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

fYear

2009

fDate

21-25 Sept. 2009

Firstpage

1

Lastpage

2

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;

fLanguage

English

Publisher

ieee

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

Type

conf

DOI

10.1109/ICIMW.2009.5325601

Filename

5325601