Coupling Interlayer Excitons to Whispering Gallery Modes in van der Waals Heterostructures
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Date
2020-08-12
Publication Type
Journal Article
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Abstract
Van der Waals heterostructures assembled from two-dimensional materials offer a promising platform to engineer structures with desired optoelectronic characteristics. Here we use waveguide-coupled disk resonators made of hexagonal boron nitride (h-BN) to demonstrate cavity-coupled emission from interlayer excitons of a heterobilayer of two monolayer transition metal dichalcogenides. We sandwich a MoSe2–WSe2 heterobilayer between two slabs of h-BN and directly pattern the resulting stack into waveguide-coupled disk resonators. This enables us to position the active materials into regions of highest optical field intensity, thereby maximizing the mode overlap and the coupling strength. Since the interlayer exciton emission energy is lower than the optical band gaps of the individual monolayers and since the interlayer transition itself has a weak oscillator strength, the circulating light is only weakly reabsorbed, which results in an unaffected quality factor. Our devices are fully waveguide-coupled and represent a promising platform for on-chip van der Waals photonics.
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Publication status
published
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Book title
Journal / series
Volume
20 (8)
Pages / Article No.
6155 - 6161
Publisher
American Chemical Society
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Edition / version
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Date collected
Date created
Subject
interlayer excitons; transition metal dichalcogenides; h-BN photonics; whispering gallery mode resonator
Organisational unit
03944 - Novotny, Lukas / Novotny, Lukas
02205 - FIRST-Lab / FIRST Center for Micro- and Nanoscience
Notes
Funding
192362 - Antenna-coupled Optoelectronics (SNF)
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