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OPCM images of the cell for different values of the phase offset Ψ (a: −90°; b: +90°) between the reference and diffracted beam of the OPCM at optical immersion, i.e. refractive index matching, conditions without NPs (left) and including 42 gold NPs (middle – at no resonance, right – at resonance) randomly located at the surface of the cell nucleus.
