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Q: Fachverband Quantenoptik und Photonik

Q 40: Photonics II

Q 40.2: Vortrag

Mittwoch, 8. März 2023, 14:45–15:00, F442

Light transport in designed symmetric multiple-scattering media — •Sudhir Saini¹, Kayleigh Start¹, Evangelos Marakis², and Pepijn Pinkse¹ — ¹MESA+ Institute for Nanotechnology, University of Twente, The Netherlands — ²Institute of Electronic Structure and Laser, Foundation for Research and Technology-Hellas, Crete, Greece

The latest advancement in nanofabrication technology enables the exact synthesis of designed scattering media with features on the scale of the optical wavelength. To the best of our knowledge, random scattering media with global symmetries do not naturally occur. Here we use modern nanofabrication to study the effect on light propagation of mirror-symmetric disorder in a multiple-scattering medium. A commercial direct laser writing technique based on two-photon polymerization is used to fabricate the designed three-dimensional (3D) mirror-symmetric disordered samples. Light transport experiments combined with quantitative 3D modeling are used to study the effect of mirror symmetry on the medium's scattering properties. The optical characterization results establish polarization-dependent deviations at the symmetry plane from the bulk ensemble-averaged intensity distribution when pumped in an equally mirror-symmetric way. In the weak-scattering limit, Drexhage's theory for the emission properties of an emitter above a mirror predicts the experimentally observed intensity patterns well. We model our experiments with FE numerical methods in the multiple-scattering regime. Applications are envisioned in fundamental light propagation studies and anti-counterfeiting.