Third-order optical nonlinearities in thin films of CdS nanocrystals

Yu P. Rakovich; M. V. Artemyev; A. G. Rolo; M. I. Vasilevskiy; M. J M Gomes

doi:10.1002/1521-3951(200103)224:1<319::AID-PSSB319>3.0.CO;2-O

Third-order optical nonlinearities in thin films of CdS nanocrystals

Yu P. Rakovich
, M. V. Artemyev
, A. G. Rolo
, M. I. Vasilevskiy
, M. J M Gomes

Research output: Journal Publications and Reviews › RGC 21 - Publication in refereed journal › peer-review

33 Citations (Scopus)

Abstract

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 n₂ = 1.85 × 10^-6 cm²/W was measured for the MF films. This number exceeds by far the value typical tor bulk CdS and cannot be explained in terms of thermally induced nonlinearity. Strong enhancemem of local fiuctuations of the electro-magnetic field in MF films where NCs form aggregates 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.

Original language	English
Pages (from-to)	319-324
Journal	Physica Status Solidi (B) Basic Research
Volume	224
Issue number	1
DOIs	https://doi.org/10.1002/1521-3951(200103)224:1<319::AID-PSSB319>3.0.CO;2-O
Publication status	Published - Mar 2001
Externally published	Yes

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title = "Third-order optical nonlinearities in thin films of CdS nanocrystals",

abstract = "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 n2 = 1.85 × 10-6 cm2/W was measured for the MF films. This number exceeds by far the value typical tor bulk CdS and cannot be explained in terms of thermally induced nonlinearity. Strong enhancemem of local fiuctuations of the electro-magnetic field in MF films where NCs form aggregates 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.",

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year = "2001",

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journal = "Physica Status Solidi (B) Basic Research",

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TY - JOUR

T1 - Third-order optical nonlinearities in thin films of CdS nanocrystals

AU - Rakovich, Yu P.

AU - Artemyev, M. V.

AU - Rolo, A. G.

AU - Vasilevskiy, M. I.

AU - Gomes, M. J M

PY - 2001/3

Y1 - 2001/3

N2 - 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 n2 = 1.85 × 10-6 cm2/W was measured for the MF films. This number exceeds by far the value typical tor bulk CdS and cannot be explained in terms of thermally induced nonlinearity. Strong enhancemem of local fiuctuations of the electro-magnetic field in MF films where NCs form aggregates 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.

AB - 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 n2 = 1.85 × 10-6 cm2/W was measured for the MF films. This number exceeds by far the value typical tor bulk CdS and cannot be explained in terms of thermally induced nonlinearity. Strong enhancemem of local fiuctuations of the electro-magnetic field in MF films where NCs form aggregates 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.

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U2 - 10.1002/1521-3951(200103)224:1<319::AID-PSSB319>3.0.CO;2-O

DO - 10.1002/1521-3951(200103)224:1<319::AID-PSSB319>3.0.CO;2-O

M3 - RGC 21 - Publication in refereed journal

SN - 0370-1972

VL - 224

SP - 319

EP - 324

JO - Physica Status Solidi (B) Basic Research

JF - Physica Status Solidi (B) Basic Research

IS - 1

ER -

Third-order optical nonlinearities in thin films of CdS nanocrystals

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