| Full text | |
| Author(s): Show less - |
Maldonado, Melissa
[1]
;
da Silva Neto, Manoel L.
[2]
;
Vianna, Pilar G.
[3]
;
Ribeiro, Henrique B.
[3]
;
Gordo, Vanessa O.
[3]
;
Carvalho, Isabel C. S.
[4]
;
Menezes, Leonardo de S.
[1]
;
de Araujo, Cid B.
[1, 2]
;
de Matos, Christiano J. S.
[3]
;
Seixas, Leandro
[3]
;
Jawaid, Ali M.
[5]
;
Busch, Robert
[5]
;
Ritter, Allyson J.
[5]
;
Vaia, Richard A.
[5]
;
Gomes, Anderson S. L.
[1]
Total Authors: 15
|
| Affiliation: | [1] Univ Fed Pernambuco, Phys Dept, BR-50670901 Recife, PE - Brazil
[2] Univ Fed Pernambuco, Grad Program Mat Sci, BR-50670901 Recife, PE - Brazil
[3] Univ Presbiteriana Mackenzie, MackGraphe, BR-01302907 Sao Paulo, SP - Brazil
[4] Pontificia Univ Catolica Rio de Janeiro, Dept Phys, BR-22451900 Rio De Janeiro, RJ - Brazil
[5] Air Force Res Labs, Mat & Mfg Directorate, Wright Patterson AFB, OH 45433 - USA
Total Affiliations: 5
|
| Document type: | Journal article |
| Source: | Journal of Physical Chemistry C; v. 124, n. 28, p. 15425-15433, JUL 16 2020. |
| Web of Science Citations: | 0 |
| Abstract | |
The understanding of the nonlinear optical (NLO) properties of photonic materials is relevant and necessary for basic studies and technological developments. Among the materials with high optical nonlinearities, layered transition-metal dichalcogenides (LTMDs) have attracted considerable attention from the viewpoint of both synthesis as well as characterization and applications. We report here the third-order NLO properties of one LTMD-the metallic NbS2-that was prepared by a modified redox exfoliated method, suspended in acetonitrile. The LTMD was morphologically and compositionally characterized using transmission electron microscopy, atomic force microscopy, X-ray diffraction, Raman scattering, and linear absorption. The Z-scan technique was employed to characterize the nonlinear refraction (NLR) and nonlinear absorption (NLA) behavior in the femtosecond regime. Metallic NbS2 presented a sign inversion of the nonlinear refractive index from negative (self-defocusing) to positive (self-focusing) with the increase of intensity up to 100 GW/cm(2). Two distinct features characteristic of NLA, two-photon absorption and saturated absorption, were also observed for different intensity ranges, with the former evolving into the latter as the intensity increased in the same range as for the NLR measurements. The material's band structure of NbS2 was calculated using the density functional theory, and the origin of the nonlinearities is discussed by comparison with the experimental data. (AU) | |
| FAPESP's process: | 17/20100-0 - Spectroscopy of excitonic and many body effects in two-dimensional materials |
| Grantee: | Henrique Bücker Ribeiro |
| Support Opportunities: | Scholarships in Brazil - Post-Doctoral |
| FAPESP's process: | 12/50259-8 - Graphene: photonics and opto-electronics: UPM-NUS collaboration |
| Grantee: | Antonio Helio de Castro Neto |
| Support Opportunities: | Research Projects - SPEC Program |
| FAPESP's process: | 15/11779-4 - Plasmonic and nonlinear effects in graphene coupled to optical waveguides |
| Grantee: | Christiano José Santiago de Matos |
| Support Opportunities: | Research Projects - Thematic Grants |
| FAPESP's process: | 18/04926-9 - Spectroscopy of excitonic and many-body effects in two-dimensional materials |
| Grantee: | Henrique Bücker Ribeiro |
| Support Opportunities: | Scholarships abroad - Research Internship - Post-doctor |