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Pump-Probe Nanoscopy by Means of Transient Absorption Saturation

In this paper, we present a method to perform super-resolution label-free optical microscopy by means of the saturation of the transient absorption process. We developed a novel and easy-to-implement setup based on a commercial confocal microscope. We demonstrate the imaging capability by looking at single layer graphene (SLG) deposited on a glass surface via chemical vapour deposition (CVD). Exploiting near-infrared femtosecond pulsed laser beams and saturation of the transient absorption, we can reach a resolution below λ/10 nm.