Please use this identifier to cite or link to this item: https://doi.org/10.21256/zhaw-21558
Publication type: Article in scientific journal
Type of review: Peer review (publication)
Title: Organic broadband THz generators optimized for efficient near‐infrared optical pumping
Authors: Shin, Myeong‐Hoon
Kim, Won Tae
Kim, Se‐In
Kim, Seung‐Jun
Yu, In Cheol
Kim, Sang‐Wook
Jazbinsek, Mojca
Yoon, Woojin
Yun, Hoseop
Rotermund, Fabian
Kwon, O‐Pil
et. al: No
DOI: 10.1002/advs.202001738
10.21256/zhaw-21558
Published in: Advanced Science
Volume(Issue): 7
Issue: 20
Pages: 2001738
Issue Date: 2020
Publisher / Ed. Institution: Wiley
ISSN: 2198-3844
Language: English
Subjects: Nonlinear optics; Organic crystals; Terahertz waves; THz photonics
Subject (DDC): 540: Chemistry
621.3: Electrical, communications, control engineering
Abstract: New organic THz generators are designed herein by molecular engineering of the refractive index, phonon mode, and spatial asymmetry. These benzothiazolium crystals simultaneously satisfy the crucial requirements for efficient THz wave generation, including having nonlinear optical chromophores with parallel alignment that provide large optical nonlinearity; good phase matching for enhancing the THz generation efficiency in the near-infrared region; strong intermolecular interactions that provide restraining THz self-absorption; high solubility that promotes good crystal growth ability; and a plate-like crystal morphology with excellent optical quality. Consequently, the as-grown benzothiazolium crystals exhibit excellent characteristics for THz wave generation, particularly at near-infrared pump wavelengths around 1100 nm, which is very promising given the availability of femtosecond laser sources at this wavelength, where current conventional THz generators deliver relatively low optical-to-THz conversion efficiencies. Compared to a 1.0-mm-thick ZnTe crystal as an inorganic benchmark, the 0.28-mm-thick benzothiazolium crystal yields a 19 times higher peak-to-peak THz electric field with a broader spectral bandwidth (>6.5 THz) when pumped at 1140 nm. The present work provides a valuable approach toward realizing organic crystals that can be pumped by near-infrared sources for efficient THz wave generation.
URI: https://digitalcollection.zhaw.ch/handle/11475/21558
Fulltext version: Published version
License (according to publishing contract): CC BY 4.0: Attribution 4.0 International
Departement: School of Engineering
Organisational Unit: Institute of Computational Physics (ICP)
Appears in collections:Publikationen School of Engineering

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