TY - JOUR
T1 - Thermal boundary resistance between GaN and cubic ice and THz acoustic attenuation spectrum of cubic ice from complex acoustic impedance measurements
AU - Mante, Pierre Adrien
AU - Chen, Chien Cheng
AU - Wen, Yu Chieh
AU - Sheu, Jinn Kong
AU - Sun, Chi Kuang
PY - 2013/11/25
Y1 - 2013/11/25
N2 - A phonon nanoscopy method, based on the picosecond ultrasonics technique, capable of studying the complex acoustic reflection coefficient at frequency up to 1 THz is proposed and demonstrated. By measuring the reflection coefficient at the same surface location at the interface between GaN and air, and between GaN and the material to characterize, we get access to the THz amplitude and phase spectra of the acoustic phonon reflection. The retrieval of both these pieces of information then allows the calculation of the attenuation in a wide range of frequency and gives new insight into the Kapitza anomaly. This method is then applied to cubic ice, and the measurements of the elastic properties, the phonon anharmonic decay spectrum up to 1 THz, as well as the measurements of the thermal phonon lifetime at 150 K are all achieved.
AB - A phonon nanoscopy method, based on the picosecond ultrasonics technique, capable of studying the complex acoustic reflection coefficient at frequency up to 1 THz is proposed and demonstrated. By measuring the reflection coefficient at the same surface location at the interface between GaN and air, and between GaN and the material to characterize, we get access to the THz amplitude and phase spectra of the acoustic phonon reflection. The retrieval of both these pieces of information then allows the calculation of the attenuation in a wide range of frequency and gives new insight into the Kapitza anomaly. This method is then applied to cubic ice, and the measurements of the elastic properties, the phonon anharmonic decay spectrum up to 1 THz, as well as the measurements of the thermal phonon lifetime at 150 K are all achieved.
UR - http://www.scopus.com/inward/record.url?scp=84888592458&partnerID=8YFLogxK
U2 - 10.1103/PhysRevLett.111.225901
DO - 10.1103/PhysRevLett.111.225901
M3 - Journal article
AN - SCOPUS:84888592458
SN - 0031-9007
VL - 111
JO - Physical Review Letters
JF - Physical Review Letters
IS - 22
M1 - 225901
ER -