Title: Benzothiazolium single crystals : a new class of nonlinear optical crystals with efficient THz wave generation
Authors : Lee, Seung-Heon
Lu, Jian
Lee, Seung-Jun
Han, Jae-Hyun
Jeong, Chan-Uk
Lee, Seung-Chul
Li, Xian
Jazbinsek, Mojca
Yoon, Woojin
Yun, Hoseop
Kang, Bong Joo
Rotermund, Fabian
Nelson, Keith A.
Kwon, O-Pil
Published in : Advanced Materials
Volume(Issue) : 29
Issue : 30
Pages : 1701748
Publisher / Ed. Institution : Wiley
Issue Date: 2017
Language : Englisch / English
Subjects : Nonlinear optics; Organic crystal; Terahertz wave
Subject (DDC) : 530: Physik
540: Chemie
Abstract: Highly efficient nonlinear optical organic crystals are very attractive for various photonic applications including terahertz (THz) wave generation. Up to now, only two classes of ionic crystals based on either pyridinium or quinolinium with extremely large macroscopic optical nonlinearity have been developed. This study reports on a new class of organic nonlinear optical crystals introducing electron-accepting benzothiazolium, which exhibit higher electron-withdrawing strength than pyridinium and quinolinium in benchmark crystals. The benzothiazolium crystals consisting of new acentric core HMB (2-(4-hydroxy-3-methoxystyryl)-3-methylbenzo[d]thiazol-3-ium) exhibit extremely large macroscopic optical nonlinearity with optimal molecular ordering for maximizing the diagonal second-order nonlinearity. HMB-based single crystals prepared by simple cleaving method satisfy all required crystal characteristics for intense THz wave generation such as large crystal size with parallel surfaces, moderate thickness and high optical quality with large optical transparency range (580-1620 nm). Optical rectification of 35 fs pulses at the technologically very important wavelength of 800 nm in 0.26 mm thick HMB crystal leads to one order of magnitude higher THz wave generation efficiency with remarkably broader bandwidth compared to standard inorganic 0.5 mm thick ZnTe crystal. Therefore, newly developed HMB crystals introducing benzothiazolium with extremely large macroscopic optical nonlinearity are very promising materials for intense broadband THz wave generation and other nonlinear optical applications.
Departement: School of Engineering
Organisational Unit: Institute of Computational Physics (ICP)
Publication type: Beitrag in wissenschaftlicher Zeitschrift / Article in scientific Journal
Type of review: Peer review (Publikation)
DOI : 10.1002/adma.201701748
ISSN: 0935-9648
1521-4095
PMID : 28589627
URI: https://digitalcollection.zhaw.ch/handle/11475/4159
License (according to publishing contract) : Lizenz gemäss Verlagsvertrag / Licence according to publishing contract
Appears in Collections:Publikationen School of Engineering

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