Efficient terahertz-wave generation and its ultrafast optical modulation in charge ordered organic ferroelectrics

Hirotake Itoh; Keisuke Itoh; Kazuki Goto; Kaoru Yamamoto; Kyuya Yakushi; Shinichiro Iwai

doi:10.1063/1.4871735

Efficient terahertz-wave generation and its ultrafast optical modulation in charge ordered organic ferroelectrics

Hirotake Itoh, Keisuke Itoh, Kazuki Goto, Kaoru Yamamoto, Kyuya Yakushi, Shinichiro Iwai

Research output: Contribution to journal › Article › peer-review

11 Citations (Scopus)

Abstract

Efficient terahertz (THz) wave generation in strongly correlated organic compounds α-(ET)₂I₃ and α′-(ET) ₂IBr₂ (ET:bis(ethylenedithio)-tetrathiafulvalene) was demonstrated. The spontaneous polarization induced by charge ordering or electronic ferroelectricity was revealed to trigger the THz-wave generation via optical rectification; the estimated 2nd-order nonlinear optical susceptibility for α-(ET)₂I₃ is over 70 times larger than that for prototypical THz-source ZnTe. Ultrafast (<1 ps) and sensitive (∼40%) photoresponse of the THz wave was observed for α-(ET)₂I ₃, which is attributable to photoinduced quenching of the polarization accompanied by insulator(ferroelectric)-to-metal transition. Modulation of the THz wave was observed for α′-(ET) ₂IBr₂ upon the poling procedure, indicating the alignment of polar domains.

Original language	English
Article number	173302
Journal	Applied Physics Letters
Volume	104
Issue number	17
DOIs	https://doi.org/10.1063/1.4871735
Publication status	Published - 2014 Apr 28

ASJC Scopus subject areas

Physics and Astronomy (miscellaneous)

Access to Document

10.1063/1.4871735

Cite this

@article{3a56b8ed624e40e6971dd6518e90aa37,

title = "Efficient terahertz-wave generation and its ultrafast optical modulation in charge ordered organic ferroelectrics",

abstract = "Efficient terahertz (THz) wave generation in strongly correlated organic compounds α-(ET)2I3 and α′-(ET) 2IBr2 (ET:bis(ethylenedithio)-tetrathiafulvalene) was demonstrated. The spontaneous polarization induced by charge ordering or electronic ferroelectricity was revealed to trigger the THz-wave generation via optical rectification; the estimated 2nd-order nonlinear optical susceptibility for α-(ET)2I3 is over 70 times larger than that for prototypical THz-source ZnTe. Ultrafast (<1 ps) and sensitive (∼40%) photoresponse of the THz wave was observed for α-(ET)2I 3, which is attributable to photoinduced quenching of the polarization accompanied by insulator(ferroelectric)-to-metal transition. Modulation of the THz wave was observed for α′-(ET) 2IBr2 upon the poling procedure, indicating the alignment of polar domains.",

author = "Hirotake Itoh and Keisuke Itoh and Kazuki Goto and Kaoru Yamamoto and Kyuya Yakushi and Shinichiro Iwai",

year = "2014",

month = apr,

day = "28",

doi = "10.1063/1.4871735",

language = "English",

volume = "104",

journal = "Applied Physics Letters",

issn = "0003-6951",

publisher = "American Institute of Physics Publising LLC",

number = "17",

}

TY - JOUR

T1 - Efficient terahertz-wave generation and its ultrafast optical modulation in charge ordered organic ferroelectrics

AU - Itoh, Hirotake

AU - Itoh, Keisuke

AU - Goto, Kazuki

AU - Yamamoto, Kaoru

AU - Yakushi, Kyuya

AU - Iwai, Shinichiro

PY - 2014/4/28

Y1 - 2014/4/28

N2 - Efficient terahertz (THz) wave generation in strongly correlated organic compounds α-(ET)2I3 and α′-(ET) 2IBr2 (ET:bis(ethylenedithio)-tetrathiafulvalene) was demonstrated. The spontaneous polarization induced by charge ordering or electronic ferroelectricity was revealed to trigger the THz-wave generation via optical rectification; the estimated 2nd-order nonlinear optical susceptibility for α-(ET)2I3 is over 70 times larger than that for prototypical THz-source ZnTe. Ultrafast (<1 ps) and sensitive (∼40%) photoresponse of the THz wave was observed for α-(ET)2I 3, which is attributable to photoinduced quenching of the polarization accompanied by insulator(ferroelectric)-to-metal transition. Modulation of the THz wave was observed for α′-(ET) 2IBr2 upon the poling procedure, indicating the alignment of polar domains.

AB - Efficient terahertz (THz) wave generation in strongly correlated organic compounds α-(ET)2I3 and α′-(ET) 2IBr2 (ET:bis(ethylenedithio)-tetrathiafulvalene) was demonstrated. The spontaneous polarization induced by charge ordering or electronic ferroelectricity was revealed to trigger the THz-wave generation via optical rectification; the estimated 2nd-order nonlinear optical susceptibility for α-(ET)2I3 is over 70 times larger than that for prototypical THz-source ZnTe. Ultrafast (<1 ps) and sensitive (∼40%) photoresponse of the THz wave was observed for α-(ET)2I 3, which is attributable to photoinduced quenching of the polarization accompanied by insulator(ferroelectric)-to-metal transition. Modulation of the THz wave was observed for α′-(ET) 2IBr2 upon the poling procedure, indicating the alignment of polar domains.

UR - http://www.scopus.com/inward/record.url?scp=84899829102&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=84899829102&partnerID=8YFLogxK

U2 - 10.1063/1.4871735

DO - 10.1063/1.4871735

M3 - Article

AN - SCOPUS:84899829102

SN - 0003-6951

VL - 104

JO - Applied Physics Letters

JF - Applied Physics Letters

IS - 17

M1 - 173302

ER -

Efficient terahertz-wave generation and its ultrafast optical modulation in charge ordered organic ferroelectrics

Abstract

ASJC Scopus subject areas

Access to Document

Other files and links

Fingerprint

Cite this