Now showing items 1-20 of 20

  • An all-optical feedback assisted steady state of an optomechanical array 

    Joshi, Chaitanya; Akram, Uzma; Milburn, G. J. (2014-02-05) - Journal article
    We explore the effect of all-optical feedback on the steady state dynamics of optomechanical arrays arising from various topologies. First we consider an array comprised of a pair of independent optomechanical cavities ...
  • Bimodal winter haul-out patterns of adult Weddell seals (Leptonychotes weddellii) in the southern Weddell Sea 

    Boehme, Lars; Baker, Amy; Fedak, Mike; Årthun, Marius; Nicholls, Keith; Robinson, Patrick; Costa, Dan; Biuw, Martin; Photopoulou, Theoni (2016-05-19) - Journal article
    Hauling out is an essential component of pinniped life-history. Haul-out behaviour may be affected by biological (e.g. sex, age and condition) and physical factors (e.g. food availability and environmental conditions), and ...
  • Coherence dynamics and quantum-to-classical crossover in an exciton-cavity system in the quantum strong coupling regime 

    Kasprzak, J.; Sivalertporn, K.; Albert, F.; Schneider, C.; Höfling, Sven; Kamp, M.; Forchel, A.; Reitzenstein, S.; Muljarov, E. A.; Langbein, W. (2013-04-22) - Journal article
    Interaction between light and matter generates optical nonlinearities, which are particularly pronounced in the quantum strong coupling regime. When a single bosonic mode couples to a single fermionic mode, a Jaynes-Cummings ...
  • Creating and probing of a perfect vortex in situ with an optically trapped particle 

    Chen, Mingzhou; Mazilu, Michael; Arita, Yoshihiko; Wright, Ewan M.; Dholakia, Kishan (2015-02) - Journal article
    We experimentally create a 'perfect' vortex beam, which has a uniform ring profile and fixed radius. In contrast with other vortex fields, the intensity profile is independent of its topological charge. We then correct ...
  • Design and applications of flexible photonic membranes 

    Reader-Harris, Peter; Kirkpatrick, Blair C.; Di Falco, Andrea (SPIE, 2014-02-01) - Conference item
    In this paper we present the design and applications of flexible photonic membranes. We discuss their use as versatile photonic layers in the framework of lab-on-fibre applications, specifically focusing on the design of ...
  • Dicke phase transition with multiple superradiant states in quantum chaotic resonators 

    Liu, C.; Di Falco, A.; Fratalocchi, A. (2014-06-12) - Journal article
    We experimentally investigate the Dicke phase transition in chaotic optical resonators realized with two-dimensional photonics crystals. This setup circumvents the constraints of the system originally investigated by Dicke ...
  • Effect of the radial and azimuthal mode indices of a partially coherent vortex field upon a spatial correlation singularity 

    Yang, Yuanjie; Chen, Mingzhou; Mazilu, Michael; Mourka, Areti; Liu, Yi-Dong; Dholakia, Kishan (2013-11-26) - Journal article
    The existence of a spatial correlation singularity or a ring dislocation in the spatial coherence function when a vortex is present has been demonstrated recently. Here, we investigate how the spatial correlation singularity ...
  • Entanglement concentration with quantum nondemolition Hamiltonians 

    Tatham, Richard; Korolkova, Natalia (2014-01-09) - Journal article
    We devise and examine two procrustean entanglement concentration schemes using quantum nondemolition (QND) interaction Hamiltonians in the continuous variable regime, applicable for light, for atomic ensembles or in a ...
  • Evidence for subwavelength imaging with positive refraction 

    Ma, Yun Gui; Sahebdivan, Sahar; Ong, C. K.; Tyc, Tomas; Leonhardt, Ulf (2011-03-09) - Journal article
    The resolution of lenses is normally limited by the wave nature of light. Imaging with perfect resolution was believed to rely on negative refraction, but here we present experimental evidence for subwavelength imaging ...
  • Exploiting multimode waveguides for pure fibre based fluorescence imaging 

    Cizmar, Tomas; Dholakia, Kishan (SPIE, 2013-03-22) - Conference item
    There has been an immense drive in modern microscopy towards miniaturisation and fibre based technology. This has been necessitated by the need to access hostile or difficult environments particularly in-situ and in-vivo. ...
  • 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 ...
  • Independent optical excitation of distinct neural populations 

    Klapoetke, Nathan C; Murata, Yasunobu; Kim, Sung Soo; Pulver, Stefan R; Birdsey-Benson, Amanda; Cho, Yong Ku; Morimoto, Tania K; Chuong, Amy S; Carpenter, Eric J; Tian, Zhijian; Wang, Jun; Xie, Yinlong; Yan, Zhixiang; Zhang, Yong; Chow, Brian Y; Surek, Barbara; Melkonian, Michael; Jayaraman, Vivek; Constantine-Paton, Martha; Wong, Gane Ka-Shu; Boyden, Edward S (2014-03) - Journal article
    Optogenetic tools enable examination of how specific cell types contribute to brain circuit functions. A long-standing question is whether it is possible to independently activate two distinct neural populations in mammalian ...
  • 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 ...
  • The influence of water motion on the growth rate of the kelp Laminaria digitata 

    Kregting, Louise; Blight, Andrew J.; Elsäßer, Björn; Savidge, Graham (2016-05) - Journal article
    The shallow water kelp Laminaria digitata, abundant in coastal zones of the North Atlantic, is exposed to a range of hydrodynamic environments that makes it ideal for assessing the role of water motion on their growth rate. ...
  • Living with Durham Cathedral : understanding the dynamic relationships between a community and their cathedral 

    Calvert, Arran James (University of St Andrews, 2017-06-29) - Thesis
    Cathedrals today are no longer sites of just religious worship, they must be many things to many people such as tourist attractions, heritage centres, and meeting places. Today, Durham Cathedral in the north-east of England ...
  • Optical Eigenmodes; exploiting the quadratic nature of the energy flux and of scattering interactions 

    Mazilu, M.; Baumgartl, J.; Kosmeier, S.; Dholakia, K. (2011-01-17) - Journal article
    We report a mathematically rigorous technique which facilitates the optimization of various optical properties of electromagnetic fields in free space and including scattering interactions. The technique exploits the ...
  • Optical trapping with a perfect vortex beam 

    Chen, Mingzhou; Mazilu, Michael; Arita, Yoshihiko; Wright, Ewan M.; Dholakia, Kishan (SPIE, 2014-09-16) - Conference item
    Vortex beams with different topological charge usually have different profiles and radii of peak intensity. This introduces a degree of complexity the fair study of the nature of optical OAM (orbital angular momentum). To ...
  • Photonic crystal interfaces: a design-driven approach 

    Ayre, Melanie (University of St Andrews, 2006-06) - Thesis
    Photonic Crystal structures have been heralded as a disruptive technology for the miniaturization of opto-electronic devices, offering as they do the possibility of guiding and manipulating light in sub-micron scale ...
  • Simulating ultracold matter: horizons and slow light 

    Farrell, Conor (University of St Andrews, 2008-06-19) - Thesis
    This thesis explores the links between different ways of modelling the physical world. Finite difference numerical simulations may be used to encode the behaviour of physical systems, allowing us to gain insight into their ...
  • Visualization of the birth of an optical vortex using diffraction from a triangular aperture 

    Mourka, A.; Baumgartl, J.; Shanor, C.; Dholakia, K.; Wright, E. M. (2011-03-28) - Journal article
    The study and application of optical vortices have gained significant prominence over the last two decades. An interesting challenge remains the determination of the azimuthal index (topological charge) l of an optical ...