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O: Fachverband Oberflächenphysik
O 9: Plasmonics and Nanooptics I: Local Probes and Raman (joint session O/CPP)
O 9.3: Vortrag
Montag, 16. März 2020, 11:00–11:15, WIL A317
Broadband measurement of local density of optical states by plasmonic nanofocusing spectral interferometry — •Abbas Chimeh1, Martin Esmann2, Anke Korte1, Jinhui Zhong1, Nahid Talebi3, and Christoph Lienau1 — 1Universität Oldenburg, Oldenburg, Germany — 2Centre de Nanosciences et de Nanotechnologies, Paris, — 3Universität Kiel, Kiel, Germany
The local density of optical states (LDOS) is one of the most fundamental quantities in nanophotonics [1]. Experimental mapping of the LDOS enables to understand how a quantum emitter is coupled to its nanostructred photonic environment. Here, we demonstrate a novel experimental approach to directly measure the LDOS with <10 nm spatial resolution in a broad spectral range. Surface plasmon polaritons (SPPs) propagating along a conical gold taper are adiabatically converted to a local dipole mode at the very apex [2], which can locally excite and detect the optical states around single gold nanoparticles. Integration of an inline interferometer in this plasmonic nanofocusing taper allows us to extract amplitude a phase of local light scattering spectra of gold nanoparticles and quantify line broadenings and spectral shifts induced by tip-sample coupling [3]. We show that, in the limit of weak tip-sample coupling, this measurements directly probe the projected local density of optical states of the plasmonic system.
[1] R. Carminati et al., Surf. Sci. Rep. 70, 1 (2015) [2] M. Esmann et al., Nature Nanotechnol. 6, 6040 (2019) [3] M. Esmann et al., Nanophotonics, in press (2020)