High‐Density Organic Electro‐Optic Crystals for Ultra‐Broadband THz Spectroscopy. Issue 17 (4th June 2021)

• Record Type: Journal Article
• Authors: Seok, Jin‐Hong; Puc, Uros; Kim, Seung‐Jun; Yoon, Woojin; Yun, Hoseop; Yu, In Cheol; Rotermund, Fabian; Kim, Dongwook; Jazbinsek, Mojca; Kwon, O‐Pil
• Is Part Of: Advanced optical materials. Volume 9:Issue 17(2021)
• Page Start: n/a
• Page End: n/a
• Publication Date: 2021-06-04
• Subjects: electro‐optics -- nonlinear optics -- organic crystals -- terahertz waves; Optical materials -- Periodicals; Photonics -- Periodicals; 620.11295
• DOI: 10.1002/adom.202100618
• Languages: English
• ISSNs: 2195-1071

Abstract

Abstract: 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. Abstract : New high‐density organic electro‐optic crystals are developed for efficient ultra‐broadband THz wave generation up to about 15 THz. Using the newly developed crystals, ultra‐broadband all‐organic THz time‐domain spectroscopy is successfully demonstrated.