Abstract
Multi-lamellar vesicles (MLV) which are shrunk under the osmotic condition can form a small nano-layered structure. When the internal structure of the shrunken MLV(SMLV) is geometrically anisotropic, it has an optically birefringence property; known as form birefringence. When the SMLV is trapped by the optical tweezers with a polarized laser beam, it can rotate due to the optical birefringence. We characterize the geometrical anisotropy of this internal structure using the relation between the rotational motion and the optical birefringence. We also present a simple model to describe the anisotropic internal structure of SMLV, where the layered structure is parameterized with the thickness of each lipid bi-layer and the internal distance between the next bi-layers.
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