Now showing items 887-906 of 962

    • Turbulence-free interference induced by the turbulence itself 

      Smith, Thomas A.; Shih, Yanhua (AIP Publishing, 2020-12-11)
      When a laser beam is incident on a double-slit interferometer without turbulence, the classic Young’s double-slit interference is present in the first-order measurement of the mean photon number (or intensity), while the ...
    • Turbulence-free two-photon double-slit interference with coherent and incoherent light 

      Smith, Thomas A.; Shih, Yanhua (Optical Society of America, 2019-11-11)
      This article reports a study on a turbulence-free Young’s double-slit interferometer. When the environmental turbulence blurs out the classic Young’s double-slit interference completely, a two-photon interference pattern ...
    • Two-atom interferometer 

      Locke, M. F.; Shih, Y. H. (American Physiological Society (APS), 2021-03-18)
      This Letter presents a nonclassical mechanism of two-atom interferometry. The two-atom interferometer introduces two different yet indistinguishable alternatives for randomly paired atoms to create a joint atom-detection ...
    • Two-photon X-ray Ghost Microscope 

      Smith, Thomas A.; Wang, Zhehui; Shih, Yanhua (2020-02-05)
      Unlike classic imaging devices in the visible spectrum, there are no effective imaging lenses to produce the point-to-point image-forming function for high-energy (short-wavelength) X rays. The X-ray imaging that we are ...
    • Two-year comparison of radiances from the Atmospheric Infrared Sounder (AIRS) and the Infrared Atmospheric Sounding Interferometer (IASI) 

      Elliott, Denis A.; Aumann, Hartmut H.; Strow, L. Larrabee; Hannon, Scott E. (Society of Photo-Optical Instrumentation Engineers (SPIE), 2009-08-12)
      The radiometric intercomparison of instruments is a key element in developing climate-quality data records. In this study we compare data from the first two years of the Infrared Atmospheric Sounding Interferometer (IASI) ...
    • Ultrafast Carrier Dynamics of Monolayer WS2 via Broad-Band Time-Resolved Terahertz Spectroscopy 

      Gustafson, Jon K.; Cunningham, Paul D.; McCreary, Kathleen M.; Jonker, Berend T.; Hayden, L. Michael (American Chemical Society, 2019-11-19)
      We report on the ultrafast carrier dynamics of monolayer WS2 using broad-band time-resolved terahertz spectroscopy (TRTS). We find that upon photoexcitation, there is an increase in the conductivity. We attribute this ...
    • Ultralow-power nonlinear optics using tapered optical fibers in metastable xenon 

      Pittman, T.B.; Jones, D.E; Franson, J.D. (American Physical Society (APS), 2013-11-06)
      We demonstrate nanowatt-level saturated absorption using a subwavelength diameter tapered optical fiber (TOF) suspended in a gas of metastable xenon atoms. This ultralow-power nonlinearity is enabled by a small optical ...
    • Ultralow-power nonlinear optics using tapered optical fibers in noble gases 

      Pittman, T.B.; Jones, D.E; Franson, J.D. (OSA Publishing, 2014)
      We demonstrate ultralow-power optical nonlinearities using a sub-wavelength diameter tapered optical fiber in a gas of metastable xenon atoms. The use of inert noble gases offers advantages over reactive alkali vapors such ...
    • Ultrastrong coupling of polar phonons and effective epsilon-near-zero modes in coaxial nanocavities 

      Yoo, Daehan; Leon-Perez, Fernando de; Lee, In-Ho; Mohr, Daniel A.; Pelton, Matthew; Raschke, Markus B.; Caldwell, Joshua D.; Martın-Moreno, Luis; Oh, Sang-Hyun (2020-02-29)
      Ultrastrong coupling (USC), where the light-matter coupling strength is comparable to the resonance frequency of the uncoupled bare system, presents new frontiers in nanophotonics. However, it has remained notoriously ...
    • Ultrastrong plasmon-phonon coupling via epsilon-near-zero nanocavities 

      Yoo, Daehan; León-Pérez, Fernando de; Pelton, Matthew; Lee, In-Ho; Mohr, Daniel A.; Raschke, Markus B.; Caldwell, Joshua D.; Martín-Moreno, Luis; Oh, Sang-Hyun (Springer Nature, 2020-12-07)
      Vibrational ultrastrong coupling, where the light–matter coupling strength is comparable to the vibrational frequency of molecules, presents new opportunities to probe the interactions between molecules and zero-point ...
    • Unidentified Gamma-ray Sources as Targets for Indirect Dark Matter Detection with the Fermi-Large Area Telescope 

      Coronado-Blázquez, Javier; Sánchez-Conde, Miguel A.; Domínguez, Alberto; Aguirre-Santaella, Alejandra; Di Mauro, Mattia; Mirabald, Néstor; Nieto, Daniel; Charles, Eric (2019-06)
      One of the predictions of the ΛCDM cosmological framework is the hierarchical formation of structure, giving rise to dark matter (DM) halos and subhalos. When the latter are massive enough they retain gas (i.e., baryons) ...
    • The Unique, Optically-Dominated Quasar Jet of PKS 1421-490 

