Nature Photonics contents April 2013 Volume 7 Number 4 pp 257-336

Advertisement Direct writing of photonic and waveguides devices without stitching errors? Visit Raith and learn how traxx and periodixx eliminate stitching effects in Raith electron and ion beam lithography systems. TABLE OF CONTENTS April 2013 Volume 7, Issue 4 Editorial Commentary Research Highlights News and Views Letters Articles Retraction Interview Advertisement DISTINCTLY BETTER MOLECULAR SPEC. With leading choices like Cary UV-Vis, FTIR, and Fluorescence, we’re more qualified than ever to equip you with the precise instrument for your specific challenge. From mobile and routine measurements, to high-end research, Agilent has a Distinctly Better solution for you. See Agilent’s Molecular Spectroscopy portfolio. Subscribe   Facebook   RSS   Recommend to library   Twitter   Advertisement e-Futures: beyond Moore's Law 13-14 May 2013, The Royal Society, 6-9 Carlton House Terrace, London, SW1Y 5AG Royal Society scientific discussion meeting featuring leading international speakers to discuss microelectronics and its diverse future applications for communications technologies, optical, chemical and biomedical systems. Full programme details and registration   Advertisement Submit your next paper to Nature Photonics The Nature Photonics editorial team welcomes contributions from academic, industrial and government sectors across all areas of photonics and optoelectronics. For the Guide to Authors and online submission details click here   Editorial Top Presentation of science   p257 doi:10.1038/nphoton.2013.77 Are exaggeration and overselling problems in optics? Commentary Top The future is fibre accelerators   pp258 - 261 Gerard Mourou, Bill Brocklesby, Toshiki Tajima and Jens Limpert doi:10.1038/nphoton.2013.75 Could massive arrays of thousands of fibre lasers be the driving force behind next-generation particle accelerators? The International Coherent Amplification Network project believes so and is currently performing a feasibility study. Research Highlights Top Phased arrays: Dense integration | Resonators: Low-loss phased arrays | Imaging: In vivo tracking | Solar cells: Nanowire efficiency boost | Laser cooling: Semiconductor success | Attosecond optics: Space-time characterization | Geometric optics: Fractional spiral zone plates | X-ray sources: Plasmonic photocathode | Quantum cascade lasers: Concentric circular gratings | Optical circuit: Spin-photon interface News and Views Top Silicon photonics: Nanocavity brightens silicon   pp264 - 265 Masayuki Fujita doi:10.1038/nphoton.2013.65 Despite great efforts to develop silicon-based optoelectronic devices, efficient photon emission from silicon still remains an elusive goal. Nanocavities could offer a path towards efficient silicon light emitters through strong optical confinement. See also: Letter by Cho et al. Acousto-optic imaging: Merging the best of two worlds   pp265 - 267 Geoffroy Lerosey and Mathias Fink doi:10.1038/nphoton.2013.74 The combination of ultrasound and optics, together with statistics, now permits light focusing and imaging deep inside strongly scattering media at the optical diffraction limit. See also: Article by Judkewitz et al. Bioimaging: Lab on a DVD   p267 Oliver Graydon doi:10.1038/nphoton.2013.64 Photonic crystals: Achieving robust Weyl points   pp268 - 269 Jason Fleischer doi:10.1038/nphoton.2013.73 The isolated symmetry points of photonic graphene are unstable in three dimensions. Researchers have now proposed topologically robust points by using minimal surfaces and employing symmetry-breaking ideas from quantum field theory. See also: Article by Lu et al. Frequency combs: The purest microwave oscillations   pp269 - 271 Enrico Rubiola and Giorgio Santarelli doi:10.1038/nphoton.2013.79 A new femtosecond frequency comb scheme is capable of generating microwave signals at a noise level below the shot noise of light. See also: Letter by Quinlan et al. Anderson localization: The role of quantum symmetries   pp271 - 273 Andrea Fratalocchi doi:10.1038/nphoton.2013.72 Experiments with a quantum simulator made from an integrated optical circuit reveal that bosons and fermions react to