Micrometer-Accuracy 2D Displacement Interferometer with Plasmonic Metasurface Resonators
In this Letter, a high-accuracy, two-dimensional displacement sensor is proposed, designed, and demonstrated based on the concept of an extrinsic Fabry–Perot Interferometer. The sensor is composed of two bundled single-mode optic fibers in parallel and two plasmonic metasurface resonators inscribed on a gold substrate via a focused ion beam. The fiber end surface and the metasurface are in parallel with a small cavity between. The cavity change or Z-component displacement is determined from the pattern of interference fringes. The X-component displacement, perpendicular to the Z component, is identified from wavelength-selective metasurface resonators, which possess unique resonant wavelengths due to different nanostructure designs. The sensor was calibrated with six displacements applied through a three-axis precision linear stage. Test results indicated that the proposed interferometer can measure displacements with a maximum error of 5.4 µm or 2.2%.
C. Guo et al., "Micrometer-Accuracy 2D Displacement Interferometer with Plasmonic Metasurface Resonators," Chinese Optics Letters, vol. 45, no. 23, pp. 6474-6477, Optical Society of America (OSA), Dec 2020.
The definitive version is available at https://doi.org/10.1364/OL.412130
Mechanical and Aerospace Engineering
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01 Dec 2020