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Experimental study of new type of plasmonic cavities is reported. We demonstrate the excitation of localised modes, with very high light confinement. The cavities are suitable for devices operating in the strong light-matter coupling regime.
We propose the design of a THz fiber that is composed of a polymer rod containing a hexagonal array of subwavelength air holes. A high air fraction gives an absorption loss of 0.018 cm-1.
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