Title :
Simulations of high-power pulsed terahertz sources using laser-assisted field emission
Author :
Hagmann, Mark J.
Author_Institution :
CTO NewPath Res. L.L.C., Salt Lake City
Abstract :
We are studying ultrafast optoelectronics in a new medium the clean surface of a nanoscale tip of a polyvalent refractory metal in vacuum during field emission. Field emission of electrons responds to changes in the potential in less than 2 fs, so the speed is only limited by the means that are used to couple to these pulses in the current. Extremely high current densities occur in field emission, up to 109 A/m2 in steady-state, or 1012 A/ m2 with pulsed operation, so that nanoscale sources could have a high energy output. This calculation is supported by measurements of laser-assisted field emission with femtosecond lasers.
Keywords :
current density; field emission; high-speed optical techniques; laser beam applications; photoemission; refractories; clean nanoscale tip surface; current densities; femtosecond lasers; high-power pulsed terahertz source simulation; laser-assisted field emission; nanoscale sources; polyvalent refractory metal nanoscale tip; ultrafast optoelectronics; vacuum condition; Current density; Nonlinear optics; Optical imaging; Optical pulses; Optical refraction; Power lasers; Quantum cascade lasers; Spectroscopy; Stress; Ultrafast optics;
Conference_Titel :
Vacuum Nanoelectronics Conference, 2007. IVNC. IEEE 20th International
Conference_Location :
Chicago, IL
Print_ISBN :
978-1-4244-1133-7
Electronic_ISBN :
978-1-4244-1134-4
DOI :
10.1109/IVNC.2007.4480980
