Nature Photonics contents September 2012 Volume 6 Number 9 pp 567-636

TABLE OF CONTENTS September 2012 Volume 6, Issue 9 Editorial Commentary Books and Arts Research Highlights News and Views Letters Articles Interview Subscribe   Facebook   RSS   Recommend to library   Twitter   Advertisement Nature Insight: Chemistry and Energy This Insight focuses on the developments in solar energy, water-based methods of electricity generation and the production of biofuels. Access the Insight free online for two months. Produced with support from: TOTAL   Editorial Top Breaking down barriers   p567 doi:10.1038/nphoton.2012.230 Closer collaboration between physicists, engineers and biologists is vital for the future success of biophotonics. Commentary Top Laserlab Europe expands in third phase   pp568 - 570 David Pile doi:10.1038/nphoton.2012.219 The consortium that brought together laser research institutions from across Europe has been extended for three more years. The geographical expansion of the group, particularly in central and Eastern Europe and scientifically less well-developed countries, paints a picture for photonics in Europe. Books and Arts Top New titles at a glance   p571 Fourier Modal Method and Its Applications in Computational Nanophotonics by Hwi Kim doi:10.1038/nphoton.2012.208 Research Highlights Top Nonlinear optics: Negative-frequency mode | Optofluidics: Reconfigurable cavities | Art conservation: Quasi-reflectography | Semiconductor lasers: A steady sweep | Plasmonics: Photorefractive control | Laser scanners: No moving parts | Photonic computing: Mimicking the brain | Light sources: Sun-powered lasers | Subwavelength imaging: Polychromatic metalens | Biophotonics: Low-power nanosurgery News and Views Top X-ray imaging: High-resolution surface structures   pp574 - 575 Adrian P. Mancuso and Garth J. Williams doi:10.1038/nphoton.2012.209 A three-dimensional imaging technique that harnesses reflected, coherent X-rays promises the ability to image nanomaterials within substrates. See also: Letter by Sun et al. Biophotonics: Photonic crystals aid fish's night vision   p575 Seiji Armstrong doi:10.1038/nphoton.2012.213 Energy transfer: Dye lasers with a difference   pp576 - 577 José M. G. Martinho doi:10.1038/nphoton.2012.210 Scientists have shown that Forster resonance energy transfer can be used to realize new designs of dye laser that offer improved photostability and access to new pumping and emission wavelengths. See also: Article by Cerdán et al. Hybrid silicon lasers: Rubber stamp for silicon photonics   pp577 - 579 Robert W. Kelsall doi:10.1038/nphoton.2012.211 The demonstration of edge- and surface-emitting lasers made by transfer-printing epitaxial layers of compound semiconductors onto silicon substrates creates new opportunities for optoelectronics. See also: Letter by Justice et al. | Article by Yang et al. Quantum optics: Wave-particle superposition   pp579 - 580 Gerardo Adesso and Davide Girolami doi:10.1038/nphoton.2012.214 The implementation of a quantum Wheeler's delayed-choice experiment defies the conventional boundaries set by the complementarity principle and shows photons coherently oscillating between particle and wave behaviours in a single experimental set-up. See also: Letter by Tang et al. Photonics JOBS of the week Director of Center for Photonics and Nanoelectronics Lehigh University PhD Positions in Nanochemistry (Nanocrystals - Quantum Dots) at the Italian Institute of Technology Istituto Italiano di Tecnologia Professorship (W3) in Experimental Physics Bielefeld University Full professor position in Optics-Bioimaging-Neurophotonics University Paris Descartes More Science jobs from Photonics EVENT Latin American Optics & Photonics Conference 10.-13.11.12 Sao Sebastiao, Brazil More science events from Letters Top Maximal energy transport through disordered media with the implementation of transmission eigenchannels   pp583 - 587 Moonseok Kim, Youngwoon Choi, Changhyeong Yoon, Wonjun Choi, Jaisoon Kim, Q-Han Park and Wonshik Choi doi:10.1038/nphoton.2012.159 Researchers realize transmission eigenchannels in a disordered medium and demonstrate that a single eigenchannel can transport 3.99 times more energy than uncontrolled waves. This work opens up new avenues for enhancing light-energy delivery to biological tissues and controlling the lasing threshold in random lasers. Three-dimensional coherent X-ray surface scattering imaging near total external reflection   pp588 - 592 Tao Sun, Zhang Jiang, Joseph Strzalka, Leonidas Ocola and Jin Wang doi:10.1038/nphoton.2012.178 Researchers demonstrate coherent X-ray surface scattering imaging in a grazing-incidence geometry that takes advantage of enhanced X-ray surface scattering and interference near total external