Premium
High‐Density Organic Electro‐Optic Crystals for Ultra‐Broadband THz Spectroscopy
Author(s) -
Seok JinHong,
Puc Uros,
Kim SeungJun,
Yoon Woojin,
Yun Hoseop,
Yu In Cheol,
Rotermund Fabian,
Kim Dongwook,
Jazbinsek Mojca,
Kwon OPil
Publication year - 2021
Publication title -
advanced optical materials
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 2.89
H-Index - 91
ISSN - 2195-1071
DOI - 10.1002/adom.202100618
Subject(s) - terahertz radiation , materials science , optoelectronics , broadband , optical rectification , spectroscopy , terahertz spectroscopy and technology , laser , spectrometer , optics , photonics , nonlinear optics , physics , quantum mechanics
Ultra‐broadband THz photonics covering the 0.3–20 THz range provides a very attractive foundation for a wide range of basic research and industrial applications. However, the lack of ultra‐broadband THz devices has yet to be overcome. In this work, high‐density organic electro‐optic crystals are newly developed for efficient THz wave generation in a very broad THz spectral range and are successfully used for a broadband THz time‐domain spectroscopy. The new organic THz generator crystals, namely the OHP‐TFS crystals, have very low void volume, high density, and are shown to cover the ultra‐broadband THz spectrum up to about 15 THz, which cannot be easily accessed with the more widely used inorganic‐based THz generators. In addition to the very favorable broadband properties, the generated THz electric‐field amplitude at the pump wavelength of 1560 nm is about 40 times higher than that generated by a commercial inorganic THz generator (ZnTe crystal). By using the newly developed OHP‐TFS as generation crystal in a compact table‐top all‐organic THz time‐domain spectrometer based on a low‐cost telecom fiber laser, the optical characteristics of a model material are successfully determined in the broad 1.5–12.5 THz range with high accuracy.