Third‐order nonlinear optical properties and two‐photon absorption in polymers doped with p‐phenyl sydnone

Abstract

ABSTRACT:We report the measurements of the thirdorder susceptibilities and two-photon absorption in three different polymers doped with p-phenyl sydnone moiety viz., 2-benzylhydrazono-5-(3-p-tolylsydnone-4-yl)1,3,4,-thiadiazine, which is recently synthesized and characterized, with the prospective of reaching a good compromise between processability and high nonlinear optical properties. The measurements were done using nano second Z-scan at 532 nm. The Z-scan spectra reveal a large negative nonlinear refraction coefficient n 2 of the order 10 214 cm 2 /W and a two-photon absorption b, which is determined to be the order of cm/GW. The absorption cross section is 10 246 cm 4 s/photon. The molecular second-order hyperpolarizability in PMMA matrix was calculated to be 1.47 3 10 231 esu, comparable with stilbazolieum derivatives, a well-known class of optical materials for photonics and biophotonics applications. The chromophore shows its optical power limiting behavior in all the three polymer matrices. All these results suggest that this moiety has potential for the application of all-optical limiting and switching devices.

Effect of poly(thiophene)s topology on their third-order nonlinear optical response

“…CPs -and certainly PTspossess an extended π-system with a high density of very polarizable π-electrons which features inherently a large TONO response. 29,30 Besides, the TONO response intrinsically relies on the molecular second hyperpolarizability γ, which is a fourth rank tensor with 81 tensor components. 31 The number of non-zero tensor components determines the TONO response and depends, among other things, on the topology.…”

The Importance of Excellent π–π Interactions in Poly(thiophene)s To Reach a High Third-Order Nonlinear Optical Response

“…Materials with a high third-order nonlinear optical (TONO) response are in high demand since they are very promising candidates to be used in optical network components like, e.g., all-optical switches. − Operating in the all-optical domain allows for fast communication, essential to meet the increasing bandwidth requirements in optical fibers. − These optical network components can become feasible if a material with a high TONO response is achieved. One promising class of TONO materials is conjugated polymers (CPs). − Due to their extended π-system, a high TONO response is inherently present but is not yet optimized enough for applications. , In addition, CPs can be synthesized via a controlled polymerization and structural modifications are easy to control and implement. Therefore, a systematic study on CPs can be performed, which opens up the possibility to investigate which structure gives the highest TONO response with a view on realizing applications.…”

“…7−10 Due to their extended π-system, a high TONO response is inherently present but is not yet optimized enough for applications. 11,12 In addition, CPs can be synthesized via a controlled polymerization and structural modifications are easy to control and implement. Therefore, a systematic study on CPs can be performed, which opens up the possibility to investigate which structure gives the highest TONO response with a view on realizing applications.…”