Nature Photonics contents August 2012 Volume 6 Number 8 pp499-566

TABLE OF CONTENTS August 2012 Volume 6, Issue 8 Editorial Research Highlights News and Views Correction Review Letters Articles Corrigendum Interview Subscribe   Facebook   RSS   Recommend to library   Twitter   Advertisement Feel like your paper is lost in a sea of submissions? Scientific Reports publishes your research quickly and efficiently, and makes it freely available to the global scientific community. Learn more with our one minute illustrative video.   Editorial Top A farmer or a hunter?   p499 doi:10.1038/nphoton.2012.202 Should researchers be driven by pre-determined goals or by sheer curiosity? This historical topic is still actively debated among the research community. Research Highlights Top Metamaterials: Twisted layers | Quantum information: Teleporting robust cats | Light and matter: Tunable Entanglement | Nonlinear optics: Bessel beams in water | Quantum optics: Phase imprinting in an atomic gas | Sensors: Paper and pencil | Waveguides: Metal-filled fibres | Colourimetry: Combinatorial wetting | Photodetectors: Cerium fluoride UV detector | Photonic crystals: Spectrometer success News and Views Top Nonlinear optics: Graphene-silicon fusion   pp502 - 503 Kinam Kim, Seong-Ho Cho and Chang-Won Lee doi:10.1038/nphoton.2012.177 A single sheet of graphene dramatically changes the nonlinear response of a silicon photonic crystal, enabling ultralow-power optical bistability, self-induced regenerative oscillation and coherent four-wave mixing. Microanalysis: Single-atom X-ray spectroscopy   pp503 - 504 Michael Walls doi:10.1038/nphoton.2012.176 Advances in electron optics and X-ray detection are opening up the periodic table to one of the ultimate goals of microanalysis — single-atom spectroscopy. Free-electron lasers: SACLA hard-X-ray compact FEL   pp505 - 506 Zhirong Huang and Ingolf Lindau doi:10.1038/nphoton.2012.184 The world's second hard-X-ray free-electron laser has now been commissioned in Japan. The facility's compact accelerator and short-period undulator not only minimize space and cost but also ensure excellent output stability. Light transport: Breaking reciprocity   pp506 - 507 Diederik S. Wiersma doi:10.1038/nphoton.2012.187 The reciprocity of light pulse propagation in a disordered photonic structure can be 'switched off' by creating a local, ultrafast nonlinearity. Laser nanofabrication: New regimes for nanoshaping   p508 Noriaki Horiuchi doi:10.1038/nphoton.2012.186 View from... CLEO 2012: Celebrating semiconductor lasers   pp508 - 510 Rachel Won doi:10.1038/nphoton.2012.185 Over the past five decades, breakthroughs in device design and advances in material and growth technologies have transformed semiconductor lasers from laboratory curiosities into practical devices with real-world applications. Photonics JOBS of the week A postdoctoral position in the field of integrated optics and silicon photonics Masdar Institute of Science & Technology Post-doc position in molecular spectroscopy University of Louisville Postdoctoral Researcher -- Nanoelectroncs and Nanomaterials University of Michigan - Shanghai Jiao Tong University Joint Institute Postdoctoral Position in Optics and Biomedical Imaging University of Colorado Anschutz Medical Campus Engineers France-BioImaging More Science jobs from Photonics EVENT SPIE Optics + Photonics 2012 12.-16.08.12 CA, US More science events from Correction Top Modulation instability: Loaded dice  p510 doi:10.1038/nphoton.2012.189 Review Top Artificial photosynthesis for solar water-splitting   pp511 - 518 Yasuhiro Tachibana, Lionel Vayssieres and James R. Durrant doi:10.1038/nphoton.2012.175 Hydrogen from solar-driven water splitting has the potential to provide clean energy. Current progress towards artificial photosynthetic devices is reviewed, with particular focus on visible light active nanostructures. A vision for a future sustainable hydrogen fuel community based on artificial photosynthesis is outlined. Letters Top All-optical wavelength shifting in a semiconductor laser using resonant nonlinearities   pp519 - 524 Julien Madéo, Pierrick Cavalié, Joshua R. Freeman, Nathan Jukam, Jean Maysonnave, Kenneth Maussang, Harvey. E. Beere, David A. Ritchie, Carlo Sirtori, Jérôme Tignon & Sukhdeep S. Dhillon doi:10.1038/nphoton.2012.157 Researchers demonstrate all-optical wavelength conversion based on a resonant nonlinear process within a terahertz quantum cascade laser. The wavelength of the pump beam (812 nm) corresponds to the interband transitions of the laser. The researchers measured a power-conversion efficiency of 0.13% in the range of 812-818 nm, which is the highest value obtained for such a device. Quantum-limited frequency fluctuations in a terahertz laser   pp525 - 528 Miriam S. Vitiello, Luigi Consolino, Saverio Bartalini, Andrea Taschin, Alessandro Tredicucci, Massimo Inguscio and Paolo De Natale doi:10.1038/nphoton.2012.145 Researchers provide experimental evidence of intrinsic linewidths approaching the quantum limit in a GaAs/AlGaAs quantum cascade laser emitting at 2.5 THz. Despite the expected dominant broadening effect induced by thermal photons, the measured intrinsic linewidth is 90 Hz — even narrower than that of a semiconductor laser working at significantly shorter wavelengths. Solution-processed inorganic bulk