Third-order optical nonlinearities in thin films of CdS nanocrystals

• Tipo: Artigo em Revista Científica Internacional
• Data: 2001

Autores

Rakovich, YP (Autor) Outra; Artemyev, MV (Autor) Outra; Rolo, AG (Autor) Outra; Vasilevskiy, MI (Autor) Outra; Gomes, MJM (Autor) Outra

Revista

Título: Physica Status Solidi (B): Basic Research

Vol. 224

Páginas: 319-324

ISSN: 0370-1972

Editora: Wiley-Blackwell

Indexação

ISI Web of Knowledge - 26 Citações

Scopus - 32 Citações

Outras Informações

ID Authenticus: P-000-WAP

DOI: 10.1002/1521-3951(200103)224:1<319::aid-pssb319>3.0.co;2-o

Abstract (EN): The non-resonant nonlinear optical properties of CdS nanocrystals (NCs) embedded in silica (i) and forming matrix-free (MF) almost close-packed films (ii) were studied using the Z-scan technique. Among the group (i), samples containing NCs covered with a HgS and CuS shell were investigated. The highest value of the nonlinear refractive index n(2) = 1.85 x 10(-6) cm(2)/W was measured for the MF films. This number exceeds by far the value typical for bulk CdS and cannot be explained in terms of thermally induced nonlinearity. Strong enhancement of local fluctuations of the electro-magnetic field in MF films where NCs form aggregatzs or clusters is suggested to explain this result. Within the group (ii), an enhancement of the nonlinearity was observed under pulsed irradiation for both CdS/HgS and CdS/CuS nanoparticles. compared to CdS NCs without a shell.

Idioma: Inglês

Tipo (Avaliação Docente): Científica

Nº de páginas: 6