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Optics Express

Optics Express

  • Editor: C. Martijn de Sterke
  • Vol. 16, Iss. 14 — Jul. 7, 2008
  • pp: 10701–10709

Bimetallic structure fabricated by laser interference lithography for tuning surface plasmon resonance

C. H. Liu, M. H. Hong, H. W. Cheung, F. Zhang, Z. Q. Huang, L. S. Tan, and T. S. A. Hor  »View Author Affiliations

Optics Express, Vol. 16, Issue 14, pp. 10701-10709 (2008)

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Tuning of surface plasmon resonance by gold and silver bimetallic thin film and bimetallic dot array is investigated. Laser interference lithography is applied to fabricate the nanostructures. A bimetallic dot structure is obtained by a lift-off procedure after gold and silver thin film deposition by an electron beam evaporator. Surface plasmon behaviors of these films and nanostructures are studied using UV-Vis spectroscopy. It is observed that for gold thin film on quartz substrate, the optical spectral peak is blue shifted when a silver thin film is coated over it. Compared to the plasmon band in single metal gold dot array, the bimetallic nanodot array shows a similar blue shift in its spectral peak. These shifts are both attributed to the interaction between gold and silver atoms. Electromagnetic interaction between gold and silver nanostructures is discussed using a simplified spring model.

© 2008 Optical Society of America

OCIS Codes
(220.3740) Optical design and fabrication : Lithography
(240.6680) Optics at surfaces : Surface plasmons
(310.6870) Thin films : Thin films, other properties
(050.6624) Diffraction and gratings : Subwavelength structures

ToC Category:
Optics at Surfaces

Original Manuscript: May 2, 2008
Revised Manuscript: June 11, 2008
Manuscript Accepted: June 13, 2008
Published: July 2, 2008

C. H. Liu, M. H. Hong, H. W. Cheung, F. Zhang, Z. Q. Huang, L. S. Tan, and T. S. A. Hor, "Bimetallic structure fabricated by laser interference lithography for tuning surface plasmon resonance," Opt. Express 16, 10701-10709 (2008)

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