Nature Photonics contents June 2014 Volume 8 Number 6 pp421-496

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Advertisement Select Si, Ge, Au and more for Advanced FIB Nanofabrication!  Visit Raith and learn more about FIB Nanofabrication and ionLiNE's new Multi-Species Ion Beam Technology. TABLE OF CONTENTS June 2014 Volume 8, Issue 6 Editorial Research Highlights News and Views Letters Articles Erratum Interview Subscribe   Facebook   RSS   Recommend to library   Twitter   Advertisement Attending the CLEO meeting in San Jose? Visit Nature Photonics at the Nature Publishing Group booth #2123 to: *Take part in our prize draw *Browse and take free sample copies of leading journals from NPG, including Nature and Nature Photonics  *Save up to 30% on personal subscriptions   Editorial Top Dragons' den for photonics   p421 doi:10.1038/nphoton.2014.129 A networking convention for photonics start-ups seeking funding will hold its fourth event in October 2014 at Bordeaux, France. Research Highlights Top Quantum dots: Monitoring charge jumps | Two-dimensional materials: Laser Q-switching | Nonlinear optics: Reversing loss | UV lasers: Narrow VUV pulses | Single-photon sources: Spontaneous answer | Quantum Optics: Multiparticle entanglement | Quantum optics: Higher dimensions | Optical signal processing: Efficient digitization | Plasmonics: Bullseye beaming | Beam shaping: Hollow Gaussian beams News and Views Top Bioimaging: Watching the brain at work   pp425 - 426 Robert J. Cooper doi:10.1038/nphoton.2014.116 It has been 20 years since near-infrared spectroscopy was first used to investigate human brain function. The technique has subsequently been extended to offer high-resolution imaging of the cortex and has now become a viable alternative to functional magnetic resonance imaging. See also: Article by Eggebrecht et al. Photonic-crystal waveguides: Trapping single atoms   p427 Simon Pleasants doi:10.1038/nphoton.2014.131 Quantum emitters: Route to indistinguishable photons   pp427 - 429 Alexander Tartakovskii doi:10.1038/nphoton.2014.117 The dot-to-dot variation of the optical transition frequency makes it impractical to use single-photon sources based on semiconducting quantum dots in quantum computing, which requires indistinguishable photons. This can now be overcome by using coherently scattered single photons from a dot and tuning them using a microcavity. See also: Article by Sweeney et al. Optical physics: Antimatter creation in an X-ray bath   pp429 - 431 Alexander Thomas doi:10.1038/nphoton.2014.118 Laser systems designed for fusion research are able to produce a high density of X-ray photons in a metal cavity. Scientists have now proposed that this environment could be used to create matter from light and test a fundamental prediction of quantum electrodynamics. See also: Letter by Pike et al. View from ... JSAP Spring meeting 2014: Strive for efficiency   pp431 - 432 Noriaki Horiuchi doi:10.1038/nphoton.2014.130 A high energy conversion efficiency and a low fabrication cost are required to make the widespread implementation of solar cells attractive. Researchers are striving to enhance cell performance by developing heterojunction techniques, introducing photonic-crystal structures and proposing new device designs. Photonics JOBS of the week Post-doctoral research position in Photonics for clinical neurology and neonatalogy ICFO - The Institute of Photonic Sciences Researcher position on Physics of nanostructures for photonics and energy Istituto Italiano di Tecnologia (IIT) Pulsed Laser Deposition of Thin Films, USA North Carolina State University (NCSU) Optoelectronics research engineer position in biomedical optics ICFO - The Institute of Photonic Sciences More Science jobs from Letters Top A photon-photon collider in a vacuum hohlraum   pp434 - 436 O. J. Pike, F. Mackenroth, E. G. Hill and S. J. Rose doi:10.1038/nphoton.2014.95 A new /`photon-photon collider/', which may enable elusive Breit-Wheeler pair production in an optics laboratory setting, is predicted. Using this concept, it is potentially possible to produce 105 Breit-Wheeler electron-positron pairs by firing a gamma-ray beam into a high-temperature radiation field of a laser-heated hohlraum cavity. See also: News and Views by Thomas | Interview with Oliver Pike Coherent phase-matched VUV generation by field-controlled bound states   pp437 - 441 Michael Chini, Xiaowei Wang, Yan Cheng, He Wang, Yi Wu et al. doi:10.1038/nphoton.2014.83 Little attention has been devoted to development and characterization of below-threshold harmonic sources, which are critical for extending time-resolved photoemission spectroscopy to megahertz repetition rates and for developing high-average-power vacuum-ultraviolet sources. Now, a new regime of below-threshold harmonic generation accompanied by the bright, coherent emission of