Gopakumar Ramakrishnan

Summary

Affiliation: Delft University of Technology
Country: The Netherlands

Publications

  1. doi request reprint Terahertz generation from graphite
    Gopakumar Ramakrishnan
    Optics Research Group, Department of Imaging Science and Technology, Faculty of Applied SciencesDelft University of Technology, Lorentzweg 1, 2628 CJ Delft, The Netherlands
    Opt Express 17:16092-9. 2009
  2. doi request reprint Enhanced terahertz emission by coherent optical absorption in ultrathin semiconductor films on metals
    Gopakumar Ramakrishnan
    Optics Research Group, Department of Imaging Science and Technology, Faculty of Applied Sciences, Delft University of Technology, Lorentzweg 1, 2628 CJ Delft, The Netherlands
    Opt Express 21:16784-98. 2013
  3. doi request reprint Percolation-enhanced generation of terahertz pulses by optical rectification on ultrathin gold films
    Gopakumar Ramakrishnan
    Optics Research Group, Department of Imaging Science and Technology, Faculty of Applied Sciences, Delft University of Technology, Lorentzweg 1, 2628 CJ Delft, The Netherlands
    Opt Lett 36:2572-4. 2011
  4. ncbi request reprint Surface plasmon-enhanced terahertz emission from a hemicyanine self-assembled monolayer
    Gopakumar Ramakrishnan
    Optics Research Group, Department of Imaging Science and Technology, Faculty of Applied Sciences, Delft University of Technology, Lorentzweg 1, 2628 CJ Delft, The Netherlands
    Opt Express 20:4067-73. 2012

Detail Information

Publications4

  1. doi request reprint Terahertz generation from graphite
    Gopakumar Ramakrishnan
    Optics Research Group, Department of Imaging Science and Technology, Faculty of Applied SciencesDelft University of Technology, Lorentzweg 1, 2628 CJ Delft, The Netherlands
    Opt Express 17:16092-9. 2009
    ..We show that other forms of graphite, such as a pencil drawing on paper, are also capable of emitting THz pulses...
  2. doi request reprint Enhanced terahertz emission by coherent optical absorption in ultrathin semiconductor films on metals
    Gopakumar Ramakrishnan
    Optics Research Group, Department of Imaging Science and Technology, Faculty of Applied Sciences, Delft University of Technology, Lorentzweg 1, 2628 CJ Delft, The Netherlands
    Opt Express 21:16784-98. 2013
    ..As an application of our findings we demonstrate how such thin films can be used to turn standard optical components, such as paraboloidal mirrors, into self-focusing terahertz emitters. ..
  3. doi request reprint Percolation-enhanced generation of terahertz pulses by optical rectification on ultrathin gold films
    Gopakumar Ramakrishnan
    Optics Research Group, Department of Imaging Science and Technology, Faculty of Applied Sciences, Delft University of Technology, Lorentzweg 1, 2628 CJ Delft, The Netherlands
    Opt Lett 36:2572-4. 2011
    ..Our measurements suggest that the emission is through a second-order nonlinear optical rectification process, enhanced by the excitation of localized surface plasmon hot spots on the percolated metal film...
  4. ncbi request reprint Surface plasmon-enhanced terahertz emission from a hemicyanine self-assembled monolayer
    Gopakumar Ramakrishnan
    Optics Research Group, Department of Imaging Science and Technology, Faculty of Applied Sciences, Delft University of Technology, Lorentzweg 1, 2628 CJ Delft, The Netherlands
    Opt Express 20:4067-73. 2012
    ..2 nm is deposited on the gold film, stronger terahertz emission is observed. Our experimental results confirm that enhanced terahertz emission is possible from planar gold surfaces when surface plasmons are excited...