Electrical and Electronic Engineering - Research Publications

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Multicolor hologram based on plasmonic nanohole arrays and detour phase: design and simulation

Khaleghi, SSM ; Wen, D ; Cadusch, J ; Crozier, KB (IEEE, 2021)

Multicolor holograms have numerous applications, including in art, data storage, security, and advanced displays. In recent years, there has been much interest concerning multicolor holograms based on metasurfaces [1]. Wen et al [2] demonstrated multicolor holograms using dielectric nanoparticles, with the nanoparticle size defining its resonant wavelength and its position defining its phase via the detour phase concept [3]. While this approach worked, it required good control over nanoparticle size and shape, achieved using inductively coupled reactive ion etching (ICP-RIE). This motivates the development of multicolor metasurface holograms that are also based on detour phase, but using other nanostructure types. Here we show that arrays of nanoholes in aluminum films enable the realization of multicolor holograms. We design nanohole arrays that serve as color (i.e. red/green/blue) filters with high transmission and low cross-talk. We then design two multicolor holograms based on these filters and simulate their performance, demonstrating that they show good fidelity to the desired holographic images. Our device is based on aluminum and silicon dioxide, giving it the advantage of CMOS compatibility.