nano-heterojunctions and their application to solar cells   pp529 - 534 Arup K. Rath, Maria Bernechea, Luis Martinez, F. Pelayo Garcia de Arquer, Johann Osmond and Gerasimos Konstantatos doi:10.1038/nphoton.2012.139 The fabrication of nanoscale p-n junctions from colloidal nanocrystals and quantum dots provides a new architecture for efficient, solution-processed solar cells. Conversion of broadband to narrowband thermal emission through energy recycling   pp535 - 539 Menaka De Zoysa, Takashi Asano, Keita Mochizuki, Ardavan Oskooi, Takuya Inoue and Susumu Noda doi:10.1038/nphoton.2012.146 By constructing a thermal emission control device based on a multiple-quantum-well layer embedded in a two-dimensional photonic crystal, researchers demonstrate that they can convert a broadband thermal emission spectrum into a narrowband spectrum with minimal loss of energy. A compact X-ray free-electron laser emitting in the sub-angstrom region   pp540 - 544 Tetsuya Ishikawa, Hideki Aoyagi, Takao Asaka, Yoshihiro Asano, Noriyoshi Azumi, Teruhiko Bizen, Hiroyasu Ego, Kenji Fukami, Toru Fukui, Yukito Furukawa, Shunji Goto, Hirofumi Hanaki, Toru Hara, Teruaki Hasegawa, Takaki Hatsui, Atsushi Higashiya, Toko Hirono, Naoyasu Hosoda, Miho Ishii, Takahiro Inagaki, Yuichi Inubushi, Toshiro Itoga, Yasumasa Joti, Masahiro Kago, Takashi Kameshima, Hiroaki Kimura, Yoichi Kirihara, Akio Kiyomichi, Toshiaki Kobayashi, Chikara Kondo, Togo Kudo, Hirokazu Maesaka, Xavier M. Maréchal, Takemasa Masuda, Shinichi Matsubara, Takahiro Matsumoto, Tomohiro Matsushita, Sakuo Matsui, Mitsuru Nagasono, Nobuteru Nariyama, Haruhiko Ohashi, Toru Ohata, Takashi Ohshima, Shun Ono, Yuji Otake, Choji Saji, Tatsuyuki Sakurai, Takahiro Sato, Kei Sawada, Takamitsu Seike, Katsutoshi Shirasawa, Takashi Sugimoto, Shinsuke Suzuki, Sunao Takahashi, Hideki Takebe, Kunikazu Takeshita, Kenji Tamasaku, Hitoshi Tanaka, Ryotaro Tanaka, Takashi Tanaka, Tadashi Togashi, Kazuaki Togawa, Atsushi Tokuhisa, Hiromitsu Tomizawa, Kensuke Tono, Shukui Wu, Makina Yabashi, Mitsuhiro Yamaga, Akihiro Yamashita, Kenichi Yanagida, Chao Zhang, Tsumoru Shintake, Hideo Kitamura & Noritaka Kumagai doi:10.1038/nphoton.2012.141 Researchers report sub-angstrom fundamental-wavelength lasing at the SPring-8 Angstrom Compact Free-Electron Laser in Japan. The output has a maximum power of more than 10 GW, a pulse duration of 10-14 s and a lasing wavelength of 0.634 A. See also: News and Views by Huang & Lindau Detection of photons emitted from single erbium atoms in energy-dispersive X-ray spectroscopy   pp545 - 548 Kazu Suenaga, Toshiya Okazaki, Eiji Okunishi and Syo Matsumura doi:10.1038/nphoton.2012.148 Researchers use energy-dispersive X-ray spectroscopy to detect X-ray emission from a single erbium atom. Although the measured intensities are relatively weak, the work may allow single-atom X-ray spectra to be obtained from other atomic species. See also: News and Views by Walls Looking around corners and through thin turbid layers in real time with scattered incoherent light   pp549 - 553 Ori Katz, Eran Small and Yaron Silberberg doi:10.1038/nphoton.2012.150 Researchers show that wavefront shaping enables not only real-time widefield imaging through turbid layers with both coherent and incoherent llumination, but also the imaging of objects outside the line-of-sight using light scattered from diffuse walls. Articles Top Regenerative oscillation and four-wave mixing in graphene optoelectronics   pp554 - 559 T. Gu, N. Petrone, J. F. McMillan, A. van der Zande, M. Yu, G. Q. Lo, D. L. Kwong, J. Hone and C. W. Wong doi:10.1038/nphoton.2012.147 Scientists report the observation of ultralow-power resonant optical bistability, self-induced regenerative oscillations and coherent four-wave mixing in graphene-silicon hybrid optoelectronic devices at cavity recirculating energies of a few femtojoules. The findings indicate the feasibility and versatility of such devices for use in next-generation chip-scale high-speed optical communications, radiofrequency optoelectronics and all-optical signal processing. See also: News and Views by Kim et al. Broadband dye-sensitized upconversion of near-infrared light   pp560 - 564 Wenqiang Zou, Cindy Visser, Jeremio A. Maduro, Maxim S. Pshenichnikov and Jan C. Hummelen doi:10.1038/nphoton.2012.158 Researchers demonstrate an approach for upconverting near-infrared light in solar cells using an organic dye as an antenna for nanoparticles. Increased absorptivity and overall broadening of the upconverter's absorption spectrum enhance the upconversion process by a factor of around 3,300. Corrigendum Top Towards high-speed imaging of infrared photons with bio-inspired nanoarchitectures   p564 Andrew D. Pris, Yogen Utturkar, Cheryl Surman, William G. Morris, Alexey Vert, Sergiy Zalyubovskiy, Tao Deng, Helen T. Ghiradella and Radislav A. Potyrailo doi:10.1038/nphoton.2012.188 Interview Top And then there were two   p566 Interview with Makina Yabashi & Hitoshi Tanaka doi:10.1038/nphoton.2012.183 Researchers around the world now have access to a second hard-X-ray free-electron laser facility: the SPring-8 Angstrom Compact Free-Electron Laser in Japan. Nature Photonics spoke to Makina Yabashi and Hitoshi Tanaka from the facility about their achievements and plans for the future. 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