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Nonlinear Optical Wavelength-conversion Between Wave and Light for Terahertz-Wave Generation and Detection

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What
  • Visitor Seminars
When Jun 06, 2014
from 03:00 PM to 04:00 PM
Where Engr. IV Bldg., Maxwell Room 57-124
Contact Name
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Hiroaki Minamide

Tera-photonics Team, RIKEN

 

Abstract

The development of nonlinear optical techniques has been extended into the terahertz (THz)-wave region, while THz waves have proved to be very attractive to both fundamental science and advanced industrial applications in recent years. In the early stage of THz research, we proposed a tunable THz-wave source is essential to exploit the underdeveloped THz region because no one knows which frequency is significant. We have developed coherent tunable THz-wave sources covering an ultra-wide spectral range [1-3] and the output power of our sources has been increasing. The developed THz-wave sources were based on both inorganic LiNbO3 (LN) and organic (DAST and BNA) crystals. Organic ones cover ultra-wide range from 0.5 to 50 THz, while LN 1 to 3 THz range. As for the output power, the peak-power reached kW-level for injection-seeded LN THz-wave parametric generator [4].

And also, the highly sensitive THz detection [5-7] in room temperature has been developed. By using reverse nonlinear process, THz-wave is up-converted to infrared optical wave, which enables to extract the information of THz wave including both amplitude and phase information. The high-sensitivity, rapid-response THz-wave detection at room temperature was carried out. By using DAST crystal, it is possible to realize ultra-wide frequency range with NEP of the pW/Hz1/2 at the room-temperature. Higher sensitivity using LN crystal was confirmed (~20pW/Hz1/2) compared to a typical liquid-He-cooled Si bolometer. The minimum detectable input power of terahertz-wave was less than 1 μW, corresponding dynamic range of more than 100 dB.

In this seminar, we report on widely tunable THz-wave sources and sensitive THz detection using nonlinear optical up-conversion.

 

Biography

Hiroaki Minamide (M’12) received the B.S. degree in communication engineering, and M.S. and Ph.D. degrees in electronic engineering from Tohoku University, Japan, in 1993, 1996, and 1999, respectively.

 In same year after Ph.D. student, he joined in a frontier researcher at the Photo-Dynamics Research Center of RIKEN and started to study on developing terahertz-wave source using nonlinear optical effect. He demonstrated a frequency-agile THz-wave in a ring-cavity configuration, which cover a wide frequency region from 1 to 3 THz. And he continuously joined in a new project of Teraphotonics team from 2005, RIKEN Sendai and he was a deputy team leader from 2007 to September 2010. His research is spread into development of ultra-wide tunable THz-wave in the frequency-region from sub-THz to several tens THz using organic nonlinear crystal. Additionally, high sensitive THz-wave detection with rapid time-response and room-temperature operation using nonlinear optical up-conversion is studied. From October 2010, he leads Teraphotonics team as a Team Leader in the second term of RIKEN THz research project. And now he is a Team Leader in new THz research project which starts from April 2013 in RIKEN. Recently, his research interests include high-power THz-wave generation and extremely sensitive THz-wave detection using nonlinear optics and their unique THz applications.

He is a member of The Institute of Electrical and Electronics Engineers (IEEE), Optical Society of America (OSA), The Japan Society of Applied Physics (JSAP), and The Laser Society of Japan.

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