Laser terahertz emission system to investigate hydrogen gas sensors

Kiwa, Toshihiko; Tsukada, Keiji; Suzuki, Masato; Tonouchi, Masayoshi; Migitaka, Sonoko; Yokosawa, Koichi
June 2005
Applied Physics Letters;6/27/2005, Vol. 86 Issue 26, p261102
Academic Journal
A laser terahertz emission system is proposed to investigate the catalytic metal/semiconductor interfaces of hydrogen sensors. Samples were fabricated by depositing a catalytic metal thin film on a semi-insulating silicon substrate. A femtosecond laser was used to radiate terahertz waves from the sample in a gas cell filled with a hydrogen and nitrogen gas mixture. The peak amplitude of the terahertz waves decreased with increasing hydrogen concentration. We also fabricated a metal-oxide-semiconductor field effect transistor hydrogen sensor, and compared its properties with the terahertz radiation properties. These results suggest that the laser terahertz emission system is a potential tool to investigate catalytic metal/semiconductor interfaces.


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