Share Email Print
cover

Proceedings Paper

A new mechanism for observation of THz acoustic waves: coherent THz radiation emission
Author(s): Evan J. Reed; Michael R. Armstrong; Ki-Yong Kim; James M. Glownia; William M. Howard; Edwin L.. Piner; John C. Roberts
Format Member Price Non-Member Price
PDF $14.40 $18.00

Paper Abstract

Our simulations and experiments demonstrate a new physical mechanism for detecting acoustic waves of THz frequencies. We find that strain waves of THz frequencies can coherently generate radiation when they propagate past an interface between materials with different piezoelectric coefficients. By considering AlN/GaN heterostructures, we show that the radiation is of detectable amplitude and contains sufficient information to determine the time-dependence of the strain wave with potentially sub-picosecond, nearly atomic time and space resolution. This mechanism is distinct from optical approaches to strain wave measurement. We demonstrate this phenomenon within the context of high amplitude THz frequency strain waves that spontaneously form at the front of shock waves in GaN crystals. We also show how the mechanism can be utilized to determine the layer thicknesses in thin film GaN/AlN heterostructures.

Paper Details

Date Published: 7 February 2009
PDF: 8 pages
Proc. SPIE 7214, Ultrafast Phenomena in Semiconductors and Nanostructure Materials XIII, 72140P (7 February 2009); doi: 10.1117/12.809326
Show Author Affiliations
Evan J. Reed, Lawrence Livermore National Lab. (United States)
Michael R. Armstrong, Lawrence Livermore National Lab. (United States)
Ki-Yong Kim, Los Alamos National Lab. (United States)
James M. Glownia, Los Alamos National Lab. (United States)
William M. Howard, Lawrence Livermore National Lab. (United States)
Edwin L.. Piner, Nitronex Corp. (United States)
John C. Roberts, Nitronex Corp. (United States)


Published in SPIE Proceedings Vol. 7214:
Ultrafast Phenomena in Semiconductors and Nanostructure Materials XIII
Kong-Thon Tsen; Jin-Joo Song; Markus Betz; Abdulhakem Y. Elezzabi, Editor(s)

© SPIE. Terms of Use
Back to Top