Preprint Article Version 1 Preserved in Portico This version is not peer-reviewed

Investigation of Broadband Optical Nonlinear Absorption and Transient Dynamics in Orange IV Containing Azobenzene

Quanhua Wu
,
Rui Ruan
,
Xingxing Li
,
Yujie Zhao
,
Yang Li
ORCID logo ,
Yu Fang
,
Yongqiang Chen
ORCID logo ,
Quanying Wu
,
Yinglin Song
* ,
Xingzhi Wu
*
Version 1 : Received: 24 April 2023 / Approved: 25 April 2023 / Online: 25 April 2023 (05:40:29 CEST)

A peer-reviewed article of this Preprint also exists.

Wu, Q.; Ruan, R.; Li, X.; Zhao, Y.; Li, Y.; Fang, Y.; Chen, Y.; Wu, Q.; Song, Y.; Wu, X. Investigation of Broadband Optical Nonlinear Absorption and Transient Dynamics in Orange IV Containing Azobenzene. Molecules 2023, 28, 4692. Wu, Q.; Ruan, R.; Li, X.; Zhao, Y.; Li, Y.; Fang, Y.; Chen, Y.; Wu, Q.; Song, Y.; Wu, X. Investigation of Broadband Optical Nonlinear Absorption and Transient Dynamics in Orange IV Containing Azobenzene. Molecules 2023, 28, 4692.

Abstract

Broadband reverse saturable absorption is systematically investigated via Z-scan, transient absorption spectrum (TAS). The excited state absorption and negative refraction of Orange IV are observed in the Z-scan experiment at 532 nm. Meanwhile, two-photon induced excited-state absorption and pure two-photon absorption are observed at 600 nm and 700 nm with the pulse width of 190 fs, respectively. An ultrafast broadband absorption in visible wavelength region is observed via TAS. The different nonlinear absorption mechanism at multiple wavelengths is discussed and interpreted from the results of TAS. In addition, the ultrafast dynamics of negative refraction in the excited state of Orange IV is investigated via degenerate phase object pump probe, from which the weak long-lived excited state is extracted. All studies indicate that Orange IV has the potential to be further optimized into a superior broadband reverse saturable absorption material and also has certain reference significance for the study of optical nonlinearity in organic molecules containing azobenzene groups.

Keywords

Nonlinear optics; Z-scan; Transient absorption and refraction; Pump probe

Subject

Physical Sciences, Optics and Photonics

Copyright: This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

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