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Principle of phase conjugation of fluorescence. (a) A fluorescent particle is excited and the scattered fluorescence is collected by a PCM. (b) The PCM conjugates the phase of the light and reverses its direction. Thanks to the reciprocity of light propagation, the light refocuses at the position of the particle. Note that the conjugated light matches the wavelength of the emitted light (not that of the excitation light).
