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ACS Photonics

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https://www.readbyqxmd.com/read/29780853/terahertz-magnon-polaritons-in-tmfeo-3
#1
Kirill Grishunin, Thomas Huisman, Guanqiao Li, Elena Mishina, Theo Rasing, Alexey V Kimel, Kailing Zhang, Zuanming Jin, Shixun Cao, Wei Ren, Guo-Hong Ma, Rostislav V Mikhaylovskiy
Magnon-polaritons are shown to play a dominant role in the propagation of terahertz (THz) waves through TmFeO3 orthoferrite, if the frequencies of the waves are in the vicinity of the quasi-antiferromagnetic spin resonance mode. Both time-domain THz transmission and emission spectroscopies reveal clear beatings between two modes with frequencies slightly above and slightly below this resonance, respectively. Rigorous modeling of the interaction between the spins of TmFeO3 and the THz light shows that the frequencies correspond to the upper and lower magnon-polariton branches...
April 18, 2018: ACS Photonics
https://www.readbyqxmd.com/read/29607350/how-dark-are-radial-breathing-modes-in-plasmonic-nanodisks
#2
Franz-Philipp Schmidt, Arthur Losquin, Ferdinand Hofer, Andreas Hohenau, Joachim R Krenn, Mathieu Kociak
Due to a vanishing dipole moment, radial breathing modes in small flat plasmonic nanoparticles do not couple to light and have to be probed with a near-field source, as in electron energy loss spectroscopy (EELS). With increasing particle size, retardation gives rise to light coupling, enabling probing breathing modes optically or by cathodoluminescence (CL). Here, we investigate single silver nanodisks with diameters of 150-500 nm by EELS and CL in an electron microscope and quantify the EELS/CL ratio, which corresponds to the ratio of full to radiative damping of the breathing mode...
March 21, 2018: ACS Photonics
https://www.readbyqxmd.com/read/29594186/antimatched-electromagnetic-metasurfaces-for-broadband-arbitrary-phase-manipulation-in-reflection
#3
Odysseas Tsilipakos, Thomas Koschny, Costas M Soukoulis
Metasurfaces impart phase discontinuities on impinging electromagnetic waves that are typically limited to 0-2π. Here, we demonstrate that multiresonant metasurfaces can break free from this limitation and supply arbitrarily large, tunable time delays over ultrawide bandwidths. As such, ultrathin metasurfaces can act as the equivalent of thick bulk structures by emulating the multiple geometric resonances of three-dimensional systems that originate from phase accumulation with effective material resonances implemented on the surface itself via suitable subwavelength meta-atoms...
March 21, 2018: ACS Photonics
https://www.readbyqxmd.com/read/29594185/ab-initio-optimized-effective-potentials-for-real-molecules-in-optical-cavities-photon-contributions-to-the-molecular-ground-state
#4
Johannes Flick, Christian Schäfer, Michael Ruggenthaler, Heiko Appel, Angel Rubio
We introduce a simple scheme to efficiently compute photon exchange-correlation contributions due to the coupling to transversal photons as formulated in the newly developed quantum-electrodynamical density-functional theory (QEDFT).1-5 Our construction employs the optimized-effective potential (OEP) approach by means of the Sternheimer equation to avoid the explicit calculation of unoccupied states. We demonstrate the efficiency of the scheme by applying it to an exactly solvable GaAs quantum ring model system, a single azulene molecule, and chains of sodium dimers, all located in optical cavities and described in full real space...
March 21, 2018: ACS Photonics
https://www.readbyqxmd.com/read/29805987/analyses-of-intravesicular-exosomal-proteins-using-a-nano-plasmonic-system
#5
Jongmin Park, Hyungsoon Im, Seonki Hong, Cesar M Castro, Ralph Weissleder, Hakho Lee
Extracellular vesicles (EVs), including exosomes, are nanoscale membrane particles shed from cells and contain cellular proteins whose makeup could inform cancer diagnosis and treatment. Most analyses have focused on surface proteins while analysis of intravesicular proteins has been more challenging. Herein, we report an EV screening assay for both intravesicular and transmembrane proteins using a nanoplasmonic sensor. Termed iNPS (intravesicular nanoplasmonic system), this platform used nanohole-based surface plasmon resonance (SPR) for molecular detection...
