Photonic crystals for enhanced light extraction from 2D materials

Noori, Yasir and Cao, Yameng and Roberts, Jonny and Woodhead, Christopher and Bernardo Gavito, Ramon and Tovee, Peter and Young, Robert James (2016) Photonic crystals for enhanced light extraction from 2D materials. ACS Photonics, 3 (12). pp. 2515-2520. ISSN 2330-4022

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In recent years, a range of two-dimensional (2D) transition metal dichalcogenides (TMDs) have been studied, and remarkable optical and electronic characteristics have been demonstrated. Furthermore, the weak interlayer Van der Waals interaction allows TMDs to adapt to a range of substrates. Unfortunately, the photons emitted from these TMD monolayers are difficult to efficiently collect into simple optics, reducing the practicality of these materials. The realization of on-chip optical devices for quantum information applications requires structures that maximize optical extraction efficiently whilst also minimizing substrate loss. In this work we propose a photonic crystal cavity based on silicon rods that allows maximal spatial and spectral coupling between TMD monolayers and the cavity mode. Finite difference time domain (FDTD) simulations revealed that TMDs coupled to this type of cavity have highly directional emission towards the collection optics, as well as up to 400% enhancement in luminescence intensity, compared to monolayers on flat substrates. We consider realistic fabrication tolerances and discuss the extent of the achievable spatial alignment with the cavity mode field maxima.

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Journal Article
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ACS Photonics
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This document is the Accepted Manuscript version of a Published Work that appeared in final form in ACS Photonics, copyright © 2016 American Chemical Society after peer review and technical editing by the publisher. To access the final edited and published work see
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21 Jul 2016 15:30
Last Modified:
28 May 2023 03:17