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Applied Physics Letters / Volume 86 / Issue 6 / NANOSCALE SCIENCE AND DESIGN

Appl. Phys. Lett. 86, 063106 (2005); http://dx.doi.org/10.1063/1.1855423 (3 pages)

Enhanced semiconductor optical absorption via surface plasmon excitation in metal nanoparticles

D. M. Schaadt, B. Feng, and E. T. Yu

Department of Electrical and Computer Engineering, University of California, San Diego, La Jolla, California 92093-0407

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(Received 30 July 2004; accepted 29 November 2004; published online 2 February 2005)

Surface plasmon resonances in metallic nanoparticles are of interest for a variety of applications due to the large electromagnetic field enhancement that occurs in the vicinity of the metal surface, and the dependence of the resonance wavelength on the nanoparticle’s size, shape, and local dielectric environment. Here we report an engineered enhancement of optical absorption and photocurrent in a semiconductor via the excitation of surface plasmon resonances in spherical Au nanoparticles deposited on the semiconductor surface. The enhancement in absorption within the semiconductor results in increased photocurrent response in Si pn junction diodes over wavelength ranges that correspond closely to the nanoparticle plasmon resonance wavelengths as determined by measurements of extinction spectra. These observations suggest a variety of approaches for improving the performance of devices such as photodetectors, imaging arrays, and photovoltaics.

© 2005 American Institute of Physics

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KEYWORDS and PACS

Keywords

silicon, gold, elemental semiconductors, nanoparticles, semiconductor diodes, semiconductor-metal boundaries, surface plasmon resonance, particle size, photoconductivity, ultraviolet spectra, extinction coefficients

PACS

  • 78.68.+m

    Optical properties of surfaces

  • 73.20.Mf

    Collective excitations (including excitons, polarons, plasmons and other charge-density excitations)

  • 85.30.Kk

    Junction diodes

  • 72.40.+w

    Photoconduction and photovoltaic effects

  • 73.22.Lp

    Collective excitations

  • 78.67.Bf

    Nanocrystals, nanoparticles, and nanoclusters

  • 78.20.Ci

    Optical constants (including refractive index, complex dielectric constant, absorption, reflection and transmission coefficients, emissivity)

  • 78.40.Kc

    Metals, semimetals, and alloys

  • 61.46.-w

    Structure of nanoscale materials

ARTICLE DATA

Digital Object Identifier
http://dx.doi.org/10.1063/1.1855423

PUBLICATION DATA

ISSN

0003-6951 (print)  
1077-3118 (online)

Publisher

$abstract.society.value is a Member of CrossRef American Institute of Physics

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    References

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