A5054884335- Photonic and Optical Devices
- Semiconductor Lasers and Optical Devices
- Neurobiology and Insect Physiology Research
- Plant and animal studies
- Advanced Photonic Communication Systems
- Photonic Crystals and Applications
- Spectroscopy and Quantum Chemical Studies
- Optical Network Technologies
- Insect and Arachnid Ecology and Behavior
- Aquatic life and conservation
- Semiconductor Quantum Structures and Devices
- Marine and coastal plant biology
- Liquid Crystal Research Advancements
- Optical Coatings and Gratings
- Plasmonic and Surface Plasmon Research
- Gold and Silver Nanoparticles Synthesis and Applications
- Neural Networks and Reservoir Computing
- Fossil Insects in Amber
- Plant Diversity and Evolution
- Metamaterials and Metasurfaces Applications
- Advanced Antenna and Metasurface Technologies
Loughborough University
2023
University of Exeter
2015-2023
Google (United States)
2017
University of Surrey
2011
Qinetiq (United Kingdom)
2006-2008
We proposed and experimentally demonstrated wavelength division (de)multiplexers (WDMs) utilizing the dispersive nature of self-imaging multimode interferometers. Proof-of-principle devices fabricated on silicon-on-insulator platform operated as 4-channel WDMs with a free spectral range >90 nm, an averaging cross talk <−20 dB for 1 nm band, insertion loss <2.0 dB. The potential higher channel counts smaller spacing was also predicted. This type WDM is easy to design fabricate. underlying...
The evolution of structural colour mechanisms in biological systems has given rise to many interesting optical effects animals and plants. instance the scarab beetle Chrysina resplendens is particularly distinctive. Its exoskeleton a bright, golden appearance reflects both right-handed left-handed circularly polarized light concurrently. chiral nanostructure responsible for these properties helicoid, which birefringent dielectric planes are assembled with an incremental rotation. This study...
Helicoidal architectures comprising various polysaccharides, such as chitin and cellulose, have been reported in biological systems. In some cases, these exhibit stunning optical properties analogous to ordered cholesteric liquid crystal phases. this work, we characterize the circularly polarized reflectance scattering from cuticle of beetle Chalcothea smaragdina (Coleoptera: Scarabaeidae: Cetoniinae) using experiments, simulations structural analysis. The selective reflection left-handed...
Abstract Covert optical signatures are a vital element in anticounterfeiting technologies. Plasmonic surfaces offer means of manipulating the properties light including realization colored pixels and images. In this work, concealed images with accurate color reproduction using plasmonic pixel arrays demonstrated. The spectral spatial control polarization conversion is accomplished by tailoring interaction surface plasmons through design arrangement nanostructures. latent image revealed...
Enhanced backscattering of microwave radiation is demonstrated experimentally in a biomimetic radially anisotropic spherical metamaterial component. The core-shell device replicates the optical function nanospheres observed tapetum reflector compound eye shrimp Litopenaeus vannamei (Boone, 1931) and translates effect from domain to frequencies. Analytical Mie theory calculations numerical-method simulations are used describe origin scattering single dielectric sphere terms its multipolar...
Upon illumination by ultraviolet light, many animal species emit light through fluorescence processes arising from fluorophores embedded within their biological tissues. Fluorescence studies in living organisms are however relatively scarce and so far limited to the linear regime. Multiphoton excitation analyses as well non-linear optical techniques offer unique possibilities investigate effects of local environment on excited states fluorophores. Herein these applied for first time study...
Hollow optical waveguides have some unique properties compared with their solid core counterparts. These include very broad waveband, high power transmission characteristics in conjunction extremely low interfacing and propagation losses. Such provide considerable potential for novel electro-optic infrared devices systems. In discrete micro-optical components hollow been used to demonstrate integrated circuits which are the analogue of electronic PCB. The underlying physics technology will...
The spectral and angle-dependent optical properties of two scarab beetle species belonging to the genus Chrysina are presented. display broadband reflectivity selectively reflect left-circularly polarized light. We use electron microscopy detail left-handed, twisted lamellar structure present in these biological systems imaging scatterometry characterize their bidirectional reflectance distribution function. show that nature beetles' originates due range pitch dimensions found structure.
Experimental results are presented to demonstrate polarization conversion in passive deep-etched gallium arsenide waveguides. The effect due process-dependent features of waveguide cross-section geometry, particular the asymmetry resulting from nonvertical etching, is investigated. A qualitative agreement with vector finite element method (VFEM) simulations shown. coupled-mode formulation used describe behavior. compared an elliptical-polarization analysis, obtained measurements angles...
SOI based MMIs prove to be versatile photonic structures for optical power splitting/combining, directional coupling, wavelength multiplexing/demultiplexing, etc. Such a structure benefits from relative ease of fabrication, low sensitivity fabrication error and temperature dependence. Whilst the majority previous designs optimizations investigated single MMIs, there is significant potential combine within device realization improved performance. We have designed simulated filter consisting...
We designed and experimentally demonstrated two new types of self-imaging MMIs. One worked as a WDM device the other wavelength filter.
We experimentally demonstrated a novel SOI based 4-channel coarse wavelength demultiplexer with tilted in/output MMI structure. It has an FSR of ~100nm, cross talk <;-20dB and insertion loss only 1~3dB.