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(A,B) Brillouin shift (νB) image of a single microgel of U-2K-16 type (A) and U-0.6K-16 type (B). (C,D) Quantitative phase image of a single microgel for refractive index (RI) determination of U-2K-16 type (A) and U-0.6K-16 type (B). Color scale bar: Phase shift in radians. (E,F) Cross-section of a tomographic RI reconstruction from the quantitative phase images (C) and (D) (by assuming spherical symmetry) of U-2K-16 type (E) and U-0.6K-16 type (F).
