Optical resonances and nanofocusing in triangular metal nano-grooves

Thomas Søndergaard; Sergey I. Bozhevolnyi; Jonas Beermann; Sergey M. Novikov; Eloïse Devaux; Thomas W. Ebbesen; Jens Rafaelsen

doi:10.1117/12.859861

10 September 2010 Optical resonances and nanofocusing in triangular metal nano-grooves

Thomas Søndergaard, Sergey I. Bozhevolnyi, Jonas Beermann, Sergey M. Novikov, Eloïse Devaux, Thomas W. Ebbesen, Jens Rafaelsen

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Proceedings Volume 7757, Plasmonics: Metallic Nanostructures and Their Optical Properties VIII; 77571R (2010) https://doi.org/10.1117/12.859861
Event: SPIE NanoScience + Engineering, 2010, San Diego, California, United States

Abstract

Optical resonances in a single triangular-shaped metal groove and a periodic array of grooves are studied theoretically with the Green's function surface integral equation method. In the case of a single groove we study the geometric resonances for different groove heights, and show that the groove resonances can be explained by standing waves in the gap being reflected at both the closed groove bottom and the open groove top. We also present the reflection that will be obtained for different cases of picking up the reflected light within a small or large angular range. Large resonant fields at the groove bottom are explained as being due to nanofocusing by the groove which can also be thought of as a closed tapered gap. In the case of a periodic array of grooves we find that resonances of individual grooves are still present in near-field enhancement spectra and reflection spectra but there are also e.g. very sharp resonances (Rayleigh anomalies) at wavelengths near the cutoff wavelength of higher grating-reflection orders. Typical resonant enhancements can easily be two times higher compared with the case of a single groove. The resonances can be realized in the wavelength range from the visible to the infrared by varying groove height, angle, and periodicity.

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Thomas Søndergaard, Sergey I. Bozhevolnyi, Jonas Beermann, Sergey M. Novikov, Eloïse Devaux, Thomas W. Ebbesen, and Jens Rafaelsen "Optical resonances and nanofocusing in triangular metal nano-grooves", Proc. SPIE 7757, Plasmonics: Metallic Nanostructures and Their Optical Properties VIII, 77571R (10 September 2010); https://doi.org/10.1117/12.859861

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KEYWORDS

Reflection

Metals

Gold

Gaussian beams

Near field

Wave propagation

Magnetism

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