Dresden 2014 – scientific programme

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O: Fachverband Oberflächenphysik

O 46: Plasmonics and Nanooptics I

O 46.10: Talk

Wednesday, April 2, 2014, 12:45–13:00, TRE Phy

Higher multipolar mode contributions to nonlinear nanoantenna response — Jan Renger¹, •Pablo M. de Roque¹, Nikos Fayard^1,2, Marta Castro-Lopez¹, Nicolo Accanto¹, and Niek F. van Hulst¹ — ¹ICFO-Institut de Ciencies Fotoniques, 08860 Castelldefels (Barcelona), Spain — ²Institut Langevin, ESPCI ParisTech, France

Nanoantennas, such as metallic nanorods featuring localized surface plasmon resonances (LSPR), are attractive for application such as optical sensing of chemicals or biomedical markers because of their wide spectral-tunability and strong mode confinement and enhancement. The latter one together with the intrinsically strong nonlinearity of metals allows these antennas to act as coherent nano light sources. For a short gold nanorod, the dipolar LSPR occurring in the visible spectral range will dominate the optical response. This resonance rapidly shifts towards the near infrared for a longer nanorod and additional multipolar modes contribute in the visible and NIR wavelength range. We identified the resonance conditions for the different multipolar modes by tracking the linear and nonlinear optical properties of nanorods for increasing lengths and to demonstrate that dark and bright multipolar modes of metallic nanorods contribute equally to the nonlinear optical emission via two-photon photoluminescence (TPPL) and second harmonic generation (SHG).