Prismatic zinc oxide microtubes have been fabricated by vapor transport. Room-temperature ultraviolet lasing action has been demonstrated in these microtube arrays. The ZnO microtubes, mainly appearing in a tapped bell-mouthed shape, form natural laser cavities along the length direction. The hexagon diagonal and length of the microtube vary from 1 um to 20 um and 10 um to a few hundred um respectively. Under 355nm optical excitation, lasing action is observed at room-temperature around 393nm. Multi-longitudinal modes are also observed with significantly narrowed emission linewidth.

 

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