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We have investigated the terahertz (THz) emission from lithium ternary chalcopyrite crystals illuminated by 1560-nm femtosecond pump laser pulses. Monocyclic THz emission and narrowband THz emission from the coherent phonons in LiInSe2 and LiGaSe2 were observed at 2.87 and 3.45 THz, respectively.
Pump and probe THz emission microscope has been developed with a special resolution of less than 1 μm, and applied for the study of dynamic response of photoconductive antennas made of SI-GaAs, and LT-GaAs. The result revealed that spatial screening effect plays an important role of enhancement of the THz emission near.
Azimuthal angle dependence of the terahertz radiation of (100) p-type InAs under 1-T field is presented. Four-fold symmetry for p-polarized radiation emerged and the same is seen for the s-polarized radiation for the no-field case.
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...
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