical species functionalization will play key role in determining utility any graphene-based device particular application, because this determines large part physical, chemical,...
Abstract Magneto‐oscillations of the electric dipole moment are predicted and analyzed for a single‐electron nanoscale ring pierced by magnetic flux (an Aharonov‐Bohm ring) subjected to an field in ring's plane. These oscillations accompanied periodic changes selection rules inter‐level optical transitions allowing control polarization properties associated terahertz radiation. (© 2012 WILEY‐VCH Verlag GmbH & Co. KGaA, Weinheim)
We present novel phase-change material based metasurfaces for dynamic, recnofigurable and efficient wavefront shaping in the infrared spectrum. Dynamic control reconfigurability was obtained by incorporating an ultra-thin layer of widely-used phase change Ge <sub xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">2</sub> Sb Te xmlns:xlink="http://www.w3.org/1999/xlink">5</sub> . Our approach exploits hybrid dielectic/plasmonic resonances to achieve...
Carbon-based nonvolatile resistive memories are an emerging technology. Switching endurance remains a challenge in carbon based on tetrahedral amorphous (ta-C). One way to counter this is by oxygenation increase the repeatability of reversible switching. Here, we overview current status memories. We then present comparative study oxygen-free and oxygenated carbon-based memory devices, combining experiments molecular dynamics (MD) simulations.
All-dielectric metasurfaces consisting of arrays nanostructured high-refractive-index materials, typically Si, are re-writing what is achievable in terms the manipulation light. Such devices support very strong magnetic, as well electric, resonances, and free ohmic losses that severely limit performance their plasmonic counterparts. However, functionality dielectric-based fixed-by-design, i.e. optical response fixed by size, arrangement index nanoresonators. A far wider range applications...
One of the most distinctive features graphene is its huge inter-Landau-level splitting in experimentally attainable magnetic fields which results room-temperature quantum Hall effect. In this paper we calculate longitudinal conductivity induced by two-phonon scattering a quantizing field at elevated temperatures. It concluded that purely phonon-induced scattering, negligible for conventional semiconductor heterostructures under conditions, becomes comparable to disorder-induced contribution...
One of the emerging candidates to bridge gap between fast but volatile DRAM and non-volatile slow storage devices is tetrahedral amorphous carbon (ta-C) based memory [1]-[3]. This offers a very good scalability, data retention sub-5ns switching [2], [3]. Amorphous can be electrically optically switched from high resistance state (HRS) low (LRS) [4]. The electrical conduction in LRS thought through sp <sup xmlns:mml="http://www.w3.org/1998/Math/MathML"...
The combination of chalcogenide phase-change materials with optical metamaterial arrays is exploited to create new forms dynamic, tuneable and reconfigurable photonic devices including perfect absorbers, modulators, beam steerers filters.
Abstract All-dielectric metasurfaces and nanoantennas offer unprecedented flexibility efficiency of manipulation light at the nanoscale. Still, functionality conventional dielectric-based devices is fixed-by-design, i.e. response locked-in fabrication stage. To address challenges offered by modern nanophotonics, active, dynamic reconfigurable control such structures required. Here, we demonstrate active all-dielectric enabled embedding subwavelength chalcogenide phase-change material...
An approach for chemical sensing based on an ultra-thin tunable metamaterial band-pass IR transmission filter is proposed. Simulations supporting the concept are presented, with high field- enhancement and coinciding analyte’s absorption peak.