February 21, 2018: ACS Photonics
https://www.readbyqxmd.com/read/29541653/near-infrared-and-optical-beam-steering-and-frequency-splitting-in-air-holes-in-silicon-inverse-photonic-crystals
#6
Anna C Tasolamprou, Thomas Koschny, Maria Kafesaki, Costas M Soukoulis
We present the design of a dielectric inverse photonic crystal structure that couples line-defect waveguide propagating modes into highly directional beams of controllable directionality. The structure utilizes a triangular lattice made of air holes drilled in an infinitely thick Si slab, and it is designed for operation in the near-infrared and optical regime. The structure operation is based on the excitation and manipulation of dark dielectric surface states, in particular on the tailoring of the dark states' coupling to outgoing radiation...
November 15, 2017: ACS Photonics
https://www.readbyqxmd.com/read/29250573/single-photon-quantum-contextuality-on-a-chip
#7
Andrea Crespi, Marco Bentivegna, Ioannis Pitsios, Davide Rusca, Davide Poderini, Gonzalo Carvacho, Vincenzo D'Ambrosio, Adán Cabello, Fabio Sciarrino, Roberto Osellame
In classical physics, properties of objects exist independently of the context, i.e., whether and how measurements are performed. Quantum physics showed this assumption to be wrong, and that Nature is indeed "contextual". Contextuality has been observed in the simplest physical systems, such as single particles, and plays fundamental roles in quantum computation advantage. Here, we demonstrate for the first time quantum contextuality in an integrated photonic chip. The chip implements different combinations of measurements on a single photon delocalized on four distinct spatial modes, showing violations of a Clauser-Horne-Shimony-Holt (CHSH)-like noncontextuality inequality...
November 15, 2017: ACS Photonics
https://www.readbyqxmd.com/read/29057294/integrating-quantum-dots-and-dielectric-mie-resonators-a-hierarchical-metamaterial-inheriting-the-best-of-both
#8
Antonio Capretti, Arnon Lesage, Tom Gregorkiewicz
Nanoscale dielectric resonators and quantum-confined semiconductors have enabled unprecedented control over light absorption and excited charges, respectively. In this work, we embed luminescent silicon nanocrystals (Si-NCs) into a 2D array of SiO2 nanocylinders and experimentally prove a powerful concept: the resulting metamaterial preserves the radiative properties of the Si-NCs and inherits the spectrally selective absorption properties of the nanocylinders. This hierarchical approach provides increased photoluminescence (PL) intensity obtained without utilizing any lossy plasmonic components...
September 20, 2017: ACS Photonics
https://www.readbyqxmd.com/read/28966933/visual-understanding-of-light-absorption-and-waveguiding-in-standing-nanowires-with-3d-fluorescence-confocal-microscopy
#9
Rune Frederiksen, Gozde Tutuncuoglu, Federico Matteini, Karen L Martinez, Anna Fontcuberta I Morral, Esther Alarcon-Llado
Semiconductor nanowires are promising building blocks for next-generation photonics. Indirect proofs of large absorption cross sections have been reported in nanostructures with subwavelength diameters, an effect that is even more prominent in vertically standing nanowires. In this work we provide a three-dimensional map of the light around vertical GaAs nanowires standing on a substrate by using fluorescence confocal microscopy, where the strong long-range disruption of the light path along the nanowire is illustrated...
September 20, 2017: ACS Photonics
https://www.readbyqxmd.com/read/28824931/core-shell-plasmonic-nanohelices
#10
Dolfine Kosters, Anouk de Hoogh, Hans Zeijlemaker, Hakkı Acar, Nir Rotenberg, L Kuipers
We introduce core-shell plasmonic nanohelices, highly tunable structures that have a different response in the visible for circularly polarized light of opposite handedness. The glass core of the helices is fabricated using electron beam induced deposition and the pure gold shell is subsequently sputter coated. Optical measurements allow us to explore the chiral nature of the nanohelices, where differences in the response to circularly polarized light of opposite handedness result in a dissymmetry factor of 0...
