Now showing items 5625-5644 of 18296

    • F-theory and N= 1 SCFTs in four dimensions 

      Morrison, David; Vafa, Cumrun (Springer Verlag, 2016)
    • F-theory and Neutrinos: Kaluza-Klein Dilution of Flavor Hierarchy 

      Bouchard, Vincent; Heckman, Jonathan; Seo, Jihye; Vafa, C. (Springer Verlag, 2010)
      We study minimal implementations of Majorana and Dirac neutrino scenarios in F-theory GUT models. In both cases the mass scale of the neutrinos \(m_{\nu} \sim M_{weak}^2/\land_{UV}\) arises from integrating out Kaluza-Klein ...
    • F-theory and the classification of little strings 

      Bhardwaj, Lakshya; Del Zotto, Michele; Heckman, Jonathan J.; Morrison, David R.; Rudelius, Tom; Vafa, Cumrun (American Physical Society, 2016)
      Little string theories (LSTs) are UV complete nonlocal six-dimensional (6D) theories decoupled from gravity in which there is an intrinsic string scale. In this paper, we present a systematic approach to the construction ...
    • F-theory, GUTs, and the Weak Scale 

      Heckman, Jonathan; Vafa, C. (Springer Verlag, 2009)
      In this paper we study a deformation of gauge mediated supersymmetry breaking in a class of local F-theory GUT models where the scale of supersymmetry breaking determines the value of the mu term. Geometrically correlating ...
    • F-Theory, spinning black holes and multi-string branches 

      Haghighat, Babak; Murthy, Sameer; Vafa, Cumrun; Vandoren, Stefan (Springer Verlag, 2016)
      We study 5d supersymmetric black holes which descend from strings of generic N = (1, 0) supergravity in 6d. These strings have an F-theory realization in 6d as D3 branes wrapping smooth genus g curves in the base of elliptic ...
    • Fabrication and Replication of Arrays of Single- or Multicomponent Nanostructures by Replica Molding and Mechanical Sectioning 

      Lipomi, Darren J.; Kats, Mikhail A; Kim, Philseok; Kang, Sung Hoon; Aizenberg, Joanna; Capasso, Federico; Whitesides, George McClelland (American Chemical Society (ACS), 2010)
      This paper describes the fabrication of arrays of nanostructures (rings, crescents, counterfacing split rings, cylinders, coaxial cylinders, and other structures) by a four-step process: (i) molding an array of epoxy posts ...
    • Fabrication and Sub-Band-Gap Absorption of Single-Crystal Si Supersaturated with Se by Pulsed Laser Mixing 

      Tabbal, Malek; Kim, Taegon; Woolf, David Nathaniel; Shin, Byungha; Aziz, Michael J. (Springer, 2010)
      Selenium supersaturated silicon layers were fabricated by pulsed excimer laser induced liquid-phase mixing of thin Se films on Si(001) wafers. Sufficiently low Se coverage avoids destabilization of rapid epitaxial ...
    • Fabrication methods for a quantum cascade photonic crystal surface emitting laser 

      Tennant, D. M.; Colombelli, R.; Srinivasan, K.; Troccoli, M.; Painter, O.; Gmachl, C.; Capasso, F.; Sergent, A. M.; Sivco, D. L.; Cho, A. Y. (American Vacuum Society, 2003)
      Conventional quantum cascade (QC) lasers are intrinsically edge-emitting devices with mode confinement achieved via a standard mesa stripe configuration. Surface emission in edge emitting QC lasers has therefore necessitated ...
    • Fabrication of Arrays of Metal and Metal Oxide Nanotubes by Shadow Evaporation 

      Dickey, Michael D.; Weiss, Emily A.; Smythe, Elizabeth J.; Chiechi, Ryan C.; Capasso, Federico; Whitesides, George M. (American Chemical Society, 2008-03-22)
    • Fabrication of Bioinspired Actuated Nanostructures with Arbitrary Geometry and Stiffness 

      Pokroy, Boaz; Epstein, Alexander K.; Persson-Gulda, Maria C. M.; Aizenberg, Joanna (Wiley-Blackwell, 2009)
      Bio-inspired, multifunctional, high-aspect-ratio nanostructured surfaces are fabricated in a variety of materials with controlled geometry and stiffness. A soft-lithography method that allows the one-to-one replication of ...
    • Fabrication of high-quality nanobeam photonic crystal cavities in 4H silicon carbide with embedded color centers 

      Bracher, David Olmstead; Hu, Evelyn (2016)
      A wide band-gap semiconductor with a long history of growth and device fabrication, silicon carbide (SiC) has attracted recent attention for hosting several defects with properties similar to the nitrogen vacancy center ...
    • Fabrication of Large-Area Patterned Nanostructures for Optical Applications by Nanoskiving 

