Efficient gap‐free broadband terahertz generators based on new organic quinolinium single crystals

Shin, Myeong‐Hoon; Kim, Won Tae; Kim, Se‐In; Lee, Seung‐Heon; Yu, In Cheol; Jazbinsek, Mojca; Yoon, Woojin; Yun, Hoseop; Kim, Dongwook; Rotermund, Fabian; Kwon, O‐Pil

doi:10.1002/adom.201900953

Publication type:	Article in scientific journal
Type of review:	Not specified
Title:	Efficient gap‐free broadband terahertz generators based on new organic quinolinium single crystals
Authors:	Shin, Myeong‐Hoon Kim, Won Tae Kim, Se‐In Lee, Seung‐Heon Yu, In Cheol Jazbinsek, Mojca Yoon, Woojin Yun, Hoseop Kim, Dongwook Rotermund, Fabian Kwon, O‐Pil
et. al:	No
DOI:	10.1002/adom.201900953
Published in:	Advanced Optical Materials
Volume(Issue):	7
Issue:	21
Issue Date:	2019
Publisher / Ed. Institution:	Wiley
ISSN:	2195-1071
Language:	English
Subject (DDC):	621.3: Electrical, communications, control engineering
Abstract:	New organic electro‐optic crystals containing orthogonally oriented electron‐withdrawing groups are developed for efficient and gap‐free THz wave generation with a very flat broadband spectral shape. These crystals consist of 2‐(4‐hydroxystyryl)‐1‐methylquinolinium (OHQ) cationic chromophores and nonplanar 4‐(trifluoromethoxy)benzenesulfonate (TFO) anions with orthogonally oriented highly electronegative trifluoromethoxy groups capable of strong hydrogen bonds. OHQ‐TFO crystals exhibit enhanced macroscopic optical nonlinearity with a second harmonic generation efficiency 2.3 times greater than that of benchmark OHQ‐based crystals with conventional planar anions. This enhancement is attributed to reduced edge‐to‐face π–π interactions between cations and anions due to the orthogonal orientation and electron‐withdrawing characteristics of trifluoromethoxy groups. Moreover, OHQ‐TFO crystals exhibit excellent THz wave characteristics generated by optical rectification; 0.52 mm thick OHQ‐TFO crystal generate a peak‐to‐peak THz electric field 15 times higher than that of inorganic standard 1.0 mm thick ZnTe crystal and a broader spectrum with an upper cut‐off frequency near 8 THz at pump wavelengths of 1140–1500 nm. Unlike previously reported state‐of‐the‐art organic electro‐optic salt crystals with strong phonon absorption in the frequency range of 0.8–3 THz, OHQ‐TFO crystals facilitate gap‐free broadband THz wave generation without strong absorption modulations due to the strong hydrogen bond ability of trifluoromethoxy groups.
URI:	https://digitalcollection.zhaw.ch/handle/11475/19247
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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Shin, M.-H., Kim, W. T., Kim, S.-I., Lee, S.-H., Yu, I. C., Jazbinsek, M., Yoon, W., Yun, H., Kim, D., Rotermund, F., & Kwon, O.-P. (2019). Efficient gap‐free broadband terahertz generators based on new organic quinolinium single crystals. Advanced Optical Materials, 7(21). https://doi.org/10.1002/adom.201900953

Shin, M.-H. et al. (2019) ‘Efficient gap‐free broadband terahertz generators based on new organic quinolinium single crystals’, Advanced Optical Materials, 7(21). Available at: https://doi.org/10.1002/adom.201900953.

M.-H. Shin et al., “Efficient gap‐free broadband terahertz generators based on new organic quinolinium single crystals,” Advanced Optical Materials, vol. 7, no. 21, 2019, doi: 10.1002/adom.201900953.

SHIN, Myeong‐Hoon, Won Tae KIM, Se‐In KIM, Seung‐Heon LEE, In Cheol YU, Mojca JAZBINSEK, Woojin YOON, Hoseop YUN, Dongwook KIM, Fabian ROTERMUND und O‐Pil KWON, 2019. Efficient gap‐free broadband terahertz generators based on new organic quinolinium single crystals. Advanced Optical Materials. 2019. Bd. 7, Nr. 21. DOI 10.1002/adom.201900953

Shin, Myeong‐Hoon, Won Tae Kim, Se‐In Kim, Seung‐Heon Lee, In Cheol Yu, Mojca Jazbinsek, Woojin Yoon, et al. 2019. “Efficient Gap‐Free Broadband Terahertz Generators Based on New Organic Quinolinium Single Crystals.” Advanced Optical Materials 7 (21). https://doi.org/10.1002/adom.201900953.

Shin, Myeong-Hoon, et al. “Efficient Gap‐Free Broadband Terahertz Generators Based on New Organic Quinolinium Single Crystals.” Advanced Optical Materials, vol. 7, no. 21, 2019, https://doi.org/10.1002/adom.201900953.