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Orthogonal Molecular Assembly: Eliminating Intrinsic Phonon Modes in Organic THz Generators
  • Kim, Seung Jun ;
  • Seok, Jin Hong ;
  • Yu, In Cheol ;
  • Lee, Jeong Hyeon ;
  • Kim, Won Tae ;
  • Shin, Bong Rim ;
  • Yoon, Ga Eun ;
  • Lee, Yun Sang ;
  • Kim, Jin Chul ;
  • Yoon, Woojin ;
  • Yun, Hoseop ;
  • Jazbinsek, Mojca ;
  • Kwak, Sang Kyu ;
  • Rotermund, Fabian ;
  • Kwon, O. Pil
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dc.contributor.authorKim, Seung Jun-
dc.contributor.authorSeok, Jin Hong-
dc.contributor.authorYu, In Cheol-
dc.contributor.authorLee, Jeong Hyeon-
dc.contributor.authorKim, Won Tae-
dc.contributor.authorShin, Bong Rim-
dc.contributor.authorYoon, Ga Eun-
dc.contributor.authorLee, Yun Sang-
dc.contributor.authorKim, Jin Chul-
dc.contributor.authorYoon, Woojin-
dc.contributor.authorYun, Hoseop-
dc.contributor.authorJazbinsek, Mojca-
dc.contributor.authorKwak, Sang Kyu-
dc.contributor.authorRotermund, Fabian-
dc.contributor.authorKwon, O. Pil-
dc.date.issued2022-12-05-
dc.identifier.issn2195-1071-
dc.identifier.urihttps://aurora.ajou.ac.kr/handle/2018.oak/32920-
dc.identifier.urihttps://www.scopus.com/inward/record.uri?partnerID=HzOxMe3b&scp=85137938207&origin=inward-
dc.description.abstractThis work reports a series of new organic electro-optic salt crystals possessing unusual orthogonal dipole-coupling assembly that act as dimple-free THz generators. In the new crystals, optically anisotropic aromatic anions introducing highly electronegative fluorinated substituents are orthogonally assembled with optically anisotropic nonlinear optical benzothiazolium cations. These orthogonal cation–anion assembled crystals exhibit strong suppression of intrinsic THz phonon modes along the polar axis, which results in a wide THz absorption-free range from 1.5 to 4.0 THz without substantial absorption peaks. This is sharply in contrast to previous benchmark crystals with parallel cation–anion assembly; for example, in analogous crystals, several strong absorption peaks appear in this frequency range. This absence of strong absorption peaks is attributed to the orthogonal cation–anion dipole coupling assembly, the formation of fluorinate-induced strong interionic interactions, and a high packing ability of uniaxial anions. With top-level macroscopic optical nonlinearity, new orthogonal-dipole assembled crystals make dimple-free THz wave generation possible in the range of about 1.5–4.0 THz, which is very beneficial for characterizing signature peaks related to molecular phonon motions of analytes in THz spectroscopy. Therefore, orthogonal molecular assembly of optically highly anisotropic molecules provides an efficient way to substantially reduce and control intrinsic THz phonon modes.-
dc.description.sponsorshipS.J.K., J.H.S., I.C.Y., and J.H.L. contributed equally to this work. This work has been supported by the National Research Foundation of Korea (NRF) funded by the Ministry of Science, ICT & Future Planning, Korea (Nos. 2019K1A3A1A14057973, 2021R1A2C1005012, 2021R1A5A6002853, 2019R1A2C33003504, and 2020R1A4A2002828) and Swiss National Science Foundation (SNSF), Switzerland (No. IZKSZ2_188194).-
dc.language.isoeng-
dc.publisherJohn Wiley and Sons Inc-
dc.subject.meshAbsorption peaks-
dc.subject.meshCation-anions-
dc.subject.meshDipole coupling-
dc.subject.meshElectro-optics-
dc.subject.meshMolecular assembly-
dc.subject.meshOrganics-
dc.subject.meshOrthogonal dipoles-
dc.subject.meshPhonon mode-
dc.subject.meshSalt crystals-
dc.subject.meshStrong absorptions-
dc.titleOrthogonal Molecular Assembly: Eliminating Intrinsic Phonon Modes in Organic THz Generators-
dc.typeArticle-
dc.citation.number23-
dc.citation.titleAdvanced Optical Materials-
dc.citation.volume10-
dc.identifier.bibliographicCitationAdvanced Optical Materials, Vol.10 No.23-
dc.identifier.doi10.1002/adom.202102654-
dc.identifier.scopusid2-s2.0-85137938207-
dc.identifier.urlhttp://onlinelibrary.wiley.com/journal/10.1002/(ISSN)2195-1071-
dc.subject.keywordelectro-optics-
dc.subject.keywordnonlinear optics-
dc.subject.keywordoptical anisotropy-
dc.subject.keywordphonons-
dc.subject.keywordterahertz waves-
dc.type.otherArticle-
dc.description.isoafalse-
dc.subject.subareaElectronic, Optical and Magnetic Materials-
dc.subject.subareaAtomic and Molecular Physics, and Optics-
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