Title :
Transmission-Mode Scanning Probe Laser Terahertz Emission Microscope
Author :
Uchida, N. ; Inoue, R. ; Kawayama, I. ; Murakami, H. ; Tonouchi, M.
Author_Institution :
Inst. of Laser Eng., Osaka Univ., Suita
Abstract :
We developed a transmission-mode scanning probe laser terahertz emission microscope (sp-LTEM). Femtosecond (fs) optical pulses are delivered and focused on the sample by an optical fiber probe with a beam diameter of 5 mum. The transmission-mode sp-LTEM system is superior to the conventional reflection-mode sp-LTEM system in the viewpoint of the signal sensitivity because emitted THz waves can be detected without being disturbed by the scanning probe itself. The spatial resolution is experimentally estimated as ~2 mum with the gold line and space patterns on a low-temperature-grown gallium arsenide (LT-GaAs) substrate.
Keywords :
III-V semiconductors; fibre optic sensors; gallium arsenide; high-speed optical techniques; measurement by laser beam; microwave photonics; optical focusing; optical microscopy; scanning probe microscopy; submillimetre wave devices; submillimetre wave imaging; GaAs; THz waves; femtosecond optical pulses; laser focusing; laser terahertz emission microscope; low-temperature-grown gallium arsenide substrate; signal sensitivity; size 5 mum; transmission-mode scanning probe laser microscope; Fiber lasers; Gallium arsenide; Gold; Laser beams; Microscopy; Optical fibers; Optical pulses; Probes; Spatial resolution; Ultrafast optics;
Conference_Titel :
Infrared Millimeter Waves and 14th International Conference on Teraherz Electronics, 2006. IRMMW-THz 2006. Joint 31st International Conference on
Conference_Location :
Shanghai
Print_ISBN :
1-4244-0399-5
Electronic_ISBN :
1-4244-0400-2
DOI :
10.1109/ICIMW.2006.368793
