Plasmonic structure generation by laser illumination of silica colloid spheres deposited onto prepatterned polymer-bimetal films

Á Sipos, H. Tóháti, A. Szalai, A. Mathesz, M. Görbe, T. Szabó, M. Szekeres, B. Hopp, M. Csete, I. Dékány

Research output: Contribution to journalArticle

6 Citations (Scopus)

Abstract

Plasmonic structures are prepared on bimetal films evaporated onto glass substrates applying a multi-step process, and atomic force microscopy is utilized to study the structures after each step. Sub-micrometer gratings are generated on polycarbonate films spin-coated onto silver-gold bimetal layers by interference lithography (IL) applying the fourth harmonics of a Nd:YAG laser. These polymer gratings are used as prepatterned templates in order to deposit silica colloid spheres by spin-coating. It is shown that the conditions of periodic silica sphere-array formation along the template valleys are sufficiently large grating modulation depth, appropriate ratio of silica sphere diameter to grating period, and optimized speed of spinning. The periodic silica sphere arrays are illuminated by a homogeneous KrF excimer laser beam, and periodically arrayed sub-wavelength holes are drilled into bimetal films via colloid sphere lithography (CSL). The characteristic dimensions of the resulted plasmonic structures are defined by the polymer grating period and by the silica colloid sphere diameter. Attenuated total reflection spectroscopy is performed exciting plasmons on different metal-dielectric interfacial structures by the second harmonic of a continuous Nd:YAG laser. The polar and azimuthal angle dependent grating-coupling and scattering effects of the complex periodic structures on the resonance characteristic of plasmons is demonstrated.

Original languageEnglish
Pages (from-to)5138-5145
Number of pages8
JournalApplied Surface Science
Volume255
Issue number10
DOIs
Publication statusPublished - Mar 1 2009

Fingerprint

Bimetals
Colloids
Silicon Dioxide
Polymers
Lighting
Silica
Lasers
polycarbonate
Plasmons
Lithography
Periodic structures
Spin coating
Excimer lasers
Polycarbonates
Silver
Gold
Laser beams
Atomic force microscopy
Deposits
Metals

Keywords

  • Colloid sphere lithography
  • Grating coupling/scattering
  • Interference lithography
  • Plasmonic structure

ASJC Scopus subject areas

  • Surfaces, Coatings and Films

Cite this

Plasmonic structure generation by laser illumination of silica colloid spheres deposited onto prepatterned polymer-bimetal films. / Sipos, Á; Tóháti, H.; Szalai, A.; Mathesz, A.; Görbe, M.; Szabó, T.; Szekeres, M.; Hopp, B.; Csete, M.; Dékány, I.

In: Applied Surface Science, Vol. 255, No. 10, 01.03.2009, p. 5138-5145.

Research output: Contribution to journalArticle

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AU - Tóháti, H.

AU - Szalai, A.

AU - Mathesz, A.

AU - Görbe, M.

AU - Szabó, T.

AU - Szekeres, M.

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AB - Plasmonic structures are prepared on bimetal films evaporated onto glass substrates applying a multi-step process, and atomic force microscopy is utilized to study the structures after each step. Sub-micrometer gratings are generated on polycarbonate films spin-coated onto silver-gold bimetal layers by interference lithography (IL) applying the fourth harmonics of a Nd:YAG laser. These polymer gratings are used as prepatterned templates in order to deposit silica colloid spheres by spin-coating. It is shown that the conditions of periodic silica sphere-array formation along the template valleys are sufficiently large grating modulation depth, appropriate ratio of silica sphere diameter to grating period, and optimized speed of spinning. The periodic silica sphere arrays are illuminated by a homogeneous KrF excimer laser beam, and periodically arrayed sub-wavelength holes are drilled into bimetal films via colloid sphere lithography (CSL). The characteristic dimensions of the resulted plasmonic structures are defined by the polymer grating period and by the silica colloid sphere diameter. Attenuated total reflection spectroscopy is performed exciting plasmons on different metal-dielectric interfacial structures by the second harmonic of a continuous Nd:YAG laser. The polar and azimuthal angle dependent grating-coupling and scattering effects of the complex periodic structures on the resonance characteristic of plasmons is demonstrated.

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