  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.
