Dresden 2014 – wissenschaftliches Programm
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O: Fachverband Oberflächenphysik
O 79: Plasmonics and Nanooptics IV
O 79.9: Vortrag
Donnerstag, 3. April 2014, 18:00–18:15, TRE Ma
Coupled photon-exciton modes in CHPI-based devices — •David Leipold1, Wendy Niu2, Lindsey Ibbotson2, Vijaya Prakash3, Jeremy Baumberg2, and Erich Runge1 — 1Institut für Physik, Technische Universität Ilmenau, Germany — 2Cavendish Laboratory, University of Cambridge, UK — 3Nanophotonics Research Group, Indian Institute of Technology Delhi, India
Almost all designs proposed for future active all-optical data processing devices with subwavelength dimensions involve the coupling of electromagnetic excitations in or on metal (mostly plasmons) with nonlinear optics in dielectric materials (mostly due to excitons).
Candidates for the nonlinear materials are low-dimensional semiconductor heterostructures and organic dyes. While the former are hard to build close enough to the metal, the latter are generally chemically unstable at room temperature and high optical intensities.
Recently, CHPI ((C6H9C2H4NH3)2PbI4), a lead iodide based inorganic-organic hybrid material gained a lot of interest because it promises to combine the best of both worlds: like many organic dyes, CHPI can be spin-coated from a solution directly onto the metal interface. After drying, it forms self-assembled 2D semiconductor sheets. Thus, the CHPI combines the stability of an inorganic semiconductor nano-structure and the simple processing of an organic dye layer.
In this talk, we will present experiments and calculations with CHPI-covered metal gratings. Several optical modes can be identified which are predominantly localized in the slits of the grating. These show strong coupling with CHPI exciton resonances.