Triangular (top left), square (top right), pentagon (bottom left), and star (bottom right) resonant modes excited by a 632 nm laser in a high quality factor whispering gallery microcavity.

From the article:

Polygon Coherent Modes in a Weakly Perturbed Whispering Gallery Microresonator for Efficient Second Harmonic, Optomechanical, and Frequency Comb Generations
Zhiwei Fang, Sanaul Haque, Saeed Farajollahi, Haipeng Luo, Jintian Lin, Rongbo Wu, Jianhao Zhang, Zhe Wang, Min Wang, Ya Cheng, and Tao Lu
Phys. Rev. Lett. 125, 173901 (2020)

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