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Whispering-gallery mode (WGM) microtoroid optical resonators have been used for highly sensitive biological and chemical sensing. With the help of auto-balanced detection and data processing techniques, frequency locked optical whispering evanescent resonator (FLOWER) has successfully reduced external noise and achieved detection of single macromolecules. FLOWER, however, can only analyze the size of particles and not their shape. To determine the shape of non-spherical particles interacting with different polarized WGM modes, we built a dual-FLOWER system to perform multi-mode locking. We demonstrate the ability of this system to detect particle shape by detecting gold nanorods and spheres.
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