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Observation of Dynamical Franz‐Keldysh Effect
Author(s) -
Nordstrom K. B.,
Johnsen K.,
Allen S. J.,
Jauho A.P.,
Birnir B.,
Kono J.,
Noda T.,
Akiyama H.,
Sakaki H.
Publication year - 1997
Publication title -
physica status solidi (b)
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.51
H-Index - 109
eISSN - 1521-3951
pISSN - 0370-1972
DOI - 10.1002/1521-3951(199711)204:1<52::aid-pssb52>3.0.co;2-n
Subject(s) - terahertz radiation , semiconductor , physics , absorption (acoustics) , band gap , field (mathematics) , terahertz spectroscopy and technology , mixing (physics) , condensed matter physics , optoelectronics , optics , materials science , quantum mechanics , mathematics , pure mathematics
We observe the linear and non‐linear optical properties of a semiconductor multiple quantum well under intense terahertz irradiation to reveal a Dynamical Franz‐Keldysh Effect. It is characterized by increased sub‐gap absorption and oscillations in the absorption above the gap which vary with applied THz field and frequency. We also observe non‐linear mixing of near‐bandgap light of frequency Ω NIR with a strong Terahertz field of frequency ω THz to produce optical sidebands at frequencies Ω NIR ± 2 n ω THz . We discuss our results as a function of THz field and frequency, and compare them to our theoretical model.