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O: Fachverband Oberflächenphysik

O 25: Plasmonics and nanooptics: Light-matter interaction, spectroscopy II

O 25.5: Vortrag

Dienstag, 13. März 2018, 11:30–11:45, MA 041

Electrodynamic simulations of 2D random spectrometer in the very near-infrared regime — •Paris Varytis^1,2, Dan-Nha Huynh², Wladislaw Hartmann^3,4, Wolfram Pernice^3,4, and Kurt Busch^1,2 — ¹Max-Born-Institut, Max-Born-Str. 2A, 12489 Berlin, Germany — ²Humboldt-Universität zu Berlin, Institut für Physik, AG Theoretische Optik & Photonik, Newtonstr 15, 12489 Berlin, Germany — ³University of Münster, Institute of Physics, Wilhelm-Klemm-Str.10, 48149 Münster, Germany — ⁴University of Münster, CeNTech - Center for Nanotechnology, Heisenbergstr. 11, 48149 Münster, Germany

Random spectrometers are suitable for portable sensing and efficient lab-on-a-chip functionality. Here, a comprehensive study of a random spectrometer based on 2D planar waveguiding structures in the very near-infrared and visible regime is presented. Our silicon-nitride-based integrated-optical layout is analyzed for both, TE and TM polarizations, by means of Mie theory and electromagnetic simulations using the Discontinuous Galerkin Time-Domain method. It is shown that in the diffusive regime the spectral resolution depends on single scattering properties such as the scattering efficiency and asymmetry parameter. Moreover, shifting from the near-infrared to the visible regime, the transport mean free path is reduced due to the stronger scattering and therefore enhanced effective optical path leads to higher spectral resolution.