Ultrafast and large third-order nonlinear optical properties of CdS nanocrystals in polymeric film

J. He; W. Ji; G. H. Ma; S. H. Tang; E. S.W. Kong; S. Y. Chow; X. H. Zhang; Z. L. Hua; J. L. Shi

doi:10.1021/jp047787q

Ultrafast and large third-order nonlinear optical properties of CdS nanocrystals in polymeric film

J. He
, W. Ji^*
, G. H. Ma
, S. H. Tang
, E. S.W. Kong
, S. Y. Chow
, X. H. Zhang
, Z. L. Hua
, J. L. Shi

^*Corresponding author for this work

National University of Singapore
Nanophotonic Semiconductors
Agency for Science, Technology and Research, Singapore
CAS - Shanghai Institute of Ceramics

Research output: Contribution to journal › Article › peer-review

67 Scopus citations

Abstract

We report the ultrafast and large third-order nonlinear optical properties of CdS nanocrystals (NCs) embedded in a polymeric film. The CdS NCs of 2 nm radius are synthesized by an ion-exchange method and highly concentrated in the two layers near the surfaces of the polymeric film. The two-photon absorption coefficient and the optical Kerr coefficient are measured with laser pulses of 250 fs duration at 800 nm wavelength. The one-photon and two-photon figures of merit are determined to be 3.1 and 1.3, respectively, at irradiance of 2 GW/cm². The observed nonlinearities have a recovery time of ∼1 ps. The two-photon-generated free carrier effects have also been observed and discussed. These results demonstrate that CdS NCs embedded in polymeric film are a promising candidate for optical switching applications.

Original language	English
Pages (from-to)	4373-4376
Number of pages	4
Journal	Journal of Physical Chemistry B
Volume	109
Issue number	10
DOIs	https://doi.org/10.1021/jp047787q
State	Published - 17 Mar 2005
Externally published	Yes

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title = "Ultrafast and large third-order nonlinear optical properties of CdS nanocrystals in polymeric film",

abstract = "We report the ultrafast and large third-order nonlinear optical properties of CdS nanocrystals (NCs) embedded in a polymeric film. The CdS NCs of 2 nm radius are synthesized by an ion-exchange method and highly concentrated in the two layers near the surfaces of the polymeric film. The two-photon absorption coefficient and the optical Kerr coefficient are measured with laser pulses of 250 fs duration at 800 nm wavelength. The one-photon and two-photon figures of merit are determined to be 3.1 and 1.3, respectively, at irradiance of 2 GW/cm2. The observed nonlinearities have a recovery time of ∼1 ps. The two-photon-generated free carrier effects have also been observed and discussed. These results demonstrate that CdS NCs embedded in polymeric film are a promising candidate for optical switching applications.",

author = "J. He and W. Ji and Ma, \{G. H.\} and Tang, \{S. H.\} and Kong, \{E. S.W.\} and Chow, \{S. Y.\} and Zhang, \{X. H.\} and Hua, \{Z. L.\} and Shi, \{J. L.\}",

year = "2005",

month = mar,

day = "17",

doi = "10.1021/jp047787q",

language = "英语",

volume = "109",

pages = "4373--4376",

journal = "Journal of Physical Chemistry B",

issn = "1520-6106",

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TY - JOUR

T1 - Ultrafast and large third-order nonlinear optical properties of CdS nanocrystals in polymeric film

AU - He, J.

AU - Ji, W.

AU - Ma, G. H.

AU - Tang, S. H.

AU - Kong, E. S.W.

AU - Chow, S. Y.

AU - Zhang, X. H.

AU - Hua, Z. L.

AU - Shi, J. L.

PY - 2005/3/17

Y1 - 2005/3/17

N2 - We report the ultrafast and large third-order nonlinear optical properties of CdS nanocrystals (NCs) embedded in a polymeric film. The CdS NCs of 2 nm radius are synthesized by an ion-exchange method and highly concentrated in the two layers near the surfaces of the polymeric film. The two-photon absorption coefficient and the optical Kerr coefficient are measured with laser pulses of 250 fs duration at 800 nm wavelength. The one-photon and two-photon figures of merit are determined to be 3.1 and 1.3, respectively, at irradiance of 2 GW/cm2. The observed nonlinearities have a recovery time of ∼1 ps. The two-photon-generated free carrier effects have also been observed and discussed. These results demonstrate that CdS NCs embedded in polymeric film are a promising candidate for optical switching applications.

AB - We report the ultrafast and large third-order nonlinear optical properties of CdS nanocrystals (NCs) embedded in a polymeric film. The CdS NCs of 2 nm radius are synthesized by an ion-exchange method and highly concentrated in the two layers near the surfaces of the polymeric film. The two-photon absorption coefficient and the optical Kerr coefficient are measured with laser pulses of 250 fs duration at 800 nm wavelength. The one-photon and two-photon figures of merit are determined to be 3.1 and 1.3, respectively, at irradiance of 2 GW/cm2. The observed nonlinearities have a recovery time of ∼1 ps. The two-photon-generated free carrier effects have also been observed and discussed. These results demonstrate that CdS NCs embedded in polymeric film are a promising candidate for optical switching applications.

UR - https://www.scopus.com/pages/publications/15944388919

U2 - 10.1021/jp047787q

DO - 10.1021/jp047787q

M3 - 文章

AN - SCOPUS:15944388919

SN - 1520-6106

VL - 109

SP - 4373

EP - 4376

JO - Journal of Physical Chemistry B

JF - Journal of Physical Chemistry B

IS - 10

ER -

Ultrafast and large third-order nonlinear optical properties of CdS nanocrystals in polymeric film

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