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Editorial

First step to observing gravitational waves p67

doi:10.1038/nphoton.2016.9

Designed with a laser metrology system, LISA Pathfinder is on track to demonstrate the first in-flight test of low-frequency gravitational wave detection metrology in space.


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Commentary

Standardizing the resolution claims for coherent microscopy pp68 - 71

Roarke Horstmeyer, Rainer Heintzmann, Gabriel Popescu, Laura Waller & Changhuei Yang

doi:10.1038/nphoton.2015.279

The definition and reporting of spatial resolution for coherent imaging methods varies widely in the imaging community. We advocate the use of a standard spoke-pattern imaging target and the mandatory inclusion of information about underlying a priori assumptions.


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Books and Arts

New titles at a glance p72

Tunable Micro-optics By Hans Zappe & Claudia Deppé

doi:10.1038/nphoton.2015.273


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News and Views

Fundamental optical physics: Nonlinear optics rules magnetism pp74 - 75

Behnood G. Ghamsari & Pierre Berini

doi:10.1038/nphoton.2015.272

Dynamic control of magnetization by short laser pulses has recently attracted much interest. The Kerr nonlinearity has now been utilized to modulate the polarization of light at terahertz frequencies.

See also: Letter by Subkhangulov et al.


X-ray photonics: Bending X-rays with nanochannels pp75 - 77

Daniele Pelliccia

doi:10.1038/nphoton.2015.275

X-ray counterparts of visible light optical elements are notoriously difficult to realize because the refractive index of all materials is close to unity. It has now been demonstrated that curved waveguides fabricated on a silicon chip can channel and deflect X-ray beams by consecutive grazing reflections.


Quantum optics: Spooky spectroscopy pp77 - 79

Jean-Pierre Wolf & Yaron Silberberg

doi:10.1038/nphoton.2015.267

The quantum concepts of entanglement and interaction-free measurements are applied to spectroscopy to successfully sense carbon dioxide in air.

See also: Letter by Kalashnikov et al.


Infrared optics: Nanoscale heat p79

David Pile

doi:10.1038/nphoton.2016.1


Lasers: Topological effect p80

Rachel Won

doi:10.1038/nphoton.2015.283


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Review

Lead sulphide nanocrystal photodetector technologies pp81 - 92

Rinku Saran & Richard J. Curry

doi:10.1038/nphoton.2015.280

Concepts and advances of lead sulphide nanocrystal-based photodetector technologies are reviewed.


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Letters

Femtosecond and nanometre visualization of structural dynamics in superheated nanoparticles pp93 - 97

Tais Gorkhover, Sebastian Schorb, Ryan Coffee, Marcus Adolph, Lutz Foucar, Daniela Rupp, Andrew Aquila, John D. Bozek, Sascha W. Epp, Benjamin Erk, Lars Gumprecht, Lotte Holmegaard, Andreas Hartmann, Robert Hartmann, Günter Hauser, Peter Holl, Andre Hömke, Per Johnsson, Nils Kimmel, Kai-Uwe Kühnel, Marc Messerschmidt, Christian Reich, Arnaud Rouzée, Benedikt Rudek, Carlo Schmidt, Joachim Schulz, Heike Soltau, Stephan Stern, Georg Weidenspointner, Bill White, Jochen Küpper, Lothar Strüder, Ilme Schlichting, Joachim Ullrich, Daniel Rolles, Artem Rudenko, Thomas Möller & Christoph Bostedt

doi:10.1038/nphoton.2015.264

Single Xe clusters are superheated using an intense optical laser pulse and the structural evolution is imaged with a single X-ray pulse. Ultrafast surface softening on the nanometre scale is resolved within 100 fs at the vacuum/sample interface.


Infrared spectroscopy with visible light pp98 - 101

Dmitry A. Kalashnikov, Anna V. Paterova, Sergei P. Kulik & Leonid A. Krivitsky

doi:10.1038/nphoton.2015.252

The refractive index and absorption coefficient of a medium in the infrared range are measured using visible spectral range components. The technique relies on nonlinear interference of infrared and visible photons, produced by down-conversion.

See also: News and Views by Wolf & Silberberg


Femtosecond two-photon Rabi oscillations in excited He driven by ultrashort intense laser fields pp102 - 105

M. Fushitani, C.-N. Liu, A. Matsuda, T. Endo, Y. Toida, M. Nagasono, T. Togashi, M. Yabashi, T. Ishikawa, Y. Hikosaka, T. Morishita & A. Hishikawa

doi:10.1038/nphoton.2015.228

Two-photon Rabi oscillations are observed in He on a timescale of 10 fs by utilizing the strong-field phenomenon known as Freeman resonance. The importance of ponderomotive shifts of both the Rydberg states and the ionization limit is highlighted.


Hanbury Brown and Twiss measurements in curved space pp106 - 110

Vincent H. Schultheiss, Sascha Batz & Ulf Peschel

doi:10.1038/nphoton.2015.244

Hanbury Brown and Twiss measurements on speckle patterns propagating along curved surfaces improve understanding of spatial coherence.


Terahertz modulation of the Faraday rotation by laser pulses via the optical Kerr effect pp111 - 114

R. R. Subkhangulov, R. V. Mikhaylovskiy, A. K. Zvezdin, V. V. Kruglyak, Th. Rasing & A. V. Kimel

doi:10.1038/nphoton.2015.249

Terbium gallium garnet is used to demonstrate a new approach to magneto-optical modulation at frequencies up to 1.1 THz.

See also: News and Views by Ghamsari & Berini


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Articles

Laser cooling of organic–inorganic lead halide perovskites pp115 - 121

Son-Tung Ha, Chao Shen, Jun Zhang & Qihua Xiong

doi:10.1038/nphoton.2015.243

Perovskite crystals are shown to be highly efficient materials for optical refrigeration, supporting cooling of up to 58K when exposed to laser light.


Coordinate-targeted fluorescence nanoscopy with multiple off states pp122 - 128

Johann G. Danzl, Sven C. Sidenstein, Carola Gregor, Nicolai T. Urban, Peter Ilgen, Stefan Jakobs & Stefan W. Hell

doi:10.1038/nphoton.2015.266

By exploiting a second off state of a reversibly switchable fluorophore, a general approach that can reduce photobleaching and enhance resolution of coordinate-targeted fluorescence nanoscopy has been demonstrated.


High-gain infrared-to-visible upconversion light-emitting phototransistors pp129 - 134

Hyeonggeun Yu, Doyoung Kim, Jinhyung Lee, Sujin Baek, Jaewoong Lee, Rajiv Singh & Franky So

doi:10.1038/nphoton.2015.270

An optoelectronic device that efficiently converts infrared light to visible light could prove useful for imaging applications.


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Erratum

Erratum: Non-collinear generation of angularly isolated circularly polarized high harmonics p135

Daniel D. Hickstein, Franklin J. Dollar, Patrik Grychtol, Jennifer L. Ellis, Ronny Knut, Carlos Hernández-García, Dmitriy Zusin, Christian Gentry, Justin M. Shaw, Tingting Fan, Kevin M. Dorney, Andreas Becker, Agnieszka Jaroń-Becker, Henry C. Kapteyn, Margaret M. Murnane & Charles G. Durfee

doi:10.1038/nphoton.2015.268


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