Integration of atomically thin layers of transition metal dichalcogenides into high-Q, monolithic Bragg-cavities: An experimental platform for the enhancement of the optical interaction in 2D-materials

Heiko Knopf, Nils Lundt, Tobias Bucher, Sven Höfling, Sefaattin Tongay, Takashi Taniguchi, Kenji Watanabe, Isabelle Staude, Ulrike Schulz, Christian Schneider, Falk Eilenberger

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5 Scopus citations

Abstract

We demonstrate a new approach to integrate single layer MoSe2 and WSe2 flakes into monolithic all-dielectric planar high-quality micro-cavities. These distributed-Braggreflector (DBR) cavities may, e.g., be tuned to match the exciton resonance of the 2Dmaterials. They are highly robust and compatible with cryogenic and room-temperature operation. The integration is achieved by a customized ion-assisted physical vapor deposition technique, which does not degrade the optical properties of the 2D-materials. The monolithic 2D-resonator is shown to have a high Q-factor in excess of 4500. We use photoluminescence (PL) experiments to demonstrate that the coating procedure with a SiO2 coating on a prepared surface does not significantly alter the electrooptical properties of the 2D-materials. Moreover, we observe a resonance induced modification of the PL-spectrum for the DBR embedded flake. Our system thus represents a versatile platform to resonantly enhance and tailor light-matter-interaction in 2D-materials. The gentle processing conditions would also allow the integration of other sensitive materials into these highly resonant structures.

Original languageEnglish (US)
Pages (from-to)598-610
Number of pages13
JournalOptical Materials Express
Volume9
Issue number2
DOIs
StatePublished - Feb 1 2019

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ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials

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