Surface plasmon scattering on polymer-bimetal layer covered fused silica gratings generated by laser induced backside wet etching

H. Tóháti, Á Sipos, G. Szekeres, A. Mathesz, A. Szalai, P. Jójárt, J. Budai, C. Vass, A. Koházi-Kis, M. Csete, Z. Bor

Research output: Contribution to journalArticle

6 Citations (Scopus)

Abstract

Large amplitude fused silica gratings are prepared by combining the UV laser induced backside wet etching technique (LIBWE) and the two-beam interference method. The periodic patterning of fused silica surfaces is realized by s-polarized fourth harmonic beams of a Nd:YAG laser, applying saturated solution of naphthalene in methyl-methacrylate as liquid absorber. Atomic force microscopy is utilized to analyze how the modulation amplitude of the grating can be controlled by the fluence and number of laser pulses. Three types of plasmonic structures are prepared by a bottom-up method, post-evaporating the fused silica gratings by gold-silver bimetal layers, spin-coating the metal structures by thin polycarbonate films, and irradiating the multilayers by UV laser. The effect of the bimetal and polymer-coated bimetal gratings on the surface plasmon resonance is investigated in a modified Kretschmann arrangement allowing polar and azimuthal angle scans. It is demonstrated experimentally that scattering on rotated gratings results in additional minima on the resonance curves of plasmons excited by second harmonic beam of a continuous Nd:YAG laser. The azimuthal angle dependence proves that these additional minima originate from back-scattering. The analogous reflectivity minima were obtained by scattering matrix method calculations realized taking modulation depths measured on bimetal gratings into account.

Original languageEnglish
Pages (from-to)5130-5137
Number of pages8
JournalApplied Surface Science
Volume255
Issue number10
DOIs
Publication statusPublished - Mar 1 2009

Fingerprint

Bimetals
Wet etching
Fused silica
Polymers
Scattering
polycarbonate
Lasers
Plasmons
Methacrylates
Amplitude modulation
Spin coating
Surface plasmon resonance
Naphthalene
Polycarbonates
Silver
Gold
Laser pulses
Atomic force microscopy
Multilayers
Metals

Keywords

  • AFM
  • Grating
  • Interference lithography
  • Laser induced backside wet etching (LIBWE)
  • Scattering
  • SPR

ASJC Scopus subject areas

  • Surfaces, Coatings and Films

Cite this

Surface plasmon scattering on polymer-bimetal layer covered fused silica gratings generated by laser induced backside wet etching. / Tóháti, H.; Sipos, Á; Szekeres, G.; Mathesz, A.; Szalai, A.; Jójárt, P.; Budai, J.; Vass, C.; Koházi-Kis, A.; Csete, M.; Bor, Z.

In: Applied Surface Science, Vol. 255, No. 10, 01.03.2009, p. 5130-5137.

Research output: Contribution to journalArticle

Tóháti, H. ; Sipos, Á ; Szekeres, G. ; Mathesz, A. ; Szalai, A. ; Jójárt, P. ; Budai, J. ; Vass, C. ; Koházi-Kis, A. ; Csete, M. ; Bor, Z. / Surface plasmon scattering on polymer-bimetal layer covered fused silica gratings generated by laser induced backside wet etching. In: Applied Surface Science. 2009 ; Vol. 255, No. 10. pp. 5130-5137.
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