      Xu, Qiaobing; Bao, Jiming; Rioux, Robert M.; Perez-Castillejos, Raquel; Capasso, Federico; Whitesides, George M. (American Chemical Society, 2007)
      Cost-effective and convenient methods for fabrication of patterned metallic nanostructures over the large (mm(2)) areas required for applications in photonics are much needed. In this paper, we demonstrate the fabrication ...
    • Fabrication of Low-Cost Paper-Based Microfluidic Devices by Embossing or Cut-and-Stack Methods 

      Thuo, Martin M.; Martinez, Ramses; Lan, Wen-Jie; Liu, Xinyu; Barber, Jabulani; Atkinson, Manza B. J.; Bandarage, Dineth; Bloch, Jean-Francis; Whitesides, George McClelland (American Chemical Society (ACS), 2014)
      This communication describes the use of embossing, and “cut-and-stack” methods of assembly, to generate microfluidic devices from omniphobic paper, and demonstrates that fluid flowing through these devices behaves similarly ...
    • Fabrication of Nonperiodic Metasurfaces by Microlens Projection Lithography 

      Gonidec, Mathieu; Hamedi, Mahiar M.; Nemiroski, Alex; Rubio, Luis M.; Torres, Cesar; Whitesides, George McClelland (American Chemical Society (ACS), 2016)
      This paper describes a strategy that uses template-directed self-assembly of µm-scale microspheres to fabricate arrays of microlenses for projection photolithography of periodic, quasiperiodic, and aperiodic infrared ...
    • Fabrication of Paper-Templated Structures of Noble Metals 

      Christodouleas, Dionysios C.; Simeone, Felice C.; Tayi, Alok Suryavamsee; Targ, Sonia; Weaver, James C.; Jayaram, Kaushik; Fernández-Abedul, Maria Teresa; Whitesides, George McClelland (Wiley-Blackwell, 2017)
      This manuscript describes a simple and rapid method for fabricating freestanding structures composed primarily (>94% w/w, and 55–80 at%) of noble metals (e.g., gold, silver, platinum, etc.) and having physical morphologies ...
    • Fabrication of Surface Plasmon Resonators by Nanoskiving Single-Crystalline Gold Microplates 

      Wiley, Benjamin J.; Lipomi, Darren J.; Bao, Jiming; Capasso, Federico; Whitesides, George M. (American Chemical Society, 2008)
      This paper demonstrates the sectioning of chemically synthesized, single-crystalline microplates of gold with an ultramicrotome (nanoskiving) to produce single-crystalline nanowires; these nanowires act as low-loss surface ...
    • Fabrication technologies for quantum cascade photonic-crystal microlasers 

      Colombelli, R.; Srinivasan, K.; Troccoli, M.; Painter, O.; Gmachl, C.; Tennant, D. M.; Sergent, A. M.; Sivco, D. L.; Cho, A. Y.; Capasso, Federico (IOP Publishing, 2004)
      In this paper we describe the technological and fabrication methods necessary to incorporate both photonic and electronic-band engineering in order to create novel surface-emitting quantum cascade microcavity laser sources. ...
    • Fabrication technologies for quantum cascade photonic-crystal microlasers 

      Colombelli, R.; Srinivasan, K.; Troccoli, M.; Painter, O.; Gmachl, C.; Tennant, D. M.; Sergent, A. M.; Sivco, D. L.; Cho, A. Y.; Capasso, Federico (IOP Publishing, 2004)
      In this paper we describe the technological and fabrication methods necessary to incorporate both photonic and electronic-band engineering in order to create novel surface-emitting quantum cascade microcavity laser sources. ...
    • Fabrication technologies for quantum cascade photonic-crystal microlasers 

      Colombelli, R.; Srinivasan, K.; Troccoli, M.; Painter, O.; Gmachl, C.; Tennant, D. M.; Sergent, A. M.; Sivco, D. L.; Cho, A. Y.; Capasso, Federico (IOP Publishing, 2004)
      In this paper we describe the technological and fabrication methods necessary to incorporate both photonic and electronic-band engineering in order to create novel surface-emitting quantum cascade microcavity laser sources. ...
    • Fabrication technologies for quantum cascade photonic-crystal microlasers 

      Colombelli, R.; Srinivasan, K.; Troccoli, M.; Painter, O.; Gmachl, C.; Tennant, D. M.; Sergent, A. M.; Sivco, D. L.; Cho, A. Y.; Capasso, Federico (IOP Publishing, 2004)
      In this paper we describe the technological and fabrication methods necessary to incorporate both photonic and electronic-band engineering in order to create novel surface-emitting quantum cascade microcavity laser sources. ...