Non‐regularly shaped plasmon resonant nanoparticle as localized light source for near‐field microscopy

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Abstract
We study numerically two‐dimensional nanoparticles with a non‐regular shape and demonstrate that these particles can support many more plasmon resonances than a particle with a regular shape (e.g. an ellipse). The electric field distributions associated with these different resonances are investigated in detail in the context of near‐field microscopy. Depending on the particle shape, extremely strong and localized near‐fields, with intensity larger than 105 that of the illumination wave, can be generated. We also discuss the spectral dependence of these near‐fields and show that different spatial distributions are observed, depending which plasmon resonance is excited in the particle.