In analogy to the amplification of light in a laser, vibrations of a semiconductor crystal, so called phonons, were enhanced by interaction with an electron current. Excitation of a metal-semiconductor nanostructure by intense terahertz (THz) pulses results in a ten-fold amplification of longitudinal optical (LO) phonons at a frequency of 9 THz. Coupling such lattice motions to propagating sound waves holds potential for ultrasound imaging with a sub-nanometer spatial resolution.
from Top Technology News -- ScienceDaily https://ift.tt/2OIkdtf
Wednesday, 3 April 2019
Amplifier for terahertz lattice vibrations in a semiconductor crystal
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