Title :
Observation of amplified stimulated terahertz emission in optically pumped epitaxial graphene heterostructures
Author :
Karasawa, Hiromi ; Watanabe, Takayuki ; Otsuji, Taiichi ; Ryzhii, Maxim ; Satou, Akira ; Ryzhii, Victor
Author_Institution :
RIEC Res. Inst. of Electr. Commun., Tohoku Univ., Sendai, Japan
Abstract :
We experimentally observed the fast relaxation and relatively slow recombination dynamics of photogenerated electrons/holes in an epitaxial graphene-on-Si heterostructure. The result is interpreted as an amplified stimulated THz emission and well supports the occurrence of negative dynamic conductivity in the terahertz spectral ranges.
Keywords :
Charge carrier processes; Conductivity; Electron optics; Laser excitation; Optical films; Optical pumping; Phonons; Probes; Spontaneous emission; Stimulated emission;
Conference_Titel :
Lasers and Electro-Optics (CLEO) and Quantum Electronics and Laser Science Conference (QELS), 2010 Conference on
Conference_Location :
San Jose, CA, USA
Print_ISBN :
978-1-55752-890-2
Electronic_ISBN :
978-1-55752-890-2
