Nonlinear Optical Properties of Pyrene Derivatives Based on a Donor–Acceptor Structure and Its Polyurethane Composites

Abstract

Two pyrenyl Schiff base derivatives with π conjugated structures ( B2 and B3 ) were designed and synthesized. Then, B2 and B3 were added into polyurethane to obtain doped and bonded polyurethane nonlinear optical materials ( B2 /PU and B3 /PU), respectively. The synthesized B2 , B3 , and polyurethane nonlinear optical materials were tested by a nanosecond (ns) and picosecond (ps) pulse Z -scan at a 532 nm wavelength. Due to the two-photon absorption-induced excited state absorption (TPA-ESA), B2 , B3 , and polyurethane nonlinear optical materials show reverse saturable absorption (RSA). From a quantum chemistry calculation, it can be concluded that the RSA of B2 and B3 comes from the large π conjugated system and intramolecular charge transfer. Furthermore, B2 , B3 , and the polyurethane nonlinear optical materials show good optical limiting. B2 /PU and B3 /PU not only have excellent nonlinear optical properties but also have good transmittance, thermal stability, and processability of polyurethane materials. The combination of pyrenyl Schiff base derivatives and polyurethane materials greatly improves the application of nonlinear small molecules in the field of optical limiting and all-optical switching.

The Comparative Third‐Order Nonlinearities of Titanium Carbide and Tungsten Carbide in the Visible Regain

“…Lastly, the powder was dried in a vacuum oven for the duration of 12 h at a temperature of 60 °C. [ 1 ]…”

“…Lastly, the powder was dried in a vacuum oven for the duration of 12 h at a temperature of 60 °C. [1] Titanium oxide purchased from Merck was mixed with carbon black in a high-density polyethylene jar. The powder mixture underwent ball milling for a duration of 2 h. It was then transferred into an alumina crucible and placed inside the graphite chamber of a brazing furnace.…”

“…These phenomena play a significant role in various applications such as ultrafast photonics. [1] Particularly, materials with strong second-and third-order nonlinearities have a profound impact on optical information DOI: 10.1002/crat.202300220 technology, optical sensing, and optoelectronic devices. [2] Despite the availability of alternative materials for nonlinear optical devices, researchers are continuously searching for easily synthesized materials that offer enhanced optical nonlinearity.…”

Systematic Study on Nonlinear Optical Chromophores with Improved Electro-Optic Activity by Introducing 3,5-Bis(trifluoromethyl)benzene Derivative Isolation Groups into the Bridge

“…The introduction of some isolation groups (IG) into the chromophore moieties should be an efficient approach to decrease the interactions between chromophores and to enhance the nonlinear optical properties and the poling efficiency of organic electro-optic polymer materials [ 30 , 31 , 32 ]. These chromophores improve the application of nonlinear small molecules in the field of optical limiting and all-optical switching [ 33 ]. Future perspectives of the application of these kinds of NLO chromophores should be considered.…”

Physicochemical and Nonlinear Optical Properties of a Stilbazolium Family Single Crystal with Third Order Nonlinear Optical Activity

“…Since the birth of NLO materials, inorganic class NLO materials (KTP, KDP, Borates, Phosphates, etc.) have been explored more for a period because of their advantages, like high‐frequency conversion rate and good chemical stability [7–10] . However, inorganic material consists of certain drawbacks, including low nonlinearity, low laser damage threshold and difficulties in device fabrication [11] .…”