%0 Journal Article %J Semiconductor Science and Technology %D 1994 %T FAR-INFRARED SATURATION SPECTROSCOPY OF A SINGLE SQUARE-WELL %A Craig, K. %A Felix, C. L. %A Heyman, J. N. %A Markelz, A. G. %A Sherwin, M. S. %A Campman, K. L. %A Hopkins, P. F. %A Gossard, A. C. %X
We have performed saturation spectroscopy measurements of the lowest intersubband transition in a single 400 angstrom GaAs/Al0.3Ga0.7As modulation-doped square quantum well. We couple intense tunable far-infrared radiation from the Santa Barbara free electron laser into our sample using an edge-coupling technique and measure absorption as a function of frequency and intensity. Saturation and frequency shifts in the absorption line are clearly observed. We attribute the frequency shifts to reductions in the many-body depolarization shift. From our preliminary measurements, we estimate the intersubband relaxation time to be 600 ps to within a factor of three.
%B Semiconductor Science and Technology %V 9 %P 627-629 %8 May %@ 0268-1242 %G eng %M WOS:A1994NM75300061 %! Semicond. Sci. Technol. %R 10.1088/0268-1242/9/5S/061 %0 Journal Article %J Journal of Luminescence %D 1994 %T PROBING TERAHERTZ DYNAMICS IN SEMICONDUCTOR NANOSTRUCTURES WITH UCSB FREE-ELECTRON LASERS %A Allen, S. J. %A Craig, K. %A Felix, C. L. %A Guimaraes, P. %A Heyman, J. N. %A Kaminski, J. P. %A Keay, B. J. %A Markelz, A. G. %A Ramian, G. %A Scott, J. S. %A Sherwin, M. S. %A Campman, K. L. %A Hopkins, P. F. %A Gossard, A. C. %A Chow, D. %A Lui, M. %A Liu, T. Y. %XThe UCSB free-electron lasers provide kilowatts of continuously tunable radiation from 120 GHz to 4.8 THz. They have the most impact on terahertz science and technology that require a tunable, high power source to explore non-linear dynamics or that sacrifice incident power to recover the linear response of systems with very small cross-section. We describe three experiments that demonstrate the utility of these lasers in experiments on the terahertz dynamics of semiconductor nanostructures: (i) terahertz dynamics of resonant tunneling diodes, (ii) saturation spectroscopy of quantum wells and (iii) photon-assisted tunneling in superlattices.
%B Journal of Luminescence %V 60-1 %P 250-255 %8 Apr %@ 0022-2313 %G eng %M WOS:A1994NR36100065 %R 10.1016/0022-2313(94)90142-2 %0 Conference Proceedings %B SPIE Proceedings %D 1993 %T Far-infrared nonlinear response of electrons in semiconductor nanostructures %A Sherwin, M. S. %A Asmar, N. G. %A Bewley, W. W. %A Craig, K. %A Felix, C. L. %A Galdrikian, B. %A Gwinn, E. G. %A Markelz, A.G. %A Gossard, A. C. %A Hopkins, P. F. %A Sundaram, M. %A Birnir, B. %B SPIE Proceedings %V 1854 %P 36-47 %G eng