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. 2023 Mar 23;23(7):2496–2501. doi: 10.1021/acs.nanolett.2c04105

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© 2023 The Authors. Published by American Chemical Society

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Optical characterization of the focal length with pump light ON and OFF. (a, c) 2D intensity maps in the xz-plane with the pump intensities I_p = 0 μW/μm² and I_p = 110 μW/μm², respectively. (b, d) 2D intensity profile of the focal spot in its respective focal plane (xy) under the pump intensities I_p = 0 μW/μm² and I_p = 110 μW/μm², respectively. (e) Axial optical intensity distribution for the two pump intensities. (f) 1D cut of the focal spot across the y-axis for the two pump intensities (blue solid line for I_p = 0 μW/μm² and yellow dashed line for I_p = 110 μW/μm². The fwhm is highlighted by the blue shaded area. All intensity profiles are normalized to the maximum probe intensity for the given pump intensity.