Modulation of terahertz emission in time-domain waveform via a photoinduced phase transition in a charge ordered organic ferroelectric

Hirotake Itoh, Rina Fujiwara, Yohei Kawakami, Kaoru Yamamoto, Yuto Nakamura, Hideo Kishida, Shinichiro Iwai

Research output: Contribution to journalArticlepeer-review

4 Citations (Scopus)

Abstract

The time-domain waveform of the terahertz (THz) electric field emitted from the charge-ordered organic ferroelectrics α - (ET)2I3 [ET:bis(ethylenedithio)-tetrathiafulvalene)] can be significantly modulated depending on incident fluence of femtosecond pulses. Weak irradiation triggers the emission, showing ∼1 THz oscillation in the time-domain waveform with more than 5 oscillation cycles and a corresponding narrow spectral shape. In contrast, strong irradiation almost completely suppresses the trailing portion of the waveform after the first cycle, resulting in over 3 times broader bandwidth. As revealed by time-resolved experiments, this modulation arises from the cooperative nature of photoinduced melting of the charge order accompanying quenching of infrared-activity of the intermolecular vibrations which strongly couple with the emission.

Original languageEnglish
Article number093302
JournalApplied Physics Letters
Volume112
Issue number9
DOIs
Publication statusPublished - 2018 Feb 26

ASJC Scopus subject areas

  • Physics and Astronomy (miscellaneous)

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