Tuning the asymmetric response of metasurfaces for optical spatial filtering
Timothy J Davis, Fatima Eftekhari, Daniel E Gomez, Ann Roberts, A Mitchell (ed.), H RubinszteinDunlop (ed.)
Proceedings of SPIE | SPIE-INT SOC OPTICAL ENGINEERING | Published : 2019
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.
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Awarded by Australian Research Council
This work was performed in part at the Melbourne Centre for Nanofabrication (MCN) in the Victorian Node of the Australian National Fabrication Facility (ANFF). The authors acknowledge funding through the Australian Research Council Discovery Projects Scheme (DP160100983) and Future Fellowship Scheme (FT140100514).