Axion-like particle searches with sub-THz photons

We propose a variation, based on very low energy and extremely intense photon sources, on the well established technique of Light-Shining-through-Wall (LSW) experiments for axion-like particle searches. With radiation sources at 30 GHz, we compute that present laboratory exclusion limits on axion-like particles might be improved by at least four orders of magnitude, for masses m(a) less than or similar to 0.01 meV. This could motivate research and development programs on dedicated single-photon sub-THz detectors.