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Nature Photonics

Kateryna Trofymchuk, Andreas Reisch, Pascal Didier, François Fras, Pierre Gilliot, Yves Mely, Andrey S Klymchenko
Here, we explore the enhancement of single molecule emission by polymeric nano-antenna that can harvest energy from thousands of donor dyes to a single acceptor. In this nano-antenna, the cationic dyes are brought together in very close proximity using bulky counterions, thus enabling ultrafast diffusion of excitation energy (≤30 fs) with minimal losses. Our 60-nm nanoparticles containing >10,000 rhodamine-based donor dyes can efficiently transfer energy to 1-2 acceptors resulting in an antenna effect of ~1,000...
October 2017: Nature Photonics
Onur Tokel, Ahmet Turnali, Ghaith Makey, Parviz Elahi, Tahir Çolakoğlu, Emre Ergeçen, Özgün Yavuz, René Hübner, Mona Zolfaghari Borra, Ihor Pavlov, Alpan Bek, Raşit Turan, Denizhan Koray Kesim, Serhat Tozburun, Serim Ilday, F Ömer Ilday
Silicon is an excellent material for microelectronics and integrated photonics1-3 with untapped potential for mid-IR optics4. Despite broad recognition of the importance of the third dimension5,6, current lithography methods do not allow fabrication of photonic devices and functional microelements directly inside silicon chips. Even relatively simple curved geometries cannot be realised with techniques like reactive ion etching. Embedded optical elements, like in glass7, electronic devices, and better electronic-photonic integration are lacking8...
October 2017: Nature Photonics
F Langer, M Hohenleutner, U Huttner, S W Koch, M Kira, R Huber
High-harmonic (HH) generation in crystalline solids1-6 marks an exciting development, with potential applications in high-efficiency attosecond sources7, all-optical bandstructure reconstruction8,9, and quasiparticle collisions10,11. Although the spectral1-4 and temporal shape5 of the HH intensity has been described microscopically1-6,12, the properties of the underlying HH carrier wave have remained elusive. Here we analyse the train of HH waveforms generated in a crystalline solid by consecutive half cycles of the same driving pulse...
April 2017: Nature Photonics
M Gilles, P-Y Bony, J Garnier, A Picozzi, M Guasoni, J Fatome
Domain walls are topological defects which occur at symmetry-breaking phase transitions. While domain walls have been intensively studied in ferromagnetic materials, where they nucleate at the boundary of neighbouring regions of oppositely aligned magnetic dipoles, their equivalent in optics have not been fully explored so far. Here, we experimentally demonstrate the existence of a universal class of polarization domain walls in the form of localized polarization knots in conventional optical fibres. We exploit their binding properties for optical data transmission beyond the Kerr limits of normally dispersive fibres...
February 2017: Nature Photonics
Qi Pian, Ruoyang Yao, Nattawut Sinsuebphon, Xavier Intes
Spectrally resolved fluorescence lifetime imaging1-3 and spatial multiplexing1,4,5 have offered information content and collection-efficiency boosts in microscopy, but efficient implementations for macroscopic applications are still lacking. An imaging platform based on time-resolved structured light and hyperspectral single-pixel detection has been developed to perform quantitative macroscopic fluorescence lifetime imaging (MFLI) over a large field of view (FOV) and multiple spectral bands simultaneously. The system makes use of three digital micromirror device (DMD)-based spatial light modulators (SLMs) to generate spatial optical bases and reconstruct N by N images over 16 spectral channels with a time-resolved capability (~40 ps temporal resolution) using fewer than N2 optical measurements...
2017: Nature Photonics
Norman Lippok, Martin Villiger, Alexandre Albanese, Eelco F J Meijer, Kwanghun Chung, Timothy P Padera, Sangeeta N Bhatia, Brett E Bouma
Owing to their electromagnetic properties, tunability and biocompatibility, gold nanorods (GNRs) are being investigated as multifunctional probes for a range of biomedical applications. However, detection beyond the reach of traditional fluorescence and two-photon approaches and quantitation of their concentration in biological tissue remain challenging tasks in microscopy. Here we show how the size and aspect ratio that impart GNRs with their plasmonic properties also make them a source of entropy. We report on how depolarization can be exploited as a strategy to visualize GNR diffusion and distribution in biologically relevant scenarios ex vivo, in vitro and in vivo...
