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Optics Letters

Optics Letters

| RAPID, SHORT PUBLICATIONS ON THE LATEST IN OPTICAL DISCOVERIES

  • Editor: Xi-Cheng Zhang
  • Vol. 39, Iss. 13 — Jul. 1, 2014
  • pp: 4057–4060

Experimental demonstration of sharp Fano resonance in optical metamaterials composed of asymmetric double bars

Yuto Moritake, Yoshiaki Kanamori, and Kazuhiro Hane  »View Author Affiliations


Optics Letters, Vol. 39, Issue 13, pp. 4057-4060 (2014)
http://dx.doi.org/10.1364/OL.39.004057


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Abstract

We experimentally demonstrated Fano resonance in metamaterials composed of asymmetric double bars (ADBs) in the optical region. ADB metamaterials were fabricated by a lift-off method, and the optical spectra were measured. Around a wavelength of 1100 nm, measured optical spectra clearly showed sharp Fano resonance due to weak asymmetry of the ADB structures. The highest-quality factor (Q-factor) of the Fano resonance was 7.34. Calculated spectra showed the same tendency as the experimental spectra. Moreover, in a Fano resonant condition, out of phase of induced current flowing along each bar was revealed by electromagnetic field calculations. These antiphase currents decreased radiative loss of the Fano mode, resulting in a high Q-factor of the Fano resonance in ADB metamaterials. As the degree of asymmetry became small, the Q-factor decreased, and the Fano resonance disappeared because the effect of Joule loss became significant.

© 2014 Optical Society of America

OCIS Codes
(070.4790) Fourier optics and signal processing : Spectrum analysis
(260.2110) Physical optics : Electromagnetic optics
(160.3918) Materials : Metamaterials
(220.4241) Optical design and fabrication : Nanostructure fabrication
(050.6624) Diffraction and gratings : Subwavelength structures

ToC Category:
Materials

History
Original Manuscript: April 3, 2014
Revised Manuscript: June 4, 2014
Manuscript Accepted: June 8, 2014
Published: June 30, 2014

Citation
Yuto Moritake, Yoshiaki Kanamori, and Kazuhiro Hane, "Experimental demonstration of sharp Fano resonance in optical metamaterials composed of asymmetric double bars," Opt. Lett. 39, 4057-4060 (2014)
http://www.opticsinfobase.org/ol/abstract.cfm?URI=ol-39-13-4057

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