Plasmonic dark modes excited by strongly focused illumination

Jordi Sancho-Parramon; Salvador Bosch; David Maluenda; Hrvoje Zorc

doi:10.1117/12.2187807

28 August 2015 Plasmonic dark modes excited by strongly focused illumination

Jordi Sancho-Parramon, Salvador Bosch, David Maluenda, Hrvoje Zorc

Proceedings Volume 9547, Plasmonics: Metallic Nanostructures and Their Optical Properties XIII; 954731 (2015) https://doi.org/10.1117/12.2187807
Event: SPIE Nanoscience + Engineering, 2015, San Diego, California, United States

Abstract

Dark plasmon modes in metal nanoparticle systems are usually excited by non-optical means. We show that strongly focused illumination can lead to excitation of dark modes. We first use rigorous vectorial diffraction theory to compute the distribution of light at the focus and then numerically calculate the response of single particles and particle dimers. Controlling the distribution of light arriving at the focusing lens by pupil filters enables enhancing the excitation of dark modes. Overall, these results present guidelines for the excitation of dark plasmon modes using standard optical instrumentation.

Citation Download Citation

Jordi Sancho-Parramon, Salvador Bosch, David Maluenda, and Hrvoje Zorc "Plasmonic dark modes excited by strongly focused illumination", Proc. SPIE 9547, Plasmonics: Metallic Nanostructures and Their Optical Properties XIII, 954731 (28 August 2015); https://doi.org/10.1117/12.2187807

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