Local rigidity by flexibility : unusual design for organic THz‐device materials

Kim, Dong‐Joo; Yu, In Cheol; Jazbinsek, Mojca; Kim, Chaeyoon; Yoon, Woojin; Yun, Hoseop; Kim, Sang‐Wook; Kim, Dongwook; Rotermund, Fabian; Kwon, O‐Pil

doi:10.1002/adom.202300807

Please use this identifier to cite or link to this item: https://doi.org/10.21256/zhaw-30340

Publication type:	Article in scientific journal
Type of review:	Peer review (publication)
Title:	Local rigidity by flexibility : unusual design for organic THz‐device materials
Authors:	Kim, Dong‐Joo Yu, In Cheol Jazbinsek, Mojca Kim, Chaeyoon Yoon, Woojin Yun, Hoseop Kim, Sang‐Wook Kim, Dongwook Rotermund, Fabian Kwon, O‐Pil
et. al:	No
DOI:	10.1002/adom.202300807 10.21256/zhaw-30340
Published in:	Advanced Optical Materials
Volume(Issue):	11
Issue:	21
Page(s):	2300807
Issue Date:	6-Nov-2023
Publisher / Ed. Institution:	Wiley
ISSN:	2195-1071
Language:	English
Subjects:	THz Photonics; Nonlinear optics; Organic crystals; THz waves
Subject (DDC):	621.3: Electrical, communications, control engineering
Abstract:	Terahertz (THz) waves interact with molecular phonon vibrations of organic matter. When designing organic THz-device materials, conformational flexible groups (CFGs) are in most cases avoided. CFGs create many low-energy conformers with high conformational entropy, which results in large and many phonon vibration modes that lead to undesired self-absorption of THz waves. Here, nonpolar CFGs only having weak intermolecular interaction capability are unusually introduced into organic THz-device materials, utilized for efficient THz wave generation. Newly designed THz-source crystals possess nonpolar methylene (CH2)n units having high conformational flexibility. Compared to previously reported benchmark crystals without methylene CFGs, introducing methylene CFGs significantly reduces void volume in newly designed crystals. This leads to the suppression of molecular phonon vibrations below 2.0 THz (i.e., introducing flexibility results in local rigidity). At infrared pump wavelengths, new CFG-contained crystals generate a strong THz electric field that is one order of magnitude stronger than that generated in inorganic ZnTe crystals. CFG-contained crystals exhibit a flatter spectral shape of the generated THz wave than benchmark crystals without methylene CFGs. Therefore, the introduction of CFGs is a very intriguing design strategy for organic THz-device materials to reduce the limitations caused by phonon vibrations.
URI:	https://digitalcollection.zhaw.ch/handle/11475/30340
Fulltext version:	Accepted version
License (according to publishing contract):	Licence according to publishing contract
Restricted until:	2024-06-23
Departement:	School of Engineering
Organisational Unit:	Institute of Computational Physics (ICP)
Appears in collections:	Publikationen School of Engineering

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Kim, D.-J., Yu, I. C., Jazbinsek, M., Kim, C., Yoon, W., Yun, H., Kim, S.-W., Kim, D., Rotermund, F., & Kwon, O.-P. (2023). Local rigidity by flexibility : unusual design for organic THz‐device materials. Advanced Optical Materials, 11(21), 2300807. https://doi.org/10.1002/adom.202300807

Kim, D.-J. et al. (2023) ‘Local rigidity by flexibility : unusual design for organic THz‐device materials’, Advanced Optical Materials, 11(21), p. 2300807. Available at: https://doi.org/10.1002/adom.202300807.

D.-J. Kim et al., “Local rigidity by flexibility : unusual design for organic THz‐device materials,” Advanced Optical Materials, vol. 11, no. 21, p. 2300807, Nov. 2023, doi: 10.1002/adom.202300807.

KIM, Dong‐Joo, In Cheol YU, Mojca JAZBINSEK, Chaeyoon KIM, Woojin YOON, Hoseop YUN, Sang‐Wook KIM, Dongwook KIM, Fabian ROTERMUND und O‐Pil KWON, 2023. Local rigidity by flexibility : unusual design for organic THz‐device materials. Advanced Optical Materials. 6 November 2023. Bd. 11, Nr. 21, S. 2300807. DOI 10.1002/adom.202300807

Kim, Dong‐Joo, In Cheol Yu, Mojca Jazbinsek, Chaeyoon Kim, Woojin Yoon, Hoseop Yun, Sang‐Wook Kim, Dongwook Kim, Fabian Rotermund, and O‐Pil Kwon. 2023. “Local Rigidity by Flexibility : Unusual Design for Organic THz‐Device Materials.” Advanced Optical Materials 11 (21): 2300807. https://doi.org/10.1002/adom.202300807.

Kim, Dong-Joo, et al. “Local Rigidity by Flexibility : Unusual Design for Organic THz‐Device Materials.” Advanced Optical Materials, vol. 11, no. 21, Nov. 2023, p. 2300807, https://doi.org/10.1002/adom.202300807.