411 results found
Abdelwahab I, Grinblat G, Leng K, et al., 2018, Highly Enhanced Third-Harmonic Generation in 2D Perovskites at Excitonic Resonances, ACS NANO, Vol: 12, Pages: 644-650, ISSN: 1936-0851
Bobrovska N, Matuszewski M, Daskalakis KS, et al., 2018, Dynamical Instability of a Nonequilibrium Exciton-Polariton Condensate, ACS PHOTONICS, Vol: 5, Pages: 111-118, ISSN: 2330-4022
Brown LV, Davanco M, Sun Z, et al., 2018, Nanoscale Mapping and Spectroscopy of Nonradiative Hyperbolic Modes in Hexagonal Boron Nitride Nanostructures., Nano Lett
The inherent crystal anisotropy of hexagonal boron nitride (hBN) provides the ability to support hyperbolic phonon polaritons, that is, polaritons that can propagate with very large wave vectors within the material volume, thereby enabling optical confinement to exceedingly small dimensions. Indeed, previous research has shown that nanometer-scale truncated nanocone hBN cavities, with deep subdiffractional dimensions, support three-dimensionally confined optical modes in the mid-infrared. Because of optical selection rules, only a few of the many theoretically predicted modes have been observed experimentally via far-field reflection and scattering-type scanning near-field optical microscopy (s-SNOM). The photothermal induced resonance (PTIR) technique probes optical and vibrational resonances overcoming weak far-field emission by leveraging an atomic force microscope (AFM) probe to transduce local sample expansion caused by light absorption. Here we show that PTIR enables the direct observation of previously unobserved, dark hyperbolic modes of hBN nanostructures. Leveraging these optical modes and their wide range of angular and radial momenta could provide a new degree of control over the electromagnetic near-field concentration, polarization in nanophotonic applications.
Chen J, Zhao X, Grinblat G, et al., 2018, Homoepitaxial Growth of Large-Scale Highly Organized Transition Metal Dichalcogenide Patterns, ADVANCED MATERIALS, Vol: 30, ISSN: 0935-9648
Hasan M, Khunsin W, Mavrokefalos CK, et al., 2018, Facile Electrochemical Synthesis of Pd Nanoparticles with Enhanced Electrocatalytic Properties from Surfactant-Free Electrolyte, CHEMELECTROCHEM, Vol: 5, Pages: 619-629, ISSN: 2196-0216
Hu H, Zhang J, Maier SA, et al., 2018, Enhancing Third-Harmonic Generation with Spatial Nonlocality, ACS PHOTONICS, Vol: 5, Pages: 592-598, ISSN: 2330-4022
Mignuzzi S, Mota M, Coenen T, et al., 2018, Energy-momentum cathodoluminescence spectroscopy of dielectric nanostructures, ACS Photonics, ISSN: 2330-4022
Shibanuma T, Maier SA, Albella P, 2018, Polarization control of high transmission/reflection switching by all-dielectric metasurfaces, APPLIED PHYSICS LETTERS, Vol: 112, ISSN: 0003-6951
Simoncelli S, Li Y, Cortés E, et al., 2018, Nanoscale Control of Molecular Self-Assembly Induced by Plasmonic Hot-Electron Dynamics., ACS Nano
Self-assembly processes allow designing and creating complex nanostructures using molecules as building blocks and surfaces as scaffolds. This autonomous driven construction is possible due to a complex thermodynamic balance of molecule-surface interactions. As such, nanoscale guidance and control over this process is hard to achieve. Here we use the highly localized light-to-chemical-energy conversion of plasmonic materials to spatially cleave Au-S bonds on predetermined locations within a single nanoparticle, enabling a high degree of control over this archetypal system for molecular self-assembly. Our method offers nanoscale precision and high-throughput light-induced tailoring of the surface chemistry of individual and packed nanosized metallic structures by simply varying wavelength and polarization of the incident light. Assisted by single-molecule super-resolution fluorescence microscopy, we image, quantify, and shed light onto the plasmon-induced desorption mechanism. Our results point toward localized distribution of hot electrons, contrary to uniformly distributed lattice heating, as the mechanism inducing Au-S bond breaking. We demonstrate that plasmon-induced photodesorption enables subdiffraction and even subparticle multiplexing. Finally, we explore possible routes to further exploit these concepts for the selective positioning of nanomaterials and the sorting and purification of colloidal nanoparticles.