disorder in different ways, experiencing different strengths of Anderson localization. See also: Article by Crespi et al. Photonics JOBS of the week Multiple MSc and PhD Student Positions -- Optics and Photonics Masdar Institute of Science & Technology Laser Specialist (PhD) Xelvin Zuid B.V. Laboratory Head in Solid State Analytics F. Hoffmann-La Roche AG Laser Development Engineer Amplitude Systèmes Postdoctoral Fellowship – Chemical Biology Division New England Biolabs, Inc. More Science jobs from Photonics EVENT Advanced Photonics 07.12.13 Rio Grande, Puerto Rico More science events from Letters Top Functional patterned multiphoton excitation deep inside scattering tissue   pp274 - 278 Eirini Papagiakoumou, Aurélien Bègue, Ben Leshem, Osip Schwartz, Brandon M. Stell, Jonathan Bradley, Dan Oron and Valentina Emiliani doi:10.1038/nphoton.2013.9 By combining the techniques of temporal focusing and generalized phase contrast researchers are able to preserve the shape of spatial patterns of light deep inside scattering brain slices. This approach is shown to photoactivate the light-sensitive protein channelrhodopsin-2 with single-cell precision and millisecond temporal resolution. Towards high-capacity fibre-optic communications at the speed of light in vacuum   pp279 - 284 F. Poletti, N. V. Wheeler, M. N. Petrovich, N. Baddela, E. Numkam Fokoua, J. R. Hayes, D. R. Gray, Z. Li, R. Slavik and D. J. Richardson doi:10.1038/nphoton.2013.45 Researcher reports data transmission in 37 × 40 Gbit s−1 channels at 99.7% of the speed of light in vacuum in a fundamentally improved hollow-core photonic bandgap fibre with a record low loss of 3.5 dB km−1 and a wide bandwidth of 160 nm. Silicon coupled with plasmon nanocavities generates bright visible hot luminescence   pp285 - 289 Chang-Hee Cho, Carlos O. Aspetti, Joohee Park and Ritesh Agarwal doi:10.1038/nphoton.2013.25 Researchers obtain bright visible light emission from silicon coupled with plasmon nanocavities due to non-thermal carrier recombination. The team reports an enhanced emission quantum efficiency and the concept is promising for developing monolithically integrated light sources on conventional microchips. See also: News and Views by Fujita Exploiting shot noise correlations in the photodetection of ultrashort optical pulse trains   pp290 - 293 F. Quinlan, T. M. Fortier, H. Jiang, A. Hati, C. Nelson, Y. Fu, J. C. Campbell and S. A. Diddams doi:10.1038/nphoton.2013.33 Shot noise originates from the discrete nature of optical field detection. By exploiting correlations in the shot-noise spectrum of optical pulse trains, scientists improve shot-noise-limited optical pulse timing measurements by several orders of magnitude. A photodetected pulse train timing noise floor at an unprecedented 25 zs Hz-1/2 is reported. See also: News and Views by Rubiola & Santarelli Articles Top Weyl points and line nodes in gyroid photonic crystals   pp294 - 299 Ling Lu, Liang Fu, John D. Joannopoulos and Marin Soljačić doi:10.1038/nphoton.2013.42 Materials exhibiting three-dimensional (3D) linear dispersion relations between frequency and wavevector are expected to display a wide range of interesting phenomena. 3D linear point degeneracies between two bands ("Weyl points") have yet to be observed. Based on analytical and numerical analysis, researchers predict Weyl point formation in 3D photonic crystals. See also: News and Views by Fleischer Speckle-scale focusing in the diffusive regime with time reversal of variance-encoded light (TROVE)   pp300 - 305 Benjamin Judkewitz, Ying Min Wang, Roarke Horstmeyer, Alexandre Mathy and Changhuei Yang doi:10.1038/nphoton.2013.31 Scientists introduce an approach, time reversal of variance-encoded light (TROVE), that can demix spatial modes within an ultrasound focus inside scattering media, breaking the resolution barrier imposed by the ultrasound. Optical focusing and imaging with diffuse light at a speckle-scale lateral resolution of ~5 µm is achieved. See also: News and Views by Lerosey & Fink Single-nanowire solar cells beyond the Shockley-Queisser limit   pp306 - 310 Peter Krogstrup, Henrik Ingerslev Jorgensen, Martin Heiss, Olivier Demichel, Jeppe V. Holm, Martin