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Editorial

Photonics West 2014 p265

doi:10.1038/nphoton.2014.76

The convergence of micro-optics and microelectromechanical systems continues to spawn new directions in optics.


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News and Views

Organic light-emitting diodes: Phosphorescence meets its match pp269 - 270

Sebastian Reineke

doi:10.1038/nphoton.2014.78

The advent of novel fluorophores that harness thermally activated energy transfer processes is resulting in a new breed of highly efficient organic light-emitting diodes.

See also: Article by Zhang et al.


Tomography: Movies of evolving objects from a single laser shot p271

Simon Pleasants

doi:10.1038/nphoton.2014.56


Optical physics: Extending filamentation pp271 - 273

Günter Steinmeyer & Carsten Brée

doi:10.1038/nphoton.2014.59

The introduction of a dressing beam to extend the reach of filaments promises a wealth of new applications that extend beyond the laboratory scale.

See also: Letter by Scheller et al.


Quantum plasmonics: Two-plasmon interference pp273 - 275

Michael Steel

doi:10.1038/nphoton.2014.61

A new experiment demonstrates the first unequivocally quantum two-particle interference with surface plasmons. Subwavelength optical quantum information processing may be just around the corner.

See also: Letter by Fakonas et al.


Quantum optics: Entanglement à trois pp275 - 276

Geoff J. Pryde

doi:10.1038/nphoton.2014.60

Guaranteed entanglement sharing over long distances can be verified by violating a Bell inequality. That's a tricky enough proposition in itself, but what if more than two parties are involved?

See also: Letter by Erven et al.


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Review

Hollow-core photonic crystal fibres for gas-based nonlinear optics pp278 - 286

P. St. J. Russell, P. Hölzer, W. Chang, A. Abdolvand & J. C. Travers

doi:10.1038/nphoton.2013.312

Hollow-core photonic crystal fibres are attractive because they exhibit pressure-adjustable normal or anomalous dispersion, low-loss guidance, very low nonlinearity and high damage threshold. This Review overviews nonlinear optical phenomena in gas-filled, hollow-core photonic crystal fibres that may lead to a new generation of versatile and efficient pulse-compression devices and gas-based light sources.


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Letters

Broadband single-photon-level memory in a hollow-core photonic crystal fibre pp287 - 291

M. R. Sprague, P. S. Michelberger, T. F. M. Champion, D. G. England, J. Nunn, X.-M. Jin, W. S. Kolthammer, A. Abdolvand, P. St. J. Russell & I. A. Walmsley

doi:10.1038/nphoton.2014.45

An optical memory is demonstrated in a kagome photonic crystal fibre whose 26-μm-diameter hollow core is loaded with cesium atoms. Gigahertz-bandwidth light is stored using a far-detuned Raman interaction. It has a memory efficiency is 27 ± 1% and a signal-to-noise ratio of 2.6:1 — the highest at the single-photon level of any memory at room temperature.

See also: Interview with Michael Sprague


Experimental three-photon quantum nonlocality under strict locality conditions pp292 - 296

C. Erven, E. Meyer-Scott, K. Fisher, J. Lavoie, B. L. Higgins, Z. Yan, C. J. Pugh, J.-P. Bourgoin, R. Prevedel, L. K. Shalm, L. Richards, N. Gigov, R. Laflamme, G. Weihs, T. Jennewein & K. J. Resch

doi:10.1038/nphoton.2014.50

Violation of the classical bound of the three-particle Mermin inequality by nine standard deviations is experimentally demonstrated by closing both the locality and freedom-of-choice loopholes; only the fair-sampling assumption is required. To achieve this, a light source for producing entangled multiphoton states and measurement technologies for precise timing and efficient detection were developed.

See also: News and Views by Pryde


Externally refuelled optical filaments pp297 - 301

Maik Scheller, Matthew S. Mills, Mohammad-Ali Miri, Weibo Cheng, Jerome V. Moloney, Miroslav Kolesik, Pavel Polynkin & Demetrios N. Christodoulides

doi:10.1038/nphoton.2014.47

Plasma channels induced in air by femtosecond-laser filamentation are useful for many applications, including attosecond physics and spectroscopy and remote sensing. By appropriately employing a surrounding auxiliary dressing beam to continuously supply energy to the filament, the natural range of the plasma column has been extended by at least one order of magnitude.