      Gelbord, J.M.; Marshall, H.L.; Worrall, D.M.; Birkinshaw, M.; Lovell, J.E.J.; Ojha, R.; Godfrey, L.; Jauncey, D.L.; Schwartz, D.A.; Perlman, E.S.; Georganopoulos, M.; Murphy, D.W. (MIT School of Science, 2005-01-10)
    • A Universal Scaling for the Energetics of Relativistic Jets from Black Hole Systems 

      Nemmen, R. S.; Georganopoulos, M.; Guiriec, S.; Meyer, E. T.; Gehrels, N.; Sambruna, R. M. (American Association for the Advancement of Science (AAAS), 2012-12-14)
      Black holes generate collimated, relativistic jets, which have been observed in gamma-ray bursts (GRBs), microquasars, and at the center of some galaxies [active galactic nuclei (AGN)]. How jet physics scales from stellar ...
    • Unusual flaring activity in the blazar PKS 1424−418 during 2008−2011 

      Buson, S.; Longo, F.; Larsson, S.; Cutini, S.; Finke, J.; Ciprini, S.; Ojha, R.; D'Ammando, F.; Donato, D.; Thompson, D. J.; Desiante, R.; Bastieri, D.; Wagner, S.; Hauser, M.; Fuhrmann, L.; Dutka, M.; Müller, C.; Kadler, M.; Angelakis, E.; Zensus, J. A.; Stevens, J.; Blanchard, J. M.; Edwards, P. G.; Lovell, J. E. J.; Gurwell, M. A.; Wehrle, A. E.; Zook, A. (EDP sciences, 2014-09-16)
      Context. Blazars are a subset of active galactic nuclei (AGN) with jets that are oriented along our line of sight. Variability and spectral energy distribution (SED) studies are crucial tools for understanding the physical ...
    • The unusual multiwavelength properties of the gamma-ray source PMN J1603−4904 

      Müller, Cornelia; Kadler, M.; Ojha, R.; Böck, M.; Krauß, F.; Taylor, G. B.; Wilms, J.; Blanchard, J.; Carpenter, B.; Dauser, T.; Dutka, M.; Edwards, P. G.; Gehrels, N.; Grossberger, C.; Hase, H.; Horiuchi, S.; Kreikenbohm, A.; Lovell, J. E. J.; McConville, W.; Phillips, C.; Plötz, C.; Pursimo, T.; Quick, J.; Ros, E.; Schulz, R.; Stevens, J.; Tingay, S. J.; Trüstedt, J.; Tzioumis, A. K.; Zensus, J. A. (EDP sciences, 2014-01-30)
      Context. We investigate the nature and classification of PMN J1603−4904, a bright radio source close to the Galactic plane, which is associated with one of the brightest hard-spectrum γ-ray sources detected by Fermi/LAT. ...
    • An update on MASIV: How intrinsic properties influence interstellar scintillation of AGN 

      Bignall, Hayley; Koay, Jun Yi; Lovell, Jim; Jauncey, Dave; Macquart, Jean-Pierre; Pursimo, Tapio; Ojha, Roopesh; Rickett, Barney; Kedziora-Chudczer, Lucyna; Reynolds, Cormac; Khoo, Sue (Proceedings of Science, 2012-04-17)
      Many flat-spectrum AGN exhibit short timescale variations when observed at radio wavelengths, due to interstellar scintillation (ISS). The observed variations depend on source angular size and "core dominance", as well as ...
    • Update on the Activities of the GGOS Bureau of Networks and Observations 

      Pearlman, Michael R.; Pavlis, Erricos C.; Ma, Chopo; Noll, Carey; Thaller, Daniela; Richter, Bernd; Gross, Richard; Neilan, Ruth; Mueller, Juergen; Barzaghi, Ricardo; Bergstrand, Sten; Saunier, Jerome; Tamisiea, Mark (National Aeronautics and Space Administration, 2016)
      The recently reorganized GGOS Bureau of Networks and Observations has many elements that are associated with building and sustaining the infrastructure that supports the Global Geodetic Observing System (GGOS) through the ...
    • Upstream Ultra‐Low Frequency Waves Observed by MESSENGER's Magnetometer: Implications for Particle Acceleration at Mercury's Bow Shock 

      Romanelli, N.; DiBraccio, G.; Gershman, D.; Le, G.; Mazelle, C.; Meziane, K.; Boardsen, S.; Slavin, J.; Raines, J.; Glass, A.; Espley, J. (American Geophysical Union, 2020-04-09)
      We perform the first statistical analysis of the main properties of waves observed in the 0.05–0.41 Hz frequency range in the Hermean foreshock by the MErcury Surface, Space ENvironment, GEochemistry, and Ranging (MESSENGER) ...
    • Using Clickers for Deliberate Practice in Five Large Science Courses 

      Hodges, Linda C.; Anderson, Eric C.; Carpenter, Tara S.; Cui, Lili; Feeser, Elizabeth A.; Gierasch, Tiffany Malinky (NSTA, 2017-11-01)
      Clickers are often used as an active learning tool in face-to-face classes to enhance student engagement and assess student learning. In this article we share the variety of ways that we use clicker questions ...