Title :
Terahertz radiation from standing wave modes in GaN-based piezoelectric heterostructures
Author :
Jho, Young-Dahl ; Jeong, Hoonill ; Jeong, Jihoon ; Kim, Dai-Sik ; Stanton, Christopher J. ; Oh, E.
Author_Institution :
Gwangju Inst. of Sci. & Technol. (GIST), Gwangju, South Korea
Abstract :
We report a newly found nano-acoustic motion of standing waves in an impedance-mismatched layer sandwiched by GaN-based piezoelectric heterostructures. The corresponding THz radiation features have been investigated in terms of the relevant layer thickness. If necessary, time-resolved photo-reflectance was performed to verify the spatial origins and to probe the decay dynamics of the standing waves within ~50 ps.
Keywords :
III-V semiconductors; acoustic waves; gallium compounds; photoreflectance; piezoelectric semiconductors; semiconductor heterojunctions; terahertz waves; GaN; GaN-based piezoelectric heterostructures; impedance-mismatched layer; nano-acoustic standing wave motion; standing wave decay dynamics; terahertz radiation; time-resolved photo-reflectance; Acoustic beams; Acoustic waves; Electrons; Gallium nitride; Laser beams; Laser excitation; Phonons; Probes; Pump lasers; Ultrafast optics;
Conference_Titel :
Infrared, Millimeter, and Terahertz Waves, 2009. IRMMW-THz 2009. 34th International Conference on
Conference_Location :
Busan
Print_ISBN :
978-1-4244-5416-7
Electronic_ISBN :
978-1-4244-5417-4
DOI :
10.1109/ICIMW.2009.5325601
