SKM 2023 – wissenschaftliches Programm
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HL: Fachverband Halbleiterphysik
HL 52: Focus: Self-Assembly of Plasmonic Nanostructures (joint session CPP/HL)
HL 52.5: Vortrag
Freitag, 31. März 2023, 10:45–11:00, GÖR 226
Investigating Charge Transfers in Colloidal Photonic Crystal Slabs — •Swagato Sarkar1 and Tobias A. F. König1,2 — 1Leibniz-Institut für Polymerforschung Dresden e.V., Institute of Physical Chemistry, Hohe Str. 6, 01069 Dresden, Germany — 2Center for Advancing Electronics Dresden (cfaed), Technische Universität Dresden, Helmholtzstraße 18, 01069 Dresden
The challenges of large-scale and low-loss plasmonic charge transfers are systematically investigated by optical designs with colloidal 1D plasmonic lattice structures. These plasmonic lattices are used as couplers to confine the incident energy into the underlying titanium dioxide layers, thus acting as colloidal photonic crystal (cPhC) slabs. Conventionally, photodetection is possible at energy levels close to the semiconductor bandgap; however, with the observed plasmonic-photonic hybrid modes, the extended solar spectrum can be used for energy harvesting. The photo-amplified current is measured locally with simple two-point contact on the centimeter-sized nanostructure by applying a bias voltage. The optical concepts for metallic grating composed of nanobars are extended for the first time to colloidal self-assembled gold nanoparticle (AuNP) chains to make large-scale charge injection accessible at a reasonable cost. Further, the possibility of photodetection by electric field vectors lying both along and perpendicular to the grating lines can be achieved by tuning the plasmonic grating periodicities.