See also: News and Views by Steinmeyer & Brée


Isotropic three-dimensional super-resolution imaging with a self-bending point spread function pp302 - 306

Shu Jia, Joshua C. Vaughan & Xiaowei Zhuang

doi:10.1038/nphoton.2014.13

By exploiting a self-bending point spread function based on Airy beams, a three-dimensional super-resolution fluorescence imaging is realized. A three-dimensional localization precision in the range 10–15 nm was obtained at an imaging depth of 3 µm from ~2,000 photons per localization.


Tip-enhanced infrared nanospectroscopy via molecular expansion force detection pp307 - 312

Feng Lu, Mingzhou Jin & Mikhail A. Belkin

doi:10.1038/nphoton.2013.373

Mid-infrared spectroscopy with nanometre spatial resolution is highly desired for materials and life sciences applications. A nanoscale mid-infrared spectrometer is demonstrated that detects mechanical forces exerted by molecules on an atomic force microscope tip upon light excitation. It operates under ambient conditions with a high sensitivity and a spatial resolution of better than 25 nm.


X-ray two-photon absorption competing against single and sequential multiphoton processes pp313 - 316

Kenji Tamasaku, Eiji Shigemasa, Yuichi Inubushi, Tetsuo Katayama, Kei Sawada, Hirokatsu Yumoto, Haruhiko Ohashi, Hidekazu Mimura, Makina Yabashi, Kazuto Yamauchi & Tetsuya Ishikawa

doi:10.1038/nphoton.2014.10

The first observation of a third-order process induced by an X-ray beam from a free-electron laser is realized in germanium using a 5.6-keV X-ray beam. Two-photon absorption is confirmed, suggesting that X-ray analogues of other third-order nonlinear processes may be available for exploitation in X-ray experiments.


Two-plasmon quantum interference pp317 - 320

James S. Fakonas, Hyunseok Lee, Yousif A. Kelaita & Harry A. Atwater

doi:10.1038/nphoton.2014.40

Researchers demonstrate unequivocal quantum interference between plasmons in a Hong–Ou–Mandel experiment. The results may be important for quantum information applications of plasmonics.

See also: News and Views by Steel


Optomechanical self-structuring in a cold atomic gas pp321 - 325

G. Labeyrie, E. Tesio, P. M. Gomes, G.-L. Oppo, W. J. Firth, G. R. M. Robb, A. S. Arnold, R. Kaiser & T. Ackemann

doi:10.1038/nphoton.2014.52

A simple experiment enables simultaneous long-range spatial structuring of a cold atomic cloud and an optical pump field, with an adjustable length scale.


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Articles

Efficient blue organic light-emitting diodes employing thermally activated delayed fluorescence pp326 - 332

Qisheng Zhang, Bo Li, Shuping Huang, Hiroko Nomura, Hiroyuki Tanaka & Chihaya Adachi

doi:10.1038/nphoton.2014.12

Blue organic light-emitting diodes that harness thermally activated delayed fluorescence are realized with an external quantum efficiency of 19.5% and reduced roll-off at high luminance.

See also: News and Views by Reineke


Measurement-based noiseless linear amplification for quantum communication pp333 - 338

Helen M. Chrzanowski, Nathan Walk, Syed M. Assad, Jiri Janousek, Sara Hosseini, Timothy C. Ralph, Thomas Symul & Ping Koy Lam

doi:10.1038/nphoton.2014.49

Emulation of noiseless linear amplification of quantum states of light is demonstrated by post-selection of measurement data obtained by heterodyne detection. Using this protocol, Einstein–Podolsky–Rosen entanglement is recovered after its degradation by transmission loss. This protocol is applicable to other quantum communication protocols, including teleportation and remote state preparation.


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Interview

Hollow memories p340

Interview with Michael Sprague

doi:10.1038/nphoton.2014.77

A hollow-core optical fibre filled with warm caesium atoms can temporarily store the properties of photons. Michael Sprague from the University of Oxford, UK, explains to Nature Photonics how this optical memory could be a useful building block for fibre-based quantum optics.

See also: Letter by Sprague et al.


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