Terahertz emission from GaAs-AlGaAs core-shell nanowires on Si (100) substrate: Effects of applied magnetic field and excitation wavelength

• Main Authors: Ibañes, Jasher John, Balgos, Maria Herminia, Jaculbia, Rafael, Salvador, Arnel A., Somintac, Armando, Estacio, Elmer, Que, Christopher T., Tsuzuki, Satoshi, Yamamoto, Kohji, Tani, Masahiko
• Format: text
• Published: Animo Repository 2013
• Subjects: Terahertz spectroscopy; Gallium arsenide; Physics
• Online Access: https://animorepository.dlsu.edu.ph/faculty_research/3271
• Institution: De La Salle University

Terahertz (THz) emission from GaAs-AlGaAs core-shell nanowires (CSNW) on silicon (100) substrates was investigated using THz time-domain spectroscopy. The applied magnetic field polarity dependence strongly suggests that THz emission originated from photo-carriers in the CSNWs. Optical excitation of the GaAs-AlGaAs core-shell yielded a wider THz emission bandwidth compared with that of just the GaAs core material. This result is currently attributed to faster carrier lifetimes in the AlGaAs shell. The THz emission spectral data are supported by time-resolved photoluminescence studies. © 2013 American Institute of Physics.