Directing monolayer tungsten disulfide photoluminescence using a bent-plasmonic nanowire on a mirror cavity

Designing directional optical antennas without compromising the field enhancement requires specially designed optical cavities. Herein, we report on the experimental observations of directional photoluminescence emission from a monolayer tungsten disulfide using a bent-plasmonic nanowire on a mirror...

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Bibliographic Details
Published in:The European physical journal. ST, Special topics Special topics, 2022-05, Vol.231 (4), p.807-813
Main Authors: Chaubey, Shailendra K., Tiwari, Sunny, Shukla, Ashutosh, Gokul, M. A., Rahman, Atikur, Kumar, G. V. Pavan
Format: Article
Language:English
Subjects:
Antennas
Atomic
Classical and Continuum Physics
Condensed Matter Physics
Directivity
Emission
Holes
Imaging techniques
Materials Science
Measurement Science and Instrumentation
Molecular
Monolayers
Nanowires
Optical and Plasma Physics
Photoluminescence
Photonic Materials: From Fundamentals to Applications
Physics
Physics and Astronomy
Plasmonics
Regular Article
Silver
Tungsten disulfide
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Summary:Designing directional optical antennas without compromising the field enhancement requires specially designed optical cavities. Herein, we report on the experimental observations of directional photoluminescence emission from a monolayer tungsten disulfide using a bent-plasmonic nanowire on a mirror cavity. The geometry provides field enhancement and directivity to photoluminescence by sandwiching the monolayer between an extended cavity formed by dropcasting bent-silver nanowire on a gold mirror. We image the photoluminescence emission wavevectors using Fourier plane imaging technique. The cavity outcouples the emission in a narrow range of wavevectors with a radial and azimuthal spreading of only 11.0 ∘ and 25.1 ∘ , respectively. Furthermore, we performed three-dimensional finite difference time domain-based numerical calculations to corroborate and understand the experimental results. We envisage that the results presented here will be readily harnessed for on-chip coupling applications and in designing inelastic optical antennas.
ISSN:1951-6355
1951-6401
DOI:10.1140/epjs/s11734-022-00511-y