  The invisible axion is a hypothetical particle that arises from the
Peccei-Quinn mechanism proposed to resolve the CP problem in quantum
chromodynamics, and is considered one of the most favoured candidates for cold
dark matter. Dish antennas can provide a useful scheme for sensitive search for
dark matter axions. The conversion power through axion-photon couplings is
proportional to the surface area of the metal plate, rather than the volume of
the available magnetic field. To maximize the effect, we propose an advanced
concept of haloscope that involves an array of horn antennae to increase the
axion-induced photons and a reflector to focus them onto a photo sensor.
Compared to other proposed schemes, this configuration can significantly
improve the experimental sensitivity, especially in the terahertz region.
