December 5, 2019
2:00 PM - 3:00 PM
William Eckhardt Research Center, Rm 201B
Host: Prof. Tian Zhong
Thomas E. Wilson, Ph.D.
Professor of Physics, Marshall University
Discuss a novel coherent 1.0 THz nanosecond-pulsed acoustic phonon source for both longitudinal and transverse polarization. It is a self-starting, mirrorless acoustic phonon phase-conjugate oscillator (APO) created by acousto-optic degenerate four-wave mixing in a THz-laser-pumped silicon doping superlattice (DSL). Coherent nanosecond-pulsed THz compressional and shear waves with different pumping thresholds are observed, consistent with distributed feedback within the DSL, when pumped by modest
(10 mW pulsed THz laser radiation). Conversion efficiency (light to phonon) is estimated to be 0.1%. The APO may find application in a first experimental verification of THz cavity-coupled hybrid acoustic phonon and mechanically stress-split Si:B acceptor qubits, previously discussed by
Soykal et. al., so-called “phonitons”.