Berlin 2018 – scientific programme

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HL: Fachverband Halbleiterphysik

HL 52: Optical properties & Photonic crystals

HL 52.5: Talk

Friday, March 16, 2018, 10:30–10:45, EW 201

Functionalized Nanoporous Au Particles for Enhanced Optical Nonlinearities — •Jue-min Yi¹, Dong Wang², Felix Schwarz³, Germann Hergert¹, Jan Vogelsang¹, Petra Groß¹, Peter Schaaf², Erich Runge³, and Christoph Lienau¹ — ¹Carl von Ossietzky Universität, Oldenburg — ²TU Ilmenau, Ilmenau — ³TU Ilmenau, Ilmenau

Nanoporous Au particles (nanosponges) have promising optical properties due to their percolated nanoporous structure with disorder and nanometers-sized pores where coherent multiple scattering of light can form a series of localized hot spots with large field enhancement. Here we have systematically studied the nonlinear optical effects from nanosponges and their functionalization with ZnO materials. In particular, we have performed time-resolved photoemission measurements on single nanosponges using ultrashort laser pulse excitation. The long-lived electron emission with high excitation efficiency proves the existence of localized plasmon states on the surface of the nanoporous particles with lifetimes of more than 20 fs [1]. We have further investigated their potential as disordered nanoantennas by depositing ZnO into nanometers-sized pores. Strong second harmonic emissions from ZnO in the vicinity of nanosponges have been observed. Our results indicate that individual nanosponges are robust disordered nanoantennas with strong local resonances, and shed new light on tailoring disorder with functional materials for specific applications.[1] G. Hergert, et al., Light: Science &Applications 6, e17075 (2017).