vacuum-ultraviolet lines is reported. Articles Top Cavity-stimulated Raman emission from a single quantum dot spin   pp442 - 447 Timothy M. Sweeney, Samuel G. Carter, Allan S. Bracker, Mijin Kim, Chul Soo Kim et al. doi:10.1038/nphoton.2014.84 Cavity-stimulated Raman spin-flip emission is demonstrated by coupling a negatively charged InAs/GaAs quantum dot to a photonic crystal defect cavity. The emission is spectrally narrow and tunable over a range of about 125 GHz. The process can be made spin selective by tuning the scattered photons to be in resonance with the cavity. See also: News and Views by Tartakovskii Mapping distributed brain function and networks with diffuse optical tomography   pp448 - 454 Adam T. Eggebrecht, Silvina L. Ferradal, Amy Robichaux-Viehoever, Mahlega S. Hassanpour, Hamid Dehghani et al. doi:10.1038/nphoton.2014.107 High-resolution diffuse optical tomography employing a large array of light sources and detectors arranged around the head can perform functional brain imaging. It provides an alternative to magnetic resonance imaging for monitoring activity in different areas of the brain. See also: News and Views by Cooper Photodynamic therapy by in situ nonlinear photon conversion   pp455 - 461 A. V. Kachynski, A. Pliss, A. N. Kuzmin, T. Y. Ohulchanskyy, A. Baev et al. doi:10.1038/nphoton.2014.90 An investigation of the use of nonlinear upconversion effects like second-harmonic generation and four-wave mixing within biological tissue indicates that it should be possible to perform photodynamic therapy with near-infrared laser light at greater depths than previously. Terahertz laser frequency combs   pp462 - 467 David Burghoff, Tsung-Yu Kao, Ningren Han, Chun Wang Ivan Chan, Xiaowei Cai et al. doi:10.1038/nphoton.2014.85 Frequency combs based on terahertz quantum cascade lasers, which combine the high power of lasers with the broadband capabilities of pulsed sources, are demonstrated. The frequency combs generate 5 mW of terahertz power covering a frequency range of almost 500 GHz and produce more than 70 lines at 3.5 THz. Comparative analysis of spasers, vertical-cavity surface-emitting lasers and surface-plasmon-emitting diodes   pp468 - 473 Jacob B. Khurgin and Greg Sun doi:10.1038/nphoton.2014.94 Theoretical analysis reveals that spasers do not differ fundamentally from conventional semiconductor lasers; differences are mainly technical and result from loss in the metal. Spasers are shown to have significantly inferior threshold currents and linewidths to those of vertical-cavity surface-emitting lasers, but their speed can be slightly greater. Large-scale integration of wavelength-addressable all-optical memories on a photonic crystal chip   pp474 - 481 Eiichi Kuramochi, Kengo Nozaki, Akihiko Shinya, Koji Takeda, Tomonari Sato et al. doi:10.1038/nphoton.2014.93 Large-scale densely integrated optical memory on a single photonic crystal chip is demonstrated. The wavelength-division-multiplexing (WDM) capabilities of nanophotonic memories are exploited for optical addressing. This work may enable optical random-access memories and a large-scale WDM photonic network-on-chip. Integrated germanium optical interconnects on silicon substrates   pp482 - 488 Papichaya Chaisakul, Delphine Marris-Morini, Jacopo Frigerio, Daniel Chrastina, Mohamed-Said Rouifed et al. doi:10.1038/nphoton.2014.73 The integration of germanium quantum-well devices and low-loss waveguides with silicon substrates shows promise for realizing low-loss, on-chip photonic interconnects. Lead-free solid-state organic-inorganic halide perovskite solar cells   pp489 - 494 Feng Hao, Constantinos C. Stoumpos, Duyen Hanh Cao, Robert P. H. Chang and Mercouri G. Kanatzidis doi:10.1038/nphoton.2014.82 Perovskite solar cells containing tin rather than lead, which is usually employed, are reported. These cells have a power conversion efficiency of 5.7% and retain 80% of their performance over a period of 12 hours. Interview Top Light into matter   p496 Interview with Oliver Pike doi:10.1038/nphoton.2014.115 Oliver Pike explains to Nature Photonics that the so far elusive electron-positron pair production from light may now be possible using existing technology. See also: Letter by Pike et al. Erratum Top Erratum: Experimental realization of a concatenated Greenberger-Horne-Zeilinger state for macroscopic quantum superpositions   p494 He Lu, Luo-Kan Chen, Chang Liu, Ping Xu, Xing-Can Yao et al. doi:10.1038/nphoton.2014.110 Top Advertisement NOW AVAILABLE: Discounts on lab equipment Savings and information - all in one place! Check Marketplace before you buy Browse LAB OFFERS and PRODUCT FOCUS     Natureevents is a fully searchable, multi-disciplinary database designed to maximise exposure for events organisers. The contents of the Natureevents Directory are now live. 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