Flexible holographic metasurfaces
Abstract
Metasurface holography has attracted much attention in recent years because of its practical applications including anti-counterfeiting, sensing, and lensing. However, most metasurface holograms have been constrained to rigid substrates which limit their out-of-the-lab value. Flexible holographic metasurfaces offer increased post-fabrication tunability as they can be bent or stretched, can be conformed to real-world non-flat surfaces, and are compatible with commercially viable roll-to-roll fabrication methods.
This thesis describes how flexible holographic metasurfaces can be fabricated, their utility, and the novel phenomena that arise from them. In particular, it details a hologram retrieval algorithm for non-flat surface topologies, and how the topography determines the resultant symmetry properties of the holographic image. Furthermore, this thesis outlines a concept for replacing the bulky and complicated optics required for light sheet fluorescent microscopy with a simple holographic metasurface illuminated by a collimated beam.
Two plasmonic meta-atom designs, both operating in reflection, are presented here, one for the visible wavelength range using nanorods and Pancharatnam-Berry phase-shifting, and the other for the millimetre wavelength range using c-rings.
Extending the tools available for holography paves-the-way for advances in this field.
Type
Thesis, PhD Doctor of Philosophy
Collections
Description of related resources
Flexible holographic metasurfaces (Thesis data) Burch, J., University of St Andrews, 2019. DOI: https://doi.org/10.17630/5959f528-af12-427e-b788-b335f8e42fa3Related resources
https://doi.org/10.17630/5959f528-af12-427e-b788-b335f8e42fa3Items in the St Andrews Research Repository are protected by copyright, with all rights reserved, unless otherwise indicated.