Wang Z, Dong Z, Zhu H, et al., 2018, Selectively Plasmon-Enhanced Second-Harmonic Generation from Monolayer Tungsten Diselenide on Flexible Substrates., ACS Nano, Vol: 12, Pages: 1859-1867
Monolayer two-dimensional transition-metal dichalcogenides (2D TMDCs) exhibit promising characteristics in miniaturized nonlinear optical frequency converters, due to their inversion asymmetry and large second-order nonlinear susceptibility. However, these materials usually have very short light interaction lengths with the pump laser because they are atomically thin, such that second-harmonic generation (SHG) is generally inefficient. In this paper, we fabricate a judiciously structured 150 nm-thick planar surface consisting of monolayer tungsten diselenide and sub-20 nm-wide gold trenches on flexible substrates, reporting ∼7000-fold SHG enhancement without peak broadening or background in the spectra as compared to WSe2on as-grown sapphire substrates. Our proof-of-concept experiment yields effective second-order nonlinear susceptibility of 2.1 × 104pm/V. Three orders of magnitude enhancement is maintained with pump wavelength ranging from 800 to 900 nm, breaking the limitation of narrow pump wavelength range for cavity-enhanced SHG. In addition, SHG amplitude can be dynamically controlled via selective excitation of the lateral gap plasmon by rotating the laser polarization. Such a fully open, flat, and ultrathin profile enables a great variety of functional samples with high SHG from one patterned silicon substrate, favoring scalable production of nonlinear converters. The surface accessibility also enables integration with other optical components for information processing in an ultrathin and flexible form.
Androvitsaneas P, Young AB, Lennon JM, et al., 2017, Efficient deterministic giant photon phase shift from a single charged quantum dot
© OSA 2017. We demonstrate a deterministic shift in phase of an input single photon by a negatively charged quantum dot in a low Q-factor, high output efficiency micropillar cavity, with values up to 2π/3.
Black NCG, Liu CG, Pearce R, et al., 2017, Graphene gas sensing using a non-contact microwave method, NANOTECHNOLOGY, Vol: 28, ISSN: 0957-4484
Braic L, Vasilantonakis N, Mihai A, et al., 2017, Titanium Oxynitride Thin Films with Tunable Double Epsilon-Near-Zero Behavior for Nanophotonic Applications, ACS APPLIED MATERIALS & INTERFACES, Vol: 9, Pages: 29857-29862, ISSN: 1944-8244
Cambiasso J, Grinblat G, Li Y, et al., 2017, Bridging the Gap between Dielectric Nanophotonics and the Visible Regime with Effectively Lossless Gallium Phosphide Antennas, NANO LETTERS, Vol: 17, Pages: 1219-1225, ISSN: 1530-6984
Canet-Ferrer J, Albella P, Ribera A, et al., 2017, Hybrid magnetite-gold nanoparticles as bifunctional magnetic-plasmonic systems: three representative cases, NANOSCALE HORIZONS, Vol: 2, Pages: 205-216, ISSN: 2055-6756
Cortes, Xie W, Cambiasso, et al., 2017, Plasmonic hot electron transport drives nano-localized chemistry, Nature Communications, ISSN: 2041-1723
Nanoscale localization of electromagnetic fields near metallic nanostructures underpins the fundamentals and applications of plasmonics. The unavoidable energy loss from plasmon decay, initially seen as a detriment, has now expanded the scope of plasmonic applications to exploit the generated hot carriers. However, quantitative understanding of the spatial localization of these hot carriers, akin to electromagnetic near-field maps, has been elusive. Here we spatially map hot-electron-driven reduction chemistry with 15 nanometre resolution as a function of time and electromagnetic field polarization for different plasmonic nanostructures. We combine experiments employing a six-electron photo-recycling process that modify the terminal group of a self-assembled monolayer on plasmonic silver nanoantennas, with theoretical predictions from first-principles calculations of non-equilibrium hot-carrier transport in these systems. The resulting localization of reactive regions, determined by hot carrier transport from high-field regions, paves the way for improving efficiency in hot-carrier extraction science and nanoscale regio-selective surface chemistry.