July 19, 2017: ACS Photonics
https://www.readbyqxmd.com/read/28868327/near-field-optical-drilling-of-sub-%C3%AE-pits-in-thin-polymer-films
#11
Tao Ding, Rohit Chikkaraddy, Jan Mertens, Jeremy J Baumberg
Under UV illumination, polymer films can undergo chain scission and contract. Using this effect, tightly focused laser light is shown to develop runaway near-field concentration that drills sub-100 nm pits through a thin film. This subwavelength photolithography can be controlled in real time by monitoring laser scatter from the evolving holes, allowing systematic control of the void diameter. Our model shows how interference between the substrate and film together with near-field focusing by the evolving crevice directs this formation and predicts minimum pit sizes in films of 100 nm thickness on gold substrates...
June 21, 2017: ACS Photonics
https://www.readbyqxmd.com/read/28781983/high-photocurrent-in-gated-graphene-silicon-hybrid-photodiodes
#12
Sarah Riazimehr, Satender Kataria, Rainer Bornemann, Peter Haring Bolívar, Francisco Javier Garcia Ruiz, Olof Engström, Andres Godoy, Max C Lemme
Graphene/silicon (G/Si) heterojunction based devices have been demonstrated as high responsivity photodetectors that are potentially compatible with semiconductor technology. Such G/Si Schottky junction diodes are typically in parallel with gated G/silicon dioxide (SiO2)/Si areas, where the graphene is contacted. Here, we utilize scanning photocurrent measurements to investigate the spatial distribution and explain the physical origin of photocurrent generation in these devices. We observe distinctly higher photocurrents underneath the isolating region of graphene on SiO2 adjacent to the Schottky junction of G/Si...
June 21, 2017: ACS Photonics
https://www.readbyqxmd.com/read/28670601/light-directed-tuning-of-plasmon-resonances-via-plasmon-induced-polymerization-using-hot-electrons
#13
Tao Ding, Jan Mertens, Anna Lombardi, Oren A Scherman, Jeremy J Baumberg
The precise morphology of nanoscale gaps between noble-metal nanostructures controls their resonant wavelengths. Here we show photocatalytic plasmon-induced polymerization can locally enlarge the gap size and tune the plasmon resonances. We demonstrate light-directed programmable tuning of plasmons can be self-limiting. Selective control of polymer growth around individual plasmonic nanoparticles is achieved, with simultaneous real-time monitoring of the polymerization process in situ using dark-field spectroscopy...
June 21, 2017: ACS Photonics
https://www.readbyqxmd.com/read/28670600/single-quantum-dot-with-microlens-and-3d-printed-micro-objective-as-integrated-bright-single-photon-source
#14
Sarah Fischbach, Alexander Schlehahn, Alexander Thoma, Nicole Srocka, Timo Gissibl, Simon Ristok, Simon Thiele, Arsenty Kaganskiy, André Strittmatter, Tobias Heindel, Sven Rodt, Alois Herkommer, Harald Giessen, Stephan Reitzenstein
Integrated single-photon sources with high photon-extraction efficiency are key building blocks for applications in the field of quantum communications. We report on a bright single-photon source realized by on-chip integration of a deterministic quantum dot microlens with a 3D-printed multilens micro-objective. The device concept benefits from a sophisticated combination of in situ 3D electron-beam lithography to realize the quantum dot microlens and 3D femtosecond direct laser writing for creation of the micro-objective...
June 21, 2017: ACS Photonics
https://www.readbyqxmd.com/read/29354665/hot-carrier-generation-and-extraction-of-plasmonic-alloy-nanoparticles
#15
Marco Valenti, Anirudh Venugopal, Daniel Tordera, Magnus P Jonsson, George Biskos, Andreas Schmidt-Ott, Wilson A Smith
The conversion of light to electrical and chemical energy has the potential to provide meaningful advances to many aspects of daily life, including the production of energy, water purification, and optical sensing. Recently, plasmonic nanoparticles (PNPs) have been increasingly used in artificial photosynthesis (e.g., water splitting) devices in order to extend the visible light utilization of semiconductors to light energies below their band gap. These nanoparticles absorb light and produce hot electrons and holes that can drive artificial photosynthesis reactions...