Aagesen, Jesper Nygard and Anna Fontcuberta i Morral doi:10.1038/nphoton.2013.32 The light concentrating properties of single p-i-n GaAs nanowires are shown to result in far greater photocurrent densities than expected under one sun illumination. The results suggest that such cells could in principle operate with power conversion efficiencies beyond the Shockley-Queisser limit. Quantum teleportation using a light-emitting diode   pp311 - 315 J. Nilsson, R. M. Stevenson, K. H. A. Chan, J. Skiba-Szymanska, M. Lucamarini, M. B. Ward, A. J. Bennett, C. L. Salter, I. Farrer, D. A. Ritchie and A. J. Shields doi:10.1038/nphoton.2013.10 Researchers demonstrate quantum teleportation of six general states using an entangled-light-emitting diode consisting of an InAs quantum dot. The emission wavelength of quantum dots is readily tunable using electric fields. The average teleportation fidelity of 0.704±0.016 exceeds the limit possible with classical light, proving the quantum nature of the teleportation. Full characterization of polarization states of light via direct measurement   pp316 - 321 Jeff Z. Salvail, Megan Agnew, Allan S. Johnson, Eliot Bolduc, Jonathan Leach and Robert W. Boyd doi:10.1038/nphoton.2013.24 Researchers report the first direct measurements of the wavefunction and Dirac distributions for polarization states of light. Their implementation determines the general description of the pure state of a qubit. This technique is simple, fast and general, and has an advantage over the conventional approach of performing quantum state tomography. Anderson localization of entangled photons in an integrated quantum walk   pp322 - 328 Andrea Crespi, Roberto Osellame, Roberta Ramponi, Vittorio Giovannetti, Rosario Fazio, Linda Sansoni, Francesco De Nicola, Fabio Sciarrino and Paolo Mataloni doi:10.1038/nphoton.2013.26 Researchers observe Anderson localization for pairs of polarization-entangled photons in a discrete quantum walk affected by position-dependent disorder. By exploiting polarization entanglement of photons to simulate different quantum statistics, they experimentally investigate the interplay between the Anderson localization mechanism and the bosonic/fermionic symmetry of the wave function. See also: News and Views by Fratalocchi Quantum control of a spin qubit coupled to a photonic crystal cavity   pp329 - 334 Samuel G. Carter, Timothy M. Sweeney, Mijin Kim, Chul Soo Kim, Dmitry Solenov, Sophia E. Economou, Thomas L. Reinecke, Lily Yang, Allan S. Bracker and Daniel Gammon doi:10.1038/nphoton.2013.41 Using a long-lived quantum-dot spin qubit coupled to a GaAs-based photonic crystal cavity, researchers demonstrate complete quantum control of an electron spin qubit. By cleverly controlling the charge state of the InAs quantum dot using laser pulses, optical initialization, control and readout of an electron spin are achieved. See also: Interview with Samuel Carter Retraction Top Retraction: Greatly enhanced continuous-wave terahertz emission by nano-electrodes in a photoconductive photomixer   pp334 - 344 H. Tanoto, J. H. Teng, Q. Y. Wu, Z. N. Chen, S. A. Maier, B. Wang, C. C. Chum, G. Y. Si and A. J. Danner doi:10.1038/nphoton.2013.81 Interview Top Flying qubit carrying a spin qubit   p336 Interview with Samuel Carter doi:10.1038/nphoton.2013.78 Complete quantum control of an electron spin qubit can be achieved using a long-lived quantum-dot spin qubit coupled to a GaAs-based photonic-crystal cavity. Samuel Carter from the Naval Research Laboratory says that this system could be used as a node in a quantum network. See also: Article by Carter et al. Top Advertisement Subscribe to Nature Photonics Providing a unique forum for all aspects of photonics and opto- electronics. Subscribe today and ensure you have access to the latest original research, Commentaries, Research Highlights, News & Views, Reviews and Correspondence published in the journal. Subscribe here.   Natureevents is a fully searchable, multi-disciplinary database designed to maximise exposure for events organisers. The contents of the Natureevents Directory are now live. The digital version is available here. 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