Now showing items 1-20 of 42

  • Active slow light in silicon photonic crystals : tunable delay and Raman gain 

    Rey, Isabella H. (University of St Andrews, 2012-11-30) - Thesis
    In the past decade, great research effort was inspired by the need to realise active optical functionalities in silicon, in order to develop the full potential of silicon as a photonic platform. In this thesis we explore ...
  • Cascaded modulator architecture for WDM applications 

    Debnath, Kapil; O'Faolain, Liam; Gardes, Frederic Y.; Steffan, Andreas G.; Reed, Graham T.; Krauss, Thomas F. (2012-12-03) - Journal article
    Integration density, channel scalability, low switching energy and low insertion loss are the major prerequisites for on-chip WDM systems. A number of device geometries have already been demonstrated that fulfill these ...
  • Dielectric waveguide vertically coupled to all-silicon photodiodes operating at telecommunication wavelengths 

    Debnath, Kapil; Gardes, Frederic Y.; Knights, Andrew P.; Reed, Graham T.; Krauss, Thomas F.; O'Faolain, Liam (2013-04) - Journal article
    We present a method for detecting light in the 1550 nm wavelength window based on a silicon nitride waveguide that is vertically coupled to a silicon photonic crystal cavity. The absorption in silicon arises from deep-levels ...
  • Dual gratings for enhanced light trapping in thin-film solar cells by a layer-transfer technique 

    Schuster, Christian S.; Kowalczewski, Piotr; Rezende Martins, Emiliano; Patrini, Maddalena; Scullion, Mark G.; Liscidini, Marco; Lewis, Liam; Reardon, Christopher; Andreani, Lucio C.; Krauss, Thomas F. (2013-05-06) - Journal article
    Thin film solar cells benefit significantly from the enhanced light trapping offered by photonic nanostructures. The thin film is typically patterned on one side only due to technological constraints. The ability to ...
  • Efficient colour routing with a dispersion-controlled waveguide array 

    Liu, Yi-Kun; Wang, Si-Cong; Li, Yong-Yao; Song, Li-Yan; Xie, Xiang-Sheng; Feng, Ming-Neng; Xiao, Zhi-Ming; Deng, Shao-Zhi; Zhou, Jian-Ying; Li, Jun-Tao; Wong, Kam Sing; Krauss, Thomas F. (2013-02) - Journal article
    Splitting white light into its constituent spectral components has been of interest ever since Newton first discovered the phenomenon of color separation. Many devices have since been conceived to achieve efficient wavelength ...
  • Electrically injected photonic-crystal nanocavities 

    Welna, Karl (University of St Andrews, 2011-11-30) - Thesis
    Nano-emitters are the new generation of laser devices. A photonic-crystal cavity, which highly confines light in small volumes, in combination with quantum-dots can enhance the efficiency and lower the threshold of this ...
  • The electrophotonic silicon biosensor 

    Juan-Colás, José; Parkin, Alison; Dunn, Katherine E.; Scullion, Mark G.; Krauss, Thomas F.; Johnson, Steven D. (2016-09-14) - Journal article
    The emergence of personalized and stratified medicine requires label-free, low-cost diagnostic technology capable of monitoring multiple disease biomarkers in parallel. Silicon photonic biosensors combine high-sensitivity ...
  • Evidence of guided resonances in photonic quasicrystal slabs 

    Ricciardi, Armando; Pisco, Marco; Cutolo, Antonello; Cusano, Andrea; O'Faolain, Liam; Krauss, Thomas F.; Castaldi, Giuseppe; Galdi, Vincenzo (2011-08-29) - Journal article
    We report on the experimental evidence of Fano-type guided resonances (GRs) in aperiodically-ordered photonic quasicrystal slabs. With specific reference to the Ammann-Beenker (8-fold symmetric, quasiperiodic) octagonal ...
  • Experimental evidence of guided-resonances in photonic crystals with aperiodically ordered supercells 

    Ricciardi, Armando; Pisco, Marco; Gallina, Ilaria; Campopiano, Stefania; Galdi, Vincenzo; O'Faolain, Liam; Krauss, Thomas F.; Cusano, Andrea (2010-12-01) - Journal article
    We report on the first experimental evidence of guided resonances (GRs) in photonic crystal slabs based on aperiodically ordered supercells. Using Ammann-Beenker (quasiperiodic, eightfold symmetric) tiling geometry, we ...
  • Fabrication of low loss dispersion engineered chalcogenide photonic crystals 

