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Issue 35, 2018
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Terahertz radiation and second-harmonic generation from a single-component polar organic ferroelectric crystal

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Abstract

A rare single-component polar organic crystal with a distinctive four-fold screw axis is grown from a new dipole molecule, namely 4-(4-(methylthio)phenyl)-2,6-di(1H-pyrazol-1-yl)pyridine (UOH1). The polar molecular ordering is facilitated by a moderate molecular dipole moment (1.42 Debye) and supramolecular (S⋯H–C and N⋯H–C type hydrogen bonding and π–π stacking) interactions. Remarkably, a UOH1 crystal exhibits a ferroelectric hysteresis loop at room temperature without any discontinuity in temperature-dependent dielectric measurements. Additional advantages of this non-centrosymmetric UOH1 crystal are its high second-order nonlinear susceptibility, superior phase matching conditions and low THz absorption. As a result, UOH1 produces both second harmonic and terahertz (THz) waves with ample energy conversion efficiency. These combinations of properties demonstrate the direct technological usefulness of the UOH1 crystal as a non-linear optical and electro-optical material operating at ambient temperature.

Graphical abstract: Terahertz radiation and second-harmonic generation from a single-component polar organic ferroelectric crystal

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Publication details

The article was received on 30 May 2018, accepted on 10 Aug 2018 and first published on 10 Aug 2018


Article type: Communication
DOI: 10.1039/C8TC02638F
Citation: J. Mater. Chem. C, 2018,6, 9330-9335
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    Terahertz radiation and second-harmonic generation from a single-component polar organic ferroelectric crystal

    U. Venkataramudu, C. Sahoo, S. Leelashree, M. Venkatesh, D. Ganesh, S. R. G. Naraharisetty, A. K. Chaudhary, S. Srinath and R. Chandrasekar, J. Mater. Chem. C, 2018, 6, 9330
    DOI: 10.1039/C8TC02638F

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