We propose Modloc, a new single molecule localization strategy based on a time signature. By shifting a structured excitation pattern, it induces a time modulated emission of the fluorophores where the phase holds its position. An efficient demodulation optical assembly compatible with short emitters On-time has been designed. Performances of ModLoc, will be discussed, in particular its 2 fold lateral precision improvement and its robustness to optical aberrations. By applying the modulation in a tilted direction, we will show that an almost isotropic 3D localization (~11 nm) is obtained over the whole capture range up to 30 µm in depth
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