Increased terahertz emission from SI-GaAs deposited with sub-wavelength spacing metal line array

• Main Authors: Faustino, Maria Angela B., Lopez, Lorenzo P., Jr., Afalla, Jessica Pauline, Muldera, Joselito E., Felix, Mark Jayson, Salvador, Arnel A., Somintac, Armando S., Estacio, Elmer S.
• Format: text
• Published: Animo Repository 2015
• Subjects: Gallium arsenide; Terahertz spectroscopy; Physics
• Online Access: https://animorepository.dlsu.edu.ph/faculty_research/8135
• Institution: De La Salle University

Increased terahertz (THz) emission of surface modified semi-insulating gallium arsenide (SI-GaAs) is reported. A metal line array with sub-wavelength spacing was fabricated via e-beam deposition and THz measurements were done in the transmission excitation geometry. Results show an order of magnitude THz broadband emission enhancement. Pump-power dependent measurements were also utilized which shows a nonlinear dependence with the THz integrated intensity. This broadband enhancement is currently attributed to super transmission owing to a non-linear optical effect that may be related to surface plasmon resonance.