reflection. Surface patterns are reconstructed in three dimensions with nanometre resolution. The approach has applications in the analysis of buried nano-electronic and nanophotonic structures. See also: News and Views by Mancuso & Williams Enhanced power-conversion efficiency in polymer solar cells using an inverted device structure   pp593 - 597 Zhicai He, Chengmei Zhong, Shijian Su, Miao Xu, Hongbin Wu and Yong Cao doi:10.1038/nphoton.2012.190 Polymer solar cells are lightweight and may represent a low-cost source of energy, although efficiency still prohibits many practical applications. Here researchers demonstrate polymer solar cells with a certified efficiency of 9.2%. This is achieved by employing an inverted structure that aids photogenerated charge-carrier collection and photon harvesting. Observation of one-way Einstein-Podolsky-Rosen steering   pp598 - 601 Vitus Händchen, Tobias Eberle, Sebastian Steinlechner, Aiko Samblowski, Torsten Franz, Reinhard F. Werner & Roman Schnabel doi:10.1038/nphoton.2012.202 Recent theory predicts that Einstein-Podolsky-Rosen arguments enable an effect in which one party can steer the other but not the converse. Researchers have now demonstrated this one-way steering effect with two entangled Gaussian modes of light, potentially opening up a new field of applications in quantum information. Realization of quantum Wheeler's delayed-choice experiment   pp602 - 606 Jian-Shun Tang, Yu-Long Li, Xiao-Ye Xu, Guo-Yong Xiang, Chuan-Feng Li and Guang-Can Guo doi:10.1038/nphoton.2012.179 Researchers experimentally realize the quantum delayed-choice experiment and show that the quantum wave-particle superposition is clearly different from the classical mixture by comparing interference fringes under various conditions. This work reveals the deep relationship between the complementarity principle and the superposition principle of light. See also: News and Views by Adesso & Girolami Ultrafast all-optical switching by single photons   pp607 - 611 Thomas Volz, Andreas Reinhard, Martin Winger, Antonio Badolato, Kevin J. Hennessy, Evelyn L. Hu and Ataç Imamoğlu doi:10.1038/nphoton.2012.181 Researchers report the first demonstration of an ultrafast all-optical switch in the single-photon regime. The device, which consists of an InAs/GaAs quantum dot in a photonic crystal defect cavity, exhibits a coherent coupling constant of 141 meV and a quality factor of 25,000. The overall switching time is around 50 ps. Wafer-scale integration of group III-V lasers on silicon using transfer printing of epitaxial layers   pp612 - 616 John Justice, Chris Bower, Matthew Meitl, Marcus B. Mooney, Mark A. Gubbins and Brian Corbett doi:10.1038/nphoton.2012.204 The realization of GaAs lasers on a silicon substrate using a print transfer process offers an alternative wafer-bonding technique for the hybrid integration of optoelectronics. See also: News and Views by Kelsall Articles Top Transfer-printed stacked nanomembrane lasers on silicon   pp617 - 622 Hongjun Yang, Deyin Zhao, Santhad Chuwongin, Jung-Hun Seo, Weiquan Yang, Yichen Shuai, Jesper Berggren, Mattias Hammar, Zhenqiang Ma and Weidong Zhou doi:10.1038/nphoton.2012.160 A hybrid laser that combines silicon photonic-crystal reflectors with transfer-printed InGaAsP quantum wells offers a convenient means of realizing surface-emitting lasers on silicon. See also: News and Views by Kelsall FRET-assisted laser emission in colloidal suspensions of dye-doped latex nanoparticles   pp623 - 628 Luis Cerdán, Eduardo Enciso, Virginia Martín, Jorge Bañuelos, Iñigo López-Arbeloa, Angel Costela & Inmaculada García-Moreno doi:10.1038/nphoton.2012.201 Researchers show that Forster resonance energy transfer between two different dyes makes it possible to realize an efficient and stable laser for applications in biophotonics. See also: News and Views by Martinho Sapphire-derived all-glass optical fibres   pp629 - 635 P. Dragic, T. Hawkins, P. Foy, S. Morris and J. Ballato doi:10.1038/nphoton.2012.182 Optical fibres heavily doped with alumina are shown to exhibit an exceptionally low Brillouin gain coefficient and an athermal Brillouin frequency response. Such fibres could prove useful for applications that employ fibre sensing or require high-power fibre laser systems. See also: Interview with Peter Dragic & JohnBallato Interview Top Alumina aplenty   p636 Interview with Peter Dragic and John Ballato doi:10.1038/nphoton.2012.212 Brillouin scattering threatens to limit continued power-scaling for many fibre applications, but sapphire-derived all-glass fibres with large concentrations of alumina may help to eliminate this problem. Nature Photonics spoke to Peter Dragic and John Ballato to learn more. 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