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Synthesized micro- and nanotubes composed of transition metal dichalcogenides(TMDCs) such as MoS$_2$ are promising for many applications in nanophotonics,because they combine the abilities to emit strong exciton luminescence and toact as whispering gallery microcavities even at room temperature. In additionto tubes in the form of hollow cylinders, there is an insufficiently-studiedclass of twisted tubes, the flattened cross section of which rotates along thetube axis. As shown by theoretical analysis, in such nanotubes the interactionof electromagnetic waves excited at opposite sides of the cross section cancause splitting of the whispering gallery modes. By studyingmicro-photoluminescence spectra measured along individual MoS$_2$ tubes, it hasbeen established that the splitting value, which controls the energies of thesplit modes, depends exponentially on the aspect ratio of the cross section,which varies in "breathing" tubes, while the relative intensity of the modes ina pair is determined by the angle of rotation of the cross section. Theseresults open up the possibility of creating multifunctional tubular TMDCnanodevices that provide resonant amplification of self-emitting light atadjustable frequencies.

Twisted Nanotubes of Transition Metal Dichalcogenides with Split Optical Modes for Tunable Radiated Light Resonators