Berlin 2018 – wissenschaftliches Programm
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DS: Fachverband Dünne Schichten
DS 28: 2D materials: Chalcogenides II (joint session HL/DS)
DS 28.4: Vortrag
Donnerstag, 15. März 2018, 10:15–10:30, A 151
Coupling of a monolayer of WSe2 to an InGaP bullseye cavity — •Oliver Iff1, Vasilij Baumann1, Monika Emmerling1, Marcelo Davanco2, Kartik Srinivasan2, Sven Hoefling1,3, and Christian Schneider1 — 1Technische Physik, Universitaet Wuerzburg, Am Hubland, Wuerzburg, Germany — 2Center for Nanoscale Science and Technology, National Institute of Standards and Technology, Gaithersburg, Maryland, U.S.A. — 3SUPA, School of Physics and Astronomy, University of St Andrews, St Andrews, UK
Photonic cavities based on circular gratings can be used to enhance the emission of optically active materials. Here, we investigate the optical properties of such a cavity consisting of centric rings of InGaP which are completely surrounded by air, forming a floating membrane. The characterization was done via photoluminescence measurements using embedded quantum dots as light source and spatially mapping out the near field emission. Strikingly, the grating membrane can also be transferred via the dry-stamp method onto a given substrate without disturbing its optical modes and therefore opening up new ways of building coupled systems. Furthermore, the structures are optimized for wavelengths near 750nm, making it suitable for coupling to different kinds of 2D materials like WSe2 or MoSe2. A monolayer of WSe2 has been transferred onto the cavity showing improved photoluminescence of the charged exciton right at the centre position. This enables a new path to couple monolayer of 2D materials to photons in order to gain access to quantum electrodynamic effects including strong light-matter coupling.