Parts | Days | Selection | Search | Updates | Downloads | Help
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).