Flexible holographic metasurfaces for shape dependent imaging and curvature sensing

Jianling Xiao; Tomasz Plaskocinski; Robert I. Hunter; Mohammad Biabanifard; Duncan A. Robertson; Graham M. Smith; Simon Horsley; Sebastian A. Schulz; Andrea Di Falco

doi:10.1117/12.3016828

10 June 2024 Flexible holographic metasurfaces for shape dependent imaging and curvature sensing

Jianling Xiao, Tomasz Plaskocinski, Robert I. Hunter, Mohammad Biabanifard, Duncan A. Robertson, Graham M. Smith, Simon Horsley, Sebastian A. Schulz, Andrea Di Falco

Author Affiliations +

Proceedings Volume 12990, Metamaterials XIV; 1299005 (2024) https://doi.org/10.1117/12.3016828
Event: SPIE Photonics Europe, 2024, Strasbourg, France

Abstract

Flexible holographic metasurfaces offer significant versatility in optical imaging applications due to their ability to conform to non-flat objects and effectively manipulate optical properties. In this paper, we present the design, fabrication, and characterization of two functional imaging applications that utilize flexible holographic metasurfaces when the substrate radius of curvature is comparable to or much larger than the metasurfaces. For the first application, shape-dependent conformable holographic metasurfaces operate in the millimeter wavelength range. The images can be encoded with the target curvature and, more interestingly, the metasurface can encode two independent images within a single hologram. By bending the substrate to either a convex or concave shape, two switchable images can be revealed. The other application is a self-calibrated curvature sensor that operates in the visible range. The sensor consists of two distinct areas formed by metasurfaces that generate images of a two-dimensional reference scale and a dot image. The dot image acts as a displacement indicator and shifts within the scale as the metasurface deforms, providing an instant readout of the radius of curvature of an object that hosts the sensor on its surface, without the need for pre-calibration process. These two demonstrations expanded the use of metasurfaces for out-of-lab applications, particularly in tunable optomechanical sensors for radar and antennas, and in real-time curvature monitoring.

Conference Presentation

(2024) Published by SPIE. Downloading of the abstract is permitted for personal use only.

Citation Download Citation

Jianling Xiao, Tomasz Plaskocinski, Robert I. Hunter, Mohammad Biabanifard, Duncan A. Robertson, Graham M. Smith, Simon Horsley, Sebastian A. Schulz, and Andrea Di Falco "Flexible holographic metasurfaces for shape dependent imaging and curvature sensing", Proc. SPIE 12990, Metamaterials XIV, 1299005 (10 June 2024); https://doi.org/10.1117/12.3016828

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