2 Department of Applied Physics, The University of Tokyo, Bunkyo, Tokyo 113-8656, Japan
3 National Institute of Advanced Industrial Science and Technology (AIST), Tsukuba, Ibaraki 305-8562, Japan
4 CREST, Japan Science and Technology Agency (JST), Chiyoda, Tokyo 102-0076, Japan
Received 31 May 2014, accepted for publication 27 June 2014. Published 3 September 2014.
© 2014 The Japan Society of Applied Physics
Terahertz radiation by optical rectification has been observed at room temperature in a hydrogen-bonded organic molecular ferroelectric crystal, 2-phenyl malondialdehyde (PhMDA). The radiated electromagnetic wave consisted of a single-cycle terahertz pulse with a temporal width of ~0.5 ps. The terahertz radiation amplitude divided by the sample thickness in PhMDA was nearly equivalent to that in a typical terahertz wave emitter ZnTe. This is attributable to a long coherence length in the range of 130–800 µm for the terahertz radiation from PhMDA. We also discussed the possibility of PhMDA as a terahertz wave emitter in terms of the phase-matching condition.