||H. G. Roskos, M. C. Nuss, J. Shah, K. Leo,
D. A. B. Miller, A. M. Fox, S. Schmitt-Rink, K. Kohler "Coherent
submillimeter- wave emission from charge oscillations in a double-well potential"
Phys. Rev. Lett., 68, 2216-2219 (1992).
The authors directly observe the
electromagnetic radiation emitted by electrons coherently oscillating between the two
wells of a semiconductor coupled-quantum-well structure. Using time-resolved coherent
detection of the submillimeter-wave radiation from these spatial charge oscillations, they
trace up to fourteen oscillations at 1.5 THz before phase relaxation destroys the
coherence of the oscillating wave packet. In addition to the oscillatory electromagnetic
signal, they also observe an instantaneous signal from electric-field-induced optical
rectification in the semiconductor structure
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