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We report on experiments with M\"obius strip microlasers which werefabricated with high optical quality by direct laser writing. A M\"obius strip,i.e., a band with a half twist, exhibits the fascinating property that it has asingle nonorientable surface and a single boundary. We provide evidence that,in contrast to conventional ring or disk resonators, a M\"obius strip cavitycannot sustain whispering gallery modes (WGM). Comparison between experimentsand 3D finite difference time domain (FDTD) simulations reveals that theresonances are localized on periodic geodesics.

M\"obius Strip Microlasers: a Testbed for Non-Euclidean Photonics