Terahertz phonon mode engineering of highly efficient organic terahertz generators

Lee, Seung-Heon; Kang, Bong Joo; Yoo, Ba-Wool; Lee, Seung-Chul; Lee, Seung-Jun; Jazbinsek, Mojca; Yun, Hoseop; Rotermund, Fabian; Kwon, O-Pil

doi:10.1002/adfm.201605583

Publication type:	Article in scientific journal
Type of review:	Peer review (publication)
Title:	Terahertz phonon mode engineering of highly efficient organic terahertz generators
Authors:	Lee, Seung-Heon Kang, Bong Joo Yoo, Ba-Wool Lee, Seung-Chul Lee, Seung-Jun Jazbinsek, Mojca Yun, Hoseop Rotermund, Fabian Kwon, O-Pil
DOI:	10.1002/adfm.201605583
Published in:	Advanced Functional Materials
Volume(Issue):	27
Issue:	14
Page(s):	1605583
Issue Date:	2017
Publisher / Ed. Institution:	Wiley
ISSN:	1616-301X 1616-3028
Language:	English
Subject (DDC):	530: Physics 540: Chemistry 620: Engineering
Abstract:	For terahertz (THz) wave generators based on organic electrooptic crystals, their intrinsic phonon modes are playing an essential role in THz generation characteristics. Here, this study proposes an effective design strategy for THz phonon mode engineering of organic electrooptic salt crystals for efficient optical-to-THz frequency conversion. To reduce phonon-mode intensity, strongly electronegative trifuoromethyl group acting as strong hydrogen-bond acceptor is incorporated into molecular anions. New 2-(4-hydroxy-3-methoxystyryl)-1-methylquinolinium 4-(trifuoromethyl)benzenesulfonate (HMQ-4TFS) crystals exhibit a relatively small absorption coefficient in the THz spectral range between 0.5 and 4 THz, which is attributed to suppressed molecular vibrations due to strong hydrogen bonds involving the 4TFS anion. In addition, HMQ-4TFS crystals possess a very large macroscopic optical nonlinearity, comparable (or even higher) to benchmark stilbazolium crystals. Based on the low-intensity THz phonon modes and the large optical nonlinearity, a 0.37 mm thick HMQ-4TFS crystal pumped with 150 fs infrared laser pulses facilitates very efficient THz wave generation by optical rectification, delivering 23 times higher peak-to-peak THz electric eld than the widely used standard inorganic ZnTe crystal (1.0 mm thick) and a broader spectral bandwidth. Therefore, strongly electronegative groups introduced into molecular salt electrooptic crystals provide a very promising design strategy of THz phonon mode engineering for developing intense broadband THz sources.
URI:	https://digitalcollection.zhaw.ch/handle/11475/4154
Fulltext version:	Published version
License (according to publishing contract):	Licence according to publishing contract
Departement:	School of Engineering
Organisational Unit:	Institute of Computational Physics (ICP)
Appears in collections:	Publikationen School of Engineering

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Lee, S.-H., Kang, B. J., Yoo, B.-W., Lee, S.-C., Lee, S.-J., Jazbinsek, M., Yun, H., Rotermund, F., & Kwon, O.-P. (2017). Terahertz phonon mode engineering of highly efficient organic terahertz generators. Advanced Functional Materials, 27(14), 1605583. https://doi.org/10.1002/adfm.201605583

Lee, S.-H. et al. (2017) ‘Terahertz phonon mode engineering of highly efficient organic terahertz generators’, Advanced Functional Materials, 27(14), p. 1605583. Available at: https://doi.org/10.1002/adfm.201605583.

S.-H. Lee et al., “Terahertz phonon mode engineering of highly efficient organic terahertz generators,” Advanced Functional Materials, vol. 27, no. 14, p. 1605583, 2017, doi: 10.1002/adfm.201605583.

LEE, Seung-Heon, Bong Joo KANG, Ba-Wool YOO, Seung-Chul LEE, Seung-Jun LEE, Mojca JAZBINSEK, Hoseop YUN, Fabian ROTERMUND und O-Pil KWON, 2017. Terahertz phonon mode engineering of highly efficient organic terahertz generators. Advanced Functional Materials. 2017. Bd. 27, Nr. 14, S. 1605583. DOI 10.1002/adfm.201605583

Lee, Seung-Heon, Bong Joo Kang, Ba-Wool Yoo, Seung-Chul Lee, Seung-Jun Lee, Mojca Jazbinsek, Hoseop Yun, Fabian Rotermund, and O-Pil Kwon. 2017. “Terahertz Phonon Mode Engineering of Highly Efficient Organic Terahertz Generators.” Advanced Functional Materials 27 (14): 1605583. https://doi.org/10.1002/adfm.201605583.

Lee, Seung-Heon, et al. “Terahertz Phonon Mode Engineering of Highly Efficient Organic Terahertz Generators.” Advanced Functional Materials, vol. 27, no. 14, 2017, p. 1605583, https://doi.org/10.1002/adfm.201605583.