An optical fiber probe, based on spherical coupling of light energy, is proposed to transform the lateral displacement of a spherical coupler into the deflection of a light energy center, while the light energy is transmitted in the reverse direction. Therefore, the shadowing effect of a microcavity can be eliminated. The probe has a high displacement sensitivity, allowing precision inner-dimension measurements of microstructures with high aspect ratios. Measurements of microholes and fuel injection nozzles indicate that, for a microstructure with an aspect ratio of up to $15:1$ , a probing force $<1\mathrm{\mu N}$ , a resolution of up to $0.05\mathrm{\mu m}$ can be achieved using the proposed probe, which is easy to exchange and low cost.

© 2011 Optical Society of America

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