Progress is described in experiments to generate coherent terahertz acoustic phonons in silicon doping superlattices by the resonant absorption of nanosecond-pulsed far-infrared laser radiation. Future experiments are proposed that would use the superlattice as a transducer in a terahertz cryogenic acoustic reflection microscope with sub-nanometer resolution.
Wilson TE. “Progress towards terahertz acoustic phonon generation in doping superlattices.” In proceedings of SPIE 6010, Infrared to Terahertz Technologies for Health and the Environment, Belyanin A, Drezek R, Gmachl C, editors, Vol. 6010, 601007, (2005)