May 17, 2017: ACS Photonics
https://www.readbyqxmd.com/read/28540324/watt-level-continuous-wave-emission-from-a-bifunctional-quantum-cascade-laser-detector
#16
Benedikt Schwarz, Christine A Wang, Leo Missaggia, Tobias S Mansuripur, Paul Chevalier, Michael K Connors, Daniel McNulty, Jeffrey Cederberg, Gottfried Strasser, Federico Capasso
Bifunctional active regions, capable of light generation and detection at the same wavelength, allow a straightforward realization of the integrated mid-infrared photonics for sensing applications. Here, we present a high performance bifunctional device for 8 μm capable of 1 W single facet continuous wave emission at 15 °C. Apart from the general performance benefits, this enables sensing techniques which rely on continuous wave operation, for example, heterodyne detection, to be realized within a monolithic platform and demonstrates that bifunctional operation can be realized at longer wavelength, where wavelength matching becomes increasingly difficult and that the price to be paid in terms of performance is negligible...
May 17, 2017: ACS Photonics
https://www.readbyqxmd.com/read/29354664/single-photon-nanoantennas
#17
REVIEW
A Femius Koenderink
Single-photon nanoantennas are broadband strongly scattering nanostructures placed in the near field of a single quantum emitter, with the goal to enhance the coupling between the emitter and far-field radiation channels. Recently, great strides have been made in the use of nanoantennas to realize fluorescence brightness enhancements, and Purcell enhancements, of several orders of magnitude. This perspective reviews the key figures of merit by which single-photon nanoantenna performance is quantified and the recent advances in measuring these metrics unambiguously...
April 19, 2017: ACS Photonics
https://www.readbyqxmd.com/read/28470028/high-power-growth-robust-ingaas-inalas-terahertz-quantum-cascade-lasers
#18
Christoph Deutsch, Martin Alexander Kainz, Michael Krall, Martin Brandstetter, Dominic Bachmann, Sebastian Schönhuber, Hermann Detz, Tobias Zederbauer, Donald MacFarland, Aaron Maxwell Andrews, Werner Schrenk, Mattias Beck, Keita Ohtani, Jérôme Faist, Gottfried Strasser, Karl Unterrainer
We report on high-power terahertz quantum cascade lasers based on low effective electron mass InGaAs/InAlAs semiconductor heterostructures with excellent reproducibility. Growth-related asymmetries in the form of interface roughness and dopant migration play a crucial role in this material system. These bias polarity dependent phenomena are studied using a nominally symmetric active region resulting in a preferential electron transport in the growth direction. A structure based on a three-well optical phonon depletion scheme was optimized for this bias direction...
April 19, 2017: ACS Photonics
https://www.readbyqxmd.com/read/28470027/the-origin-and-limit-of-asymmetric-transmission-in-chiral-resonators
#19
Nikhil Parappurath, Filippo Alpeggiani, L Kuipers, Ewold Verhagen
We observe that the asymmetric transmission (AT) through photonic systems with a resonant chiral response is strongly related to the far-field properties of eigenmodes of the system. This understanding can be used to predict the AT for any resonant system from its complex eigenmodes. We find that the resonant chiral phenomenon of AT is related to, and is bounded by, the nonresonant scattering properties of the system. Using the principle of reciprocity, we determine a fundamental limit to the maximum AT possible for a single mode in any chiral resonator...
April 19, 2017: ACS Photonics
https://www.readbyqxmd.com/read/28523285/electrically-pumped-wavelength-tunable-gaas-quantum-dots-interfaced-with-rubidium-atoms
#20
Huiying Huang, Rinaldo Trotta, Yongheng Huo, Thomas Lettner, Johannes S Wildmann, Javier Martín-Sánchez, Daniel Huber, Marcus Reindl, Jiaxiang Zhang, Eugenio Zallo, Oliver G Schmidt, Armando Rastelli
We demonstrate the first wavelength-tunable electrically pumped source of nonclassical light that can emit photons with wavelength in resonance with the D2 transitions of (87)Rb atoms. The device is fabricated by integrating a novel GaAs single-quantum-dot light-emitting diode (LED) onto a piezoelectric actuator. By feeding the emitted photons into a 75 mm long cell containing warm (87)Rb vapor, we observe slow-light with a temporal delay of up to 3.4 ns. In view of the possibility of using (87)Rb atomic vapors as quantum memories, this work makes an important step toward the realization of hybrid-quantum systems for future quantum networks...
March 15, 2017: ACS Photonics
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