  Efficient manipulation of the N\'eel vector in antiferromagnets can be
induced by generation of spin orbit (SOT) or spin-transfer (STT) torques. Here
we predict another possibility for antiferromagnetic domain switching by using
a non-zero staggered field induced from optical laser excitation. We present
results on the atomistic scale dynamic simulations from the application of a
novel laser induced torque using optical frequencies for all-optical switching
(AOS) of the N\'eel vector in the antiferromagnet Mn$_2$Au. The driving
mechanism takes advantage of the sizeable 'exchange enhancement' characteristic
of antiferromagnets, allowing for small picosecond 90 and 180 degree
precessional switching with laser fluences on the order of mJ/cm$^2$. The
symmetry of these novel torques are highly dependent on the time-varying
magnetisation direction, creating a sign change in the torque which greatly
minimises the "over-shooting problem" common to SOT and STT. Lastly, we
demonstrate the opportunity for this laser optical torque to deterministically
switch single magnetic domains.
