Title :
Plasma waves in graphene-based heterostructures and their terahertz device applications
Author :
Ryzhii, Victor ; Satou, Akira ; Ryzhii, Maxim ; Vasko, Fedir ; Otsuji, Taiichi
Author_Institution :
Univ. of Aizu, Aizu
Abstract :
The plasma waves in graphene- based heterostuctures can be used in novel devices for generation, frequency multiplication, and detection of terahertz radiation surpassing the devices made of A3B5 heterostructures. The dynamic AC conductivity in optically pumped graphene can be negative in a certain range (terahertz) of frequencies. This can lead to the self-excitation of terahertz plasma waves followed by their conversion to terahertz electromagnetic radiation. The negativity of the dynamic conductivity can also be used in terahertz lasers with optically pumped graphene active region. Since the energy relaxation and recombination processes affect the properties of the electron-hole system in graphene, the characteristics of these processes are analysed.
Keywords :
electron-hole recombination; graphite; plasma devices; plasma transport processes; plasma waves; semiconductor heterojunctions; submillimetre wave devices; dynamic AC conductivity; electron-hole recombination process; energy relaxation; frequency multiplication; graphene-based heterostructures; optically pumped graphene; plasma waves; standard semiconductor heterostructures; terahertz device applications; terahertz electromagnetic radiation; terahertz plasma waves self-excitation; terahertz radiation detection; Conductivity; Electromagnetic radiation; Frequency conversion; Laser excitation; Optical pumping; Plasma waves; Pump lasers; Radiation detectors; Spontaneous emission; Submillimeter wave devices;
Conference_Titel :
Semiconductor Device Research Symposium, 2007 International
Conference_Location :
College Park, MD
Print_ISBN :
978-1-4244-1892-3
Electronic_ISBN :
978-1-4244-1892-3
DOI :
10.1109/ISDRS.2007.4422510
