Fraunhofer-Gesellschaft

Publica

Hier finden Sie wissenschaftliche Publikationen aus den Fraunhofer-Instituten.

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
 
: Knopf, H.; Lundt, N.; Bucher, T.; Höfling, S.; Tongay, S.; Taniguchi, T.; Watanabe, K.; Staude, I.; Schulz, U.; Schneider, C.; Eilenberger, F.

:
Fulltext ()

Optical Materials Express 9 (2019), No.2, pp.598-610
ISSN: 2159-3930
Bundesministerium für Bildung und Forschung BMBF (Deutschland)
13XP5053A
English
Journal Article, Electronic Publication
Fraunhofer IOF ()

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-Bragg-reflector (DBR) cavities may, e.g., be tuned to match the exciton resonance of the 2D-materials. 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.

: http://publica.fraunhofer.de/documents/N-549446.html