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J. Appl. Phys. 109, 054903 (2011); http://dx.doi.org/10.1063/1.3553441 (5 pages)

Terahertz localized surface plasmon resonance of periodic silicon microring arrays

J. Grant1, X. Shi1,2, J. Alton3, and D. R. S. Cumming1

1Department of Electronics and Electrical Engineering, University of Glasgow, Glasgow, G12 8LT, United Kingdom
2Zeeko, 4 Vulcan Court, Vulcan Way, Coalville, LE67 3FW, United Kingdom
3Teraview Ltd., Platinum Building, St John’s Innovation Park, Cowley Road, Cambridge, CB4 0WS, United Kingdom

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(Received 2 November 2010; accepted 6 January 2011; published online 3 March 2011)

We demonstrate the absorption characteristics of silicon microring resonators at terahertz frequencies. Simulation and experimental data show a dipolar localized surface plasmon resonance (DLSPR) absorption peak. We demonstrate that the frequency position and magnitude of the DLSPR peak may be tuned by varying the geometry and thickness of the microring or by modification of the silicon impurity concentration. Finite difference time domain simulations reveal that there is a strong enhancement of the electric field at the resonant frequency. The absorption properties of our resonator are described in terms of effective optical constants and reveal that the silicon microring is an electric resonator. Surface plasmon resonators are efficient terahertz absorbers and have potential applications in security imaging, biological analysis, spectroscopy and nondestructive testing.

© 2011 American Institute of Physics

Article Outline

  1. INTRODUCTION
  2. THEORY
  3. SIMULATION AND EXPERIMENTAL TECHNIQUES
  4. RESULTS AND DISCUSSION
  5. CONCLUSIONS

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KEYWORDS and PACS

PACS

  • 73.20.Mf

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

  • 61.72.S-

    Impurities in crystals

  • 84.40.-x

    Radiowave and microwave (including millimeter wave) technology

  • 85.50.-n

    Dielectric, ferroelectric, and piezoelectric devices

  • 73.22.Lp

    Collective excitations

  • 78.20.Ci

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

ARTICLE DATA

PUBLICATION DATA

ISSN

0021-8979 (print)  
1089-7550 (online)

For access to fully linked references, you need to log in.
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