    Spurny, Marcel; O'Faolain, Liam; Bulla, Douglas A. P.; Luther-Davies, Barry; Krauss, Thomas F. (2011-01-31) - Journal article
    We demonstrate low loss photonic crystal waveguides in chalcogenide (Ge33As12Se55) glasses. The measured losses are as low as 21dB/cm. We experimentally determine the refractive index of the thin film chalcogenide glass ...
  • Flexible metamaterials at visible wavelengths 

    Di Falco, Andrea; Ploschner, Martin; Krauss, Thomas F. (2010-11-04) - Journal article
    We report on the fabrication and characterization of plasmonic structures on flexible substrates (Metaflex) and demonstrate the optical properties of a single layer of Metaflex. The layer exhibits a plasmonic resonance in ...
  • Four-wave mixing in slow light photonic crystal waveguides with very high group index 

    Li, Juntao; O'Faolain, Liam; Krauss, Thomas F. (2012-07-30) - Journal article
    We report efficient four-wave mixing in dispersion engineered slow light silicon photonic crystal waveguides with a flat band group index of n(g) = 60. Using only 15 mW continuous wave coupled input power, we observe a ...
  • Free space optical interconnects for speckled computing 

    Reardon, Christopher P. (University of St Andrews, 2009-06-26) - Thesis
    The aim of this project was to produce an integrate-able free space optical transceiver for Specks. Specks are tiny computing units that together can form a powerful network called a SpeckNet. The SpeckNet platform is ...
  • High speed e-beam writing for large area photonic nanostructures—a choice of parameters 

    Li, Kezheng; Li, Juntao; Reardon, Christopher; Schuster, Christian S.; Wang, Yue; Triggs, Graham J.; Damnik, Niklas; Muënchenberger, Jana; Wang, Xuehua; Martins, Emiliano R.; Krauss, Thomas F. (2016-09-16) - Journal article
    Photonic nanostructures are used for many optical systems and applications. However, some high-end applications require the use of electron-beam lithography (EBL) to generate such nanostructures. An important technological ...
  • Indirect transitions of a signal interacting with a moving refractive index front 

    Munoz, Michel Castellanos; Petrov, Alexander Yu; O'Faolain, Liam; Li, Juntao; Krauss, Thomas F.; Eich, Manfred (SPIE, 2014) - Conference item
    The dynamic manipulation of light can be achieved by the interaction of a signal pulse propagating through or reflected from a refractive index front. Both the frequency and the wave vector of the signal are changed in ...
  • Integrated optical auto-correlator based on third-harmonic generation in a silicon photonic crystal waveguide 

    Monat, Christelle; Grillet, Christian; Collins, Matthew; Clark, Alex; Schroeder, Jochen; Xiong, Chunle; Li, Juntao; O'Faolain, Liam; Krauss, Thomas F.; Eggleton, Benjamin J.; Moss, David J. (2014-02-05) - Journal article
    The ability to use coherent light for material science and applications is linked to our ability to measure short optical pulses. While free-space optical methods are well established, achieving this on a chip would offer ...
  • Integration methods for enhanced trapping and spectroscopy in optofluidics 

    Ashok, Praveen Cheriyan (University of St Andrews, 2011-12) - Thesis
    “Lab on a Chip” technologies have revolutionized the field of bio-chemical analytics. The crucial role of optical techniques in this revolution resulted in the emergence of a field by itself, which is popularly termed as ...
  • Mid-infrared photonic crystal waveguides in silicon 

    Reimer, Christian; Nedeljkovic, Milos; Stothard, David J. M.; Esnault, Matthieu O. S.; Reardon, Christopher; O'Faolain, Liam; Dunn, Malcolm; Mashanovich, Goran Z.; Krauss, Thomas F. (2012-12-31) - Journal article
    We demonstrate the design, fabrication and characterization of mid-infrared photonic crystal waveguides on a silicon-on-insulator platform, showing guided modes in the wavelength regime between 2.9 and 3.9 mu m. The ...
  • Multi-photon absorption limits to heralded single photon sources 

    Husko, Chad A.; Clark, Alex S.; Collins, Matthew J.; De Rossi, Alfredo; Combrie, Sylvain; Lehoucq, Gaelle; Rey, Isabella H.; Krauss, Thomas F.; Xiong, Chunle; Eggleton, Benjamin J. (2013-11-04) - Journal article
    Single photons are of paramount importance to future quantum technologies, including quantum communication and computation. Nonlinear photonic devices using parametric processes offer a straightforward route to generating ...
  • Novel semiconductor based light sources 

    McRobbie, Andrew Douglas (University of St Andrews, 2009-06) - Thesis
    The research described in this thesis relates to the design, fabrication and testing of novel semiconductor-based light sources that have been designed for the generation of infra-red light. The thesis is formatted to ...