Rotated grating coupled surface plasmon resonance on wavelength-scaled shallow rectangular gratings

A. Szalai; G. Szekeres; J. Balázs; A. Somogyi; Maria Csete

doi:10.1117/12.2024527

11 September 2013 Rotated grating coupled surface plasmon resonance on wavelength-scaled shallow rectangular gratings

A. Szalai, G. Szekeres, J. Balázs, A. Somogyi, Maria Csete

Proceedings Volume 8809, Plasmonics: Metallic Nanostructures and Their Optical Properties XI; 88092U (2013) https://doi.org/10.1117/12.2024527
Event: SPIE NanoScience + Engineering, 2013, San Diego, California, United States

Abstract

Theoretical investigation of rotated grating coupling phenomenon was performed on a multilayer comprising 416-nmperiodic shallow rectangular polymer grating on bimetal film made of gold and silver layers. During the multilayer illumination by 532 nm wavelength p-polarized light the polar and azimuthal angles were varied. In presence of 0-35 nm, 0-50 nm and 15-50 nm thick polymer-layers at the valleys and hills splitting was observed on the dual-angle dependent reflectance in two regions: (i) close to 0° azimuthal angle corresponding to incidence plane parallel to the periodic pattern (P-orientation); and (ii) around ~33.5°/29°/30° azimuthal angle (C-orientation), in agreement with our previous experimental studies. The near-field study revealed that in P-orientation the E-field is enhanced at the glass side with p/2 periodicity at the first minimum appearing at 49°/50°/52° polar angles, and comprises maxima below both the valleys and hills; while E-field enhancement is observable both at the glass and polymer side with p-periodicity at the second minimum developing at 55°/63/64° tilting, comprising maxima intermittently below the valleys or above the hills. In Corientation coupled plasmonic modes are observable, involving modes propagating along the valleys at the secondary maxima appearing at ~35°/32°/32° azimuthal and ~49°/51°/56° polar angles, while modes confined along the polymer hills are observable at the primary minima, which are coupled most strongly at the ~31.5°/25°/28° azimuthal and ~55°/63°/66° polar angles. The secondary peak observable in C-orientation is proposed for biosensing applications, since the supported modes are confined along the valleys, where biomolecules prefer to attach.

Citation Download Citation

A. Szalai, G. Szekeres, J. Balázs, A. Somogyi, and Maria Csete "Rotated grating coupled surface plasmon resonance on wavelength-scaled shallow rectangular gratings", Proc. SPIE 8809, Plasmonics: Metallic Nanostructures and Their Optical Properties XI, 88092U (11 September 2013); https://doi.org/10.1117/12.2024527

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