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Optics Letters

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  • Editor: Alan E. Willner
  • Vol. 34, Iss. 9 — May. 1, 2009
  • pp: 1411–1413

Tuning resonant optical transmission of metallic nanoslit arrays with embedded microcavities

Zhijun Sun and Xiaoliu Zuo  »View Author Affiliations


Optics Letters, Vol. 34, Issue 9, pp. 1411-1413 (2009)
http://dx.doi.org/10.1364/OL.34.001411


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Abstract

We numerically study the characteristics of optical transmission of metallic nanoslit arrays (MNSAs) with embedded microcavities (MC-MNSAs) and demonstrate that passbands of the transmission spectra can be monotonously tuned by adjusting the dimensions of the microcavities. The study discloses that spectra of conventional MNSAs and MC-MNSAs are determined mainly by cavity resonances of the slits or embedded microcavities, modified by in-plane surface-plasmon wave resonances. It is also found that coupling of cavity resonances between neighboring slits or microcavities has considerable effects on the passbands. The MC-MNSA structure is shown to have potentials in applications of tunable filter arrays.

© 2009 Optical Society of America

OCIS Codes
(120.2440) Instrumentation, measurement, and metrology : Filters
(240.6680) Optics at surfaces : Surface plasmons
(260.3910) Physical optics : Metal optics
(260.5740) Physical optics : Resonance

ToC Category:
Physical Optics

History
Original Manuscript: November 26, 2008
Revised Manuscript: February 24, 2009
Manuscript Accepted: March 20, 2009
Published: April 24, 2009

Citation
Zhijun Sun and Xiaoliu Zuo, "Tuning resonant optical transmission of metallic nanoslit arrays with embedded microcavities," Opt. Lett. 34, 1411-1413 (2009)
http://www.opticsinfobase.org/ol/abstract.cfm?URI=ol-34-9-1411


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References

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  10. The numerical calculations were performed with the software FullWAVEtrade (ver. 6.0, RSoft Design Group, Inc.), which is based on the finite-difference time-domain method. In simulations, the periodic boundary conditions were applied in the periodic direction (x direction), and perfect-matching layer boundary conditions were applied in nonperiodic directions (x and/or z direction). Permittivity of silver is defined in the software as a sum of Lorenzian functions: ε(ω)=ε∞+∑kΔεk/[ak(iω)2−bk(iω)+ck], where ε∞ is the value of permittivity in the limit of infinite frequency ω (unit, rad/μm), Δεk is the strength of each resonance, and ak, bk, and ck are fitting coefficients.
  11. The cavity intensity is calculated as the field intensity ∣Hy∣2 integrated over the area of the monitor located in the cavity.

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