Micrometer-accuracy 2D displacement interferometer with plasmonic metasurface resonators

Chuanrui Guo, Yuchao Zhang, Matthew Klegseth, Jie Gao, Genda Chen

Research output: Journal article publicationJournal articleAcademic researchpeer-review

Abstract

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%.

Original languageEnglish
Pages (from-to)6474-6477
Number of pages4
JournalChinese Optics Letters
Volume45
Issue number23
DOIs
Publication statusPublished - 1 Dec 2020

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Atomic and Molecular Physics, and Optics
  • Electrical and Electronic Engineering

Cite this