Fluorescence enhancement of quantum dots enclosed in Au nanopockets with subwavelength aperture

Gang L. Liu; Jaeyoun Kim; Yu Lu; Luke P. Lee

doi:10.1063/1.2388870

Fluorescence enhancement of quantum dots enclosed in Au nanopockets with subwavelength aperture

Gang L. Liu, Jaeyoun Kim, Yu Lu, Luke P. Lee

Department of Chemistry & Nanoscience

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

26 Scopus citations

Abstract

The authors observed strong fluorescence (FL) enhancement from CdSe quantum dots (QDs) partially encapsulated in a smooth Au film with subwavelength apertures. So far, the fluorescence of QDs placed on smooth metallic surfaces has been mostly quenched unless the surface was roughened in nanoscale. The pocketed QD FL emitted through the nanoaperture exhibited up to fivefold enhancement when compared with those from QDs on plain Au or glass surfaces. The enhancement depends strongly on the film thickness and becomes maximized at 50 nm. This study shows that the dependence may be closely related to the surface plasmon-polariton characteristics of the Au layer.

Original language	English
Article number	241118
Journal	Applied Physics Letters
Volume	89
Issue number	24
DOIs	https://doi.org/10.1063/1.2388870
State	Published - 2006

Bibliographical note

Funding Information:
One of the authors was supported by a grant (Code No. 05K1501-02810) from “Center for Nanostructured Materials Technology” under “21st Century Frontier R&D Programs” of the Ministry of Science and Technology, Korea. The authors also appreciate the support from DARPA.

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title = "Fluorescence enhancement of quantum dots enclosed in Au nanopockets with subwavelength aperture",

abstract = "The authors observed strong fluorescence (FL) enhancement from CdSe quantum dots (QDs) partially encapsulated in a smooth Au film with subwavelength apertures. So far, the fluorescence of QDs placed on smooth metallic surfaces has been mostly quenched unless the surface was roughened in nanoscale. The pocketed QD FL emitted through the nanoaperture exhibited up to fivefold enhancement when compared with those from QDs on plain Au or glass surfaces. The enhancement depends strongly on the film thickness and becomes maximized at 50 nm. This study shows that the dependence may be closely related to the surface plasmon-polariton characteristics of the Au layer.",

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note = "Funding Information: One of the authors was supported by a grant (Code No. 05K1501-02810) from “Center for Nanostructured Materials Technology” under “21st Century Frontier R&D Programs” of the Ministry of Science and Technology, Korea. The authors also appreciate the support from DARPA.",

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AU - Liu, Gang L.

AU - Kim, Jaeyoun

AU - Lu, Yu

AU - Lee, Luke P.

N1 - Funding Information: One of the authors was supported by a grant (Code No. 05K1501-02810) from “Center for Nanostructured Materials Technology” under “21st Century Frontier R&D Programs” of the Ministry of Science and Technology, Korea. The authors also appreciate the support from DARPA.

PY - 2006

Y1 - 2006

N2 - The authors observed strong fluorescence (FL) enhancement from CdSe quantum dots (QDs) partially encapsulated in a smooth Au film with subwavelength apertures. So far, the fluorescence of QDs placed on smooth metallic surfaces has been mostly quenched unless the surface was roughened in nanoscale. The pocketed QD FL emitted through the nanoaperture exhibited up to fivefold enhancement when compared with those from QDs on plain Au or glass surfaces. The enhancement depends strongly on the film thickness and becomes maximized at 50 nm. This study shows that the dependence may be closely related to the surface plasmon-polariton characteristics of the Au layer.

AB - The authors observed strong fluorescence (FL) enhancement from CdSe quantum dots (QDs) partially encapsulated in a smooth Au film with subwavelength apertures. So far, the fluorescence of QDs placed on smooth metallic surfaces has been mostly quenched unless the surface was roughened in nanoscale. The pocketed QD FL emitted through the nanoaperture exhibited up to fivefold enhancement when compared with those from QDs on plain Au or glass surfaces. The enhancement depends strongly on the film thickness and becomes maximized at 50 nm. This study shows that the dependence may be closely related to the surface plasmon-polariton characteristics of the Au layer.

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JO - Applied Physics Letters

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Fluorescence enhancement of quantum dots enclosed in Au nanopockets with subwavelength aperture

Abstract

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