2017: Nature Photonics
Nisan Siegel, Vladimir Lupashin, Brian Storrie, Gary Brooker
Fresnel incoherent correlation holography (FINCH) microscopy is a promising approach for high-resolution biological imaging but has so far been limited to use with low-magnification, low-numerical-aperture configurations. We report the use of in-line incoherent interferometers made from uniaxial birefringent α-barium borate (α-BBO) or calcite crystals that overcome the aberrations and distortions present with previous implementations that employed spatial light modulators or gradient refractive index lenses...
December 2016: Nature Photonics
Kyle M Douglass, Christian Sieben, Anna Archetti, Ambroise Lambert, Suliana Manley
No abstract text is available yet for this article.
November 2016: Nature Photonics
Haohua Tu, Yuan Liu, Dmitry Turchinovich, Marina Marjanovic, Jens Lyngsø, Jesper Lægsgaard, Eric J Chaney, Youbo Zhao, Sixian You, William L Wilson, Bingwei Xu, Marcos Dantus, Stephen A Boppart
The preparation, staining, visualization, and interpretation of histological images of tissue is well-accepted as the gold standard process for the diagnosis of disease. These methods were developed historically, and are used ubiquitously in pathology, despite being highly time and labor intensive. Here we introduce a unique optical imaging platform and methodology for label-free multimodal multiphoton microscopy that uses a novel photonic crystal fiber source to generate tailored chemical contrast based on programmable supercontinuum pulses...
August 2016: Nature Photonics
Krishna C Balram, Marcelo I Davanço, Jin Dong Song, Kartik Srinivasan
Optomechanical cavities have been studied for applications ranging from sensing to quantum information science. Here, we develop a platform for nanoscale cavity optomechanical circuits in which optomechanical cavities supporting co-localized 1550 nm photons and 2.4 GHz phonons are combined with photonic and phononic waveguides. Working in GaAs facilitates manipulation of the localized mechanical mode either with a radio frequency (RF) field through the piezo-electric effect, which produces acoustic waves that are routed and coupled to the optomechanical cavity by phononic crystal waveguides, or optically through the strong photoelastic effect...
May 2016: Nature Photonics
Yoav Shechtman, Lucien E Weiss, Adam S Backer, Maurice Y Lee, W E Moerner
Super-resolution microscopy has revolutionized cellular imaging in recent years(1-4). Methods relying on sequential localization of single point emitters enable spatial tracking at ~10-40 nm resolution. Moreover, tracking and imaging in three dimensions is made possible by various techniques, including point-spread-function (PSF) engineering(5-9) -namely, encoding the axial (z) position of a point source in the shape that it creates in the image plane. However, a remaining challenge for localization-microscopy is efficient multicolour imaging - a task of the utmost importance for contextualizing biological data...
2016: Nature Photonics
Mikael P Backlund, Amir Arbabi, Petar N Petrov, Ehsan Arbabi, Saumya Saurabh, Andrei Faraon, W E Moerner
Nanoscale localization of single molecules is a crucial function in several advanced microscopy techniques, including single-molecule tracking and wide-field super-resolution imaging (1). To date, a central consideration of such techniques is how to optimize the precision of molecular localization. However, as these methods continue to push toward the nanometre size scale, an increasingly important concern is the localization accuracy. In particular, single fluorescent molecules emit with an anisotropic radiation pattern of an oscillating electric dipole, which can cause significant localization biases using common estimators (2-5)...
2016: Nature Photonics
Kevin A Twedt, Jie Zou, Marcelo Davanco, Kartik Srinivasan, Jabez J McClelland, Vladimir A Aksyuk
Optical microresonators have proven powerful in a wide range of applications, including cavity quantum electrodynamics(1-3), biosensing(4), microfludics(5), and cavity optomechanics(6-8). Their performance depends critically on the exact distribution of optical energy, confined and shaped by the nanoscale device geometry. Near-field optical probes(9) can image this distribution, but the physical probe necessarily perturbs the near field, which is particularly problematic for sensitive high quality factor resonances(10,11)...
2016: Nature Photonics
Rebecca A B Burton, Aleksandra Klimas, Christina M Ambrosi, Jakub Tomek, Alex Corbett, Emilia Entcheva, Gil Bub
In nature, macroscopic excitation waves(1,2) are found in a diverse range of settings including chemical reactions, metal rust, yeast, amoeba and the heart and brain. In the case of living biological tissue, the spatiotemporal patterns formed by these excitation waves are different in healthy and diseased states(2,3). Current electrical and pharmacological methods for wave modulation lack the spatiotemporal precision needed to control these patterns. Optical methods have the potential to overcome these limitations, but to date have only been demonstrated in simple systems, such as the Belousov-Zhabotinsky chemical reaction(4)...
