  Spin canting and complex spin textures in antiferromagnetic materials can
often be described in terms of Dzyaloshinskii-Moriya interactions (DMI). Values
for DMI parameters are not easily measurable directly, and often inferred from
other quantities. In this work, we examine how domain wall dynamics in an
antiferromagnetic optomagnonic system can display unique features directly
related to the existence of DMI. Our results indicate that the presence of DMI
enables spin interactions with cavity photons in a geometry which otherwise
allows no magneto-optical coupling, and on the other hand modulates frequencies
in a geometry where coupling is already realized in the absence of DMI. This
result may be used to measure the DMI constant in optomagnonic experiments by
comparing resonances obtained with different polarisations of the exciting
field.
