Title: Single crystals based on hydrogen-bonding mediated cation-anion assembly with extremely large optical nonlinearity and their application for intense THz wave generation
Authors : Lee, Seung-Chul
Kang, Bong Joo
Lee, Ji-Ah
Lee, Seung-Heon
Jazbinsek, Mojca
Yoon, Woojin
Yun, Hoseop
Rotermund, Fabian
Kwon, O-Pil
Published in : Advanced optical materials
Volume(Issue) : 6
Issue : 10
Publisher / Ed. Institution : Wiley
Issue Date: 2018
License (according to publishing contract) : Licence according to publishing contract
Type of review: Not specified
Language : English
Subject (DDC) : 530: Physics
620.11: Engineering materials
Abstract: New molecular salt crystals based on linear‐shaped polymer‐like cation–anion assembly exhibiting extremely large nonlinear optical response and high THz generation efficiency are reported. Two hydroxy benzothialzolium PMB (2‐(4‐(4‐(hydroxymethyl)piperidin‐1‐yl)styryl)‐3‐methylbenzo[d]thiazol‐3‐ium) crystals with different benzenesulfonate counter anions provide isomorphic crystal structure with acentric monoclinic Cc space group symmetry. In contrast to previously reported benchmark nonlinear optical salt crystals with a parallel‐type cation–anion assembly, newly developed PMB‐based crystals exhibit a series‐type cation–anion assembly mediated by strong bidentate‐like hydrogen‐bonds. Such series‐type cation–anion assembly results in perfect alignment of highly nonlinear PMB cations in the crystalline state, leading to extremely large diagonal component of the second‐order nonlinear optical coefficient exceeding that of the state‐of‐the‐art nonlinear optical crystals. In THz wave generation experiments based on optical rectification, a 0.33 mm thick PMB crystal generates intense THz pulses with peak‐to‐peak THz electric field of 430 kV cm−1 and extremely broad flat spectrum with upper cut‐off frequency of above 8.0 THz. In addition, compared to inorganic standard 1.0 mm thick ZnTe crystals, the PMB crystal delivers a 24 times higher THz electric field and about 3 times broader bandwidth. Therefore, hydroxy benzothialzolium PMB crystals are highly desired novel materials for various nonlinear optical applications including THz photonics.
Departement: School of Engineering
Organisational Unit: Institute of Computational Physics (ICP)
Publication type: Article in scientific journal
DOI : 10.1002/adom.201701258
ISSN: 2195-1071
URI: https://digitalcollection.zhaw.ch/handle/11475/15445
Appears in Collections:Publikationen School of Engineering

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