  The estimations done confirm a feasibility of the idea that gold nanobars
(GNBs) and nanorings (GNRs) irradiated by microwaves could become the terahertz
(THz) emitters with photon energies within the full width at half maximum of
longitudinal acoustic phononic DOS of gold (~13.7-17.5 meV, i.e., 3.3-4.2 THz).
A scheme of the THz radiation source is suggested based on the domestic
microwave oven irradiating a substrate with multiple deposited GNBs or GNRs.
