School of Physics - Research Publications

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Author: Roberts, Ann × Start date: 2018 × Type: Conference Paper ×

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    On-chip optical image processing with plasmonic metasurfaces
    Wesemann, L ; Davis, T ; Roberts, A (IEEE, 2020)
    We propose the utilization of plasmonic resonant wave-guide gratings for ultracompact image processing in transmission. We experimentally demonstrate two-dimensional edge-detection in amplitude images and contrast enhancement of images of biological samples.
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    Optical Metasurfaces for Processing of Amplitude and Phase Images
    Wesemann, L ; Rickett, J ; Song, J ; Davis, TJ ; Roberts, A (Optica Publishing Group, 2021)
    We investigate the utilization of plasmonic resonant waveguide gratings for all-optical image processing in transmission. We experimentally demonstrate edge-detection in amplitude- as well as phase images and contrast enhancement of images of biological samples.
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    Plasmonic Metasurfaces for Optical Information Processing
    Wesemann, L ; Panchenko, E ; Singh, K ; Gomez, DE ; Davis, TJ ; Roberts, A ; Simpson, MC ; Juodkazis, S (SPIE-INT SOC OPTICAL ENGINEERING, 2019-01-01)
    Optical spatial frequency filtering is a key method for information processing in biological and technical imaging. While conventional approaches rely on bulky components to access and filter the Fourier plane content of a wavefield, nanophotonic approaches for spatial frequency filtering have recently gained attention. Here computational and experimental progress towards the design and demonstration of metasurfaces with spatial frequency filtering capability for optical image processing will be presented. Using the example of a metasurface consisting of radial rod trimers we demonstrate its potential to perform edge enhancement in an amplitude image and conversion of phase gradients in a wavefield into intensity modulations. The presented results indicate a potential avenue for ultra-compact image processing devices with applications in biological live-cell imaging.
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    Scalable and Consistent Fabrication of Plasmonic colors via Nanoimprint Lithography
    Shahidan, MFS ; Song, J ; James, TD ; Mulvaney, P ; Roberts, A ; Simpson, MC ; Juodkazis, S (SPIE-INT SOC OPTICAL ENGINEERING, 2019-01-01)
    We utilised thermal and UV-assisted Nanoimprint Lithography (NIL) i.e. thermal and UV-assisted to produce plasmonic coloration, and compare their ability for scalable fabrication. Several designs are presented and we show the generated colors are dependent on their geometry and the direction of polarisation of incident illumination. Finally, we demonstrated UV-NIL for consistent production of large-area (0.6×0.4 cm2) plasmonic color with extended color gamut.
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    Tuning the asymmetric response of metasurfaces for optical spatial filtering
    Davis, TJ ; Eftekhari, F ; Gomez, DE ; Roberts, A ; Mitchell, A ; RubinszteinDunlop, H (SPIE-INT SOC OPTICAL ENGINEERING, 2019-01-01)
    The spatial filtering of optical signals has been demonstrated previously with metasurface thin-films created from arrays of structured optical elements. We consider the problem of changing the symmetry of their response with changes to the in-plane wavevector kI→-kI and show it can be tailored or even dynamically tuned. Our work is based on a general theory of metasurfaces constructed from non-diffracting arrays of coupled metal particles. We present the optical transfer function of such a metasurface, identify the physical properties essential for asymmetry and demonstrate its behaviour experimentally.