Title :
Terahertz emission from lateral surge currents and suppression of dipoles under a metal mask
Author :
Barnes, M.E. ; McBryde, D. ; Berry, S.A. ; Gow, P.C. ; Daniell, Geoff J. ; Beere, H.E. ; Ritchie, D.A. ; Apostolopoulos, V.
Author_Institution :
Sch. of Phys. & Astron., Univ. of Southampton, Southampton, UK
Abstract :
Pulsed broadband terahertz emission can be observed from lateral diffusion currents near the surface of a partially metallic masked semiconductor after ultrafast photoexcitation. We present a theoretical mechanism for the emission based on diffusion and dipole suppression under the metal mask with supporting experimental and theoretical evidence.
Keywords :
photoexcitation; semiconductors; terahertz wave spectra; dipole suppression; lateral diffusion currents; lateral surge currents; metal mask; partially metallic masked semiconductor surface; pulsed broadband terahertz emission; ultrafast photoexcitation; Antenna measurements; Dipole antennas; Measurement by laser beam; Metals; Optical surface waves; Semiconductor device measurement;
Conference_Titel :
Infrared, Millimeter, and Terahertz Waves (IRMMW-THz), 2013 38th International Conference on
Conference_Location :
Mainz
DOI :
10.1109/IRMMW-THz.2013.6665434
