Background: The need for practical and adaptable terahertz sources is apparent in the areas of application such as early cancer\ndiagnostics, nondestructive inspection of pharmaceutical tablets, visualization of concealed objects. We outline the operation principle\nand suggest the design of a simple appliance for generating terahertz radiation by a system of nanoobjects ââ?¬â?? gold nanobars\n(GNBs) or nanorings (GNRs) ââ?¬â?? irradiated by microwaves.\nResults: Our estimations confirm a feasibility of the idea that GNBs and GNRs irradiated by microwaves could become terahertz\nemitters with photon energies within the full width at half maximum of the longitudinal acoustic phononic DOS of gold\n(ca. 16ââ?¬â??19 meV, i.e., 3.9ââ?¬â??4.6 THz). A scheme of the terahertz radiation source is suggested based on the domestic microwave oven\nirradiating a substrate with multiple deposited GNBs or GNRs.\nConclusion: The size of a nanoobject for optimal conversion is estimated to be approx. 3 nm (thickness) by approx. 100 nm (length\nof GNB, or along the GNR). This detailed prediction is open to experimental verification. An impact is expected onto further\nstudies of interplay between atomic vibrations and electromagnetic waves in nanoobjects.
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