December 2015: Nature Photonics
Giulia Grancini, Ajay Ram Srimath Kandada, Jarvist M Frost, Alex J Barker, Michele De Bastiani, Marina Gandini, Sergio Marras, Guglielmo Lanzani, Aron Walsh, Annamaria Petrozza
Solar cells based on hybrid inorganic-organic halide perovskites have demonstrated high power conversion efficiencies in a range of architectures. The existence and stability of bound electron-hole pairs in these materials, and their role in the exceptional performance of optoelectronic devices, remains a controversial issue. Here we demonstrate, through a combination of optical spectroscopy and multiscale modeling as a function of the degree of polycrystallinity and temperature, that the electron-hole interaction is sensitive to the microstructure of the material...
October 1, 2015: Nature Photonics
Matjaž Humar, Seok Hyun Yun
Optical microresonators(1) which confine light within a small cavity are widely exploited for various applications ranging from the realization of lasers(2) and nonlinear devices(3, 4, 5) to biochemical and optomechanical sensing(6, 7, 8, 9, 10, 11). Here we employ microresonators and suitable optical gain materials inside biological cells to demonstrate various optical functions in vitro including lasing. We explored two distinct types of microresonators: soft and hard, that support whispering-gallery modes (WGM)...
September 1, 2015: Nature Photonics
Sergei K Turitsyn, Anastasia E Bednyakova, Mikhail P Fedoruk, Serguei B Papernyi, Wallace R L Clements
An important group of nonlinear processes in optical fibre involves the mixing of four waves due to the intensity dependence of the refractive index. It is customary to distinguish between nonlinear effects that require external/pumping waves (cross-phase modulation and parametric processes such as four-wave mixing) and self-action of the propagating optical field (self-phase modulation and modulation instability). Here, we present a new nonlinear self-action effect, self-parametric amplification (SPA), which manifests itself as optical spectrum narrowing in normal dispersion fibre, leading to very stable propagation with a distinctive spectral distribution...
September 1, 2015: Nature Photonics
Sergii Yakunin, Mykhailo Sytnyk, Dominik Kriegner, Shreetu Shrestha, Moses Richter, Gebhard J Matt, Hamed Azimi, Christoph J Brabec, Julian Stangl, Maksym V Kovalenko, Wolfgang Heiss
The evolution of real-time medical diagnostic tools such as angiography and computer tomography from radiography based on photographic plates was enabled by the development of integrated solid-state X-ray photon detectors, based on conventional solid-state semiconductors. Recently, for optoelectronic devices operating in the visible and near infrared spectral regions, solution-processed organic and inorganic semiconductors have also attracted immense attention. Here we demonstrate a possibility to use such inexpensive semiconductors for sensitive detection of X-ray photons by direct photon-to-current conversion...
July 2015: Nature Photonics
Puxiang Lai, Lidai Wang, Jian Wei Tay, Lihong V Wang
Non-invasively focusing light into strongly scattering media, such as biological tissue, is highly desirable but challenging. Recently, ultrasonically guided wavefront shaping technologies have been developed to address this limitation. So far, the focusing resolution of most implementations has been limited by acoustic diffraction. Here, we introduce nonlinear photoacoustically guided wavefront shaping (PAWS), which achieves optical diffraction-limited focusing in scattering media. We develop an efficient dual-pulse excitation approach to generate strong nonlinear photoacoustic (PA) signals based on the Grueneisen relaxation effect...
February 2015: Nature Photonics
Matthew B Bouchard, Venkatakaushik Voleti, César S Mendes, Clay Lacefield, Wesley B Grueber, Richard S Mann, Randy M Bruno, Elizabeth M C Hillman
We report a new 3D microscopy technique that allows volumetric imaging of living samples at ultra-high speeds: Swept, confocally-aligned planar excitation (SCAPE) microscopy. While confocal and two-photon microscopy have revolutionized biomedical research, current implementations are costly, complex and limited in their ability to image 3D volumes at high speeds. Light-sheet microscopy techniques using two-objective, orthogonal illumination and detection require a highly constrained sample geometry, and either physical sample translation or complex synchronization of illumination and detection planes...
February 2015: Nature Photonics
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