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arXiv · 2203.00391

Directing Monolayer Tungsten Disulfide Photoluminescence using a Bent Plasmonic Nanowire on a Mirror Cavity

Shailendra K. Chaubey·Sunny Tiwari·Ashutosh Shukla·Gokul M. A.·Atikur Rahman·G. V. Pavan Kumar
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Abstract

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 and a gold mirror. We image the photoluminescence emission wavevectors by using the Fourier plane imaging technique. The cavity out-couples the emission in a narrow range of wavevectors with a radial and azimuthal spreading of only 11.0{\deg} and 25.1{\deg}, 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.

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Shailendra K. Chaubey, Sunny Tiwari, Ashutosh Shukla, Gokul M. A., Atikur Rahman, G. V. Pavan Kumar. 2022-03-01. Directing Monolayer Tungsten Disulfide Photoluminescence using a Bent Plasmonic Nanowire on a Mirror Cavity. https://doi.org/10.1140/epjs/s11734-022-00511-y

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