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Nonlinear microscopes have seen an increase in popularity in the life sciences due to their molecular and structural specificity, high resolution, large penetration depth, and volumetric imaging capability. Nonetheless, the inherently weak optical signals demand long exposure times for live cell imaging. Here, by modifying the optical layout and illumination parameters, we can follow the rotation and translation of noncentrosymetric crystalline particles, or nanodoublers, with 50 mu s acquisition times in living cells. The rotational diffusion can be derived from variations in the second harmonic intensity that originates from the rotation of the nanodoubler crystal axis. We envisage that by capitalizing on the biocompatibility, functionalizability, stability, and nondestructive optical response of the nanodoublers, novel insights on cellular dynamics are within reach.
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Carlos Alberto Macias Romero, Sylvie Roke, Siyuan Wang, Vitalijs Zubkovs
Emrah Bostan, Arno Pino Bouwens, Adrien Charles-François Raymond Descloux, Hilal Lashuel, Theo Lasser, Marcel Leutenegger, Tomas Lukes, Anne-Laure Mahul Mellier
Lina Carlini, Suliana Manley, Michaël Unser