Cortes E, Xie W, Cambiasso J, et al., 2017, Plasmonic hot electron transport drives nano-localized chemistry, NATURE COMMUNICATIONS, Vol: 8, ISSN: 2041-1723
Crick CR, Albella P, Kim H-J, et al., 2017, Low-Noise Plasmonic Nanopore Biosensors for Single Molecule Detection at Elevated Temperatures, ACS PHOTONICS, Vol: 4, Pages: 2835-2842, ISSN: 2330-4022
Dieleman F, Tame MS, Sonnefraud Y, et al., 2017, Experimental Verification of Entanglement Generated in a Plasmonic System, NANO LETTERS, Vol: 17, Pages: 7455-7461, ISSN: 1530-6984
Doiron B, Li Y, Mihai AP, et al., 2017, Comparison of the ultrafast hot electron dynamics of titanium nitride and gold for plasmonic applications, SPIE Optics + Photonics Conference on Plasmonics - Design, Materials, Fabrication, Characterization, and Applications XV, Publisher: SPIE-INT SOC OPTICAL ENGINEERING, ISSN: 0277-786X
Gargiulo J, Brick T, Violi IL, et al., 2017, Understanding and Reducing Photothermal Forces for the Fabrication of Au Nanoparticle Dimers by Optical Printing, NANO LETTERS, Vol: 17, Pages: 5747-5755, ISSN: 1530-6984
Grinblat G, Li Y, Nielsen MP, et al., 2017, Efficient Third Harmonic Generation and Nonlinear Subwavelength Imaging at a Higher-Order Anapole Mode in a Single Germanium Nanodisk, ACS NANO, Vol: 11, Pages: 953-960, ISSN: 1936-0851
Grinblat G, Li Y, Nielsen MP, et al., 2017, Degenerate Four-Wave Mixing in a Multiresonant Germanium Nanodisk, ACS PHOTONICS, Vol: 4, Pages: 2144-2149, ISSN: 2330-4022
Gubbin CR, Maier SA, De Liberato S, 2017, Theoretical investigation of phonon polaritons in SiC micropillar resonators, PHYSICAL REVIEW B, Vol: 95, ISSN: 2469-9950
Huidobro PA, Maier SA, Pendry JB, 2017, Tunable plasmonic metasurface for perfect absorption, EPJ APPLIED METAMATERIALS, Vol: 4, ISSN: 2272-2394
Lauri A, Velleman L, Xiao X, et al., 2017, 3D Confocal Raman Tomography to Probe Field Enhancements inside Supercluster Metamaterials, ACS PHOTONICS, Vol: 4, Pages: 2070-2077, ISSN: 2330-4022
Lerario G, Fieramosca A, Barachati F, et al., 2017, Room-temperature superfluidity in a polariton condensate, NATURE PHYSICS, Vol: 13, Pages: 837-+, ISSN: 1745-2473
Li K, Fitzgerald JM, Xiao X, et al., 2017, Graphene Plasmon Cavities Made with Silicon Carbide, ACS OMEGA, Vol: 2, Pages: 3640-3646, ISSN: 2470-1343
Ma Z, Hanham SM, Huidobro PA, et al., 2017, Terahertz particle-in-liquid sensing with spoof surface plasmon polariton waveguides, APL PHOTONICS, Vol: 2, ISSN: 2378-0967
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