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Unidirectional Doubly Enhanced MoS2 Emission via Photonic Fano Resonances
journal contribution
posted on 2017-10-09, 00:00 authored by Xingwang Zhang, Shinhyuk Choi, Dake Wang, Carl H. Naylor, A. T. Charlie Johnson, Ertugrul CubukcuAtomically
thin transition metal dichalcogenides like MoS2 monolayers
exhibit unique luminescent properties. However, weak
quantum yield and low light absorption hinder their practical applications
in two-dimensional light emitting devices. Here, we report 1300 times
enhancement in photoluminescence emission from a MoS2 monolayer
via simultaneous Fano resonances in a dielectric photonic crystal.
The spatially extended double Fano resonance scheme allows resonant
enhancement of both the MoS2 absorption and emission. We
also achieve unidirectional emission within a narrow divergence angle
of 5° by engineering the Fano resonance angular dispersion. Our
approach provides a new platform for efficient light sources with
high directionality based on emerging two-dimensional materials.
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Fano resonance schemelight absorptiondivergence angleUnidirectional Doubly Enhanced MoS 2 Emissiontransition metal dichalcogenidesreport 1300 times enhancementFano resonanceMoS 2 absorptionphotoluminescence emissionMoS 2 monolayerPhotonic Fano Resonances AtomicallyFano resonancesdielectric photonic crystalMoS 2 monolayers exhibitlight sources
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