Table of contents



Embracing mobility p127



Research Highlights

Our choice from the recent literature pp128 - 129



News and Views

Nonlinear optics: Terahertz Kerr effect pp131 - 132

Eric Freysz & Jérôme Degert


Quantum optics: Towards efficient quantum sources pp132 - 134

Stefan Strauf


Solar energy: Ferroelectric photovoltaics pp134 - 135

Haitao Huang


Biophotonics: Selective disinfection p136

Rachel Won


Quantum optics: Repairing quadrature entanglement pp136 - 138

Alexei Ourjoumtsev


Quantum optics: Enhanced quantum light generation pp138 - 140

R. Jason Jones


Terahertz technology: Endless applications p140

Noriaki Horiuchi




Laser cooling of solids to cryogenic temperatures pp161 - 164

Denis V. Seletskiy, Seth D. Melgaard, Stefano Bigotta, Alberto Di Lieto, Mauro Tonelli & Mansoor Sheik-Bahae


By exploiting the Stark manifold resonance in a crystalline host, scientists report laser cooling of ytterbium-doped LiYF4 crystals from room temperature to ~155 K, with a cooling power of 90 mW. This is the lowest temperature achieved without using cryogens or mechanical refrigeration, surpassing the performance of multistage Peltier coolers.

Subject Category: Fundamental optical physics

Quasi-periodic distributed feedback laser pp165 - 169

Lukas Mahler, Alessandro Tredicucci, Fabio Beltram, Christoph Walther, Jérôme Faist, Harvey E. Beere, David A. Ritchie & Diederik S. Wiersma


Researchers have constructed a terahertz quantum cascade laser using quasi-periodic distributed feedback gratings based on the Fibonacci sequence. Features that go beyond traditional distributed feedback lasers are demonstrated, such as directional output independent of the emission frequency and multicolour operation.

Subject Category: Lasers, LEDs and light sources

Ultraviolet enhancement cavity for ultrafast nonlinear optics and high-rate multiphoton entanglement experiments pp170 - 173

Roland Krischek, Witlef Wieczorek, Akira Ozawa, Nikolai Kiesel, Patrick Michelberger, Thomas Udem & Harald Weinfurter


The first enhancement cavity for femtosecond ultraviolet pulses is demonstrated. More than 7 W of average ultraviolet power at an 81 MHz repetition rate, available to pump a nonlinear crystal inside the cavity, is exploited in an implementation of a powerful source for high-rate experiments with entangled multiphoton states.

Subject Categories: Ultrafast photonics | Nonlinear optics | Quantum optics

See also: News and Views by Jones

A highly efficient single-photon source based on a quantum dot in a photonic nanowire pp174 - 177

Julien Claudon, Joël Bleuse, Nitin Singh Malik, Maela Bazin, Périne Jaffrennou, Niels Gregersen, Christophe Sauvan, Philippe Lalanne & Jean-Michel Gérard


The lack of effcient solid-state sources of single photons is impeding the further development of many fields including quantum communication, quantum information processing and metrology. Using an InAs quantum dot embedded in a GaAs photonic nanowire with carefully tailored ends, researchers demonstrate a record single-photon source effciency of 0.72 under optical pumping.

Subject Categories: Quantum optics | Lasers, LEDs and light sources

See also: News and Views by Strauf

Entanglement distillation from Gaussian input states pp178 - 181

Hiroki Takahashi, Jonas S. Neergaard-Nielsen, Makoto Takeuchi, Masahiro Takeoka, Kazuhiro Hayasaka, Akira Furusawa & Masahide Sasaki


Distillation of entangled photons is essential for applications such as long-distance quantum communication and high-fidelity quantum teleportation. Distillation from Gaussian input states is experimentally realized, resulting in a large gain in entanglement.

Subject Category: Quantum optics

See also: News and Views by Ourjoumtsev



An ultra-small, low-power, all-optical flip-flop memory on a silicon chip pp182 - 187

Liu Liu, Rajesh Kumar, Koen Huybrechts, Thijs Spuesens, Günther Roelkens, Erik-Jan Geluk, Tjibbe de Vries, Philippe Regreny, Dries Van Thourhout, Roel Baets & Geert Morthier


Scientists demonstrate that a single 7.5-μm-diameter microdisk laser coupled to a silicon-on-insulator wire waveguide can work as an all-optical flip-flop memory. Under a continuous bias of 3.5 mA, flip-flop operation is demonstrated using optical triggering pulses of 1.8 fJ and with a switching time of 60 ps. This device is attractive for on-chip all-optical signal buffering, switching, and processing.

Subject Categories: Optoelectronic devices and components | Nanophotonics

Aperiodic volume optics pp188 - 193

Tim D. Gerke & Rafael Piestun


Fine control over the material structure within a volume gives rise to new physical phenomena and more freedom for designing spatial, spectral and temporal functions. A three-dimensional scattering approach to the design of aperiodic volume optical elements is presented, expanding the traditional capabilities of volume holography, photonic crystals and diffractive optics.

Subject Categories: Imaging and sensing | Fundamental optical physics



Volume optics p194

Interview with Rafael Piestun


A new method for designing aperiodic volume optical elements will offer researchers more degrees of freedom in the design of optical devices. Rafael Piestun explained to Nature Photonics how this method may lead to a myriad of applications in beam-shaping and imaging.


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