Omnidirectional transformation-optics cloak made from lenses and glenses

We present a design for an omni-directional transformation-optics (TO) cloak comprising thin lenses and glenses (generalised thin lenses) [Chaplain et al., J. Opt. Soc. Am. A (in press, 2016)]. It should be possible to realise such devices in pixellated form. Our design is a piecewise non-affine generalisation of piecewise affine pixellated-transformation-optics devices [Oxburgh et al., Proc. SPIE 9193, 91931E (2014) and J. Opt. (in press, 2016)]. It is intended to be a step in the direction of TO devices made entirely from lenses, which should be readily realisable on large length scales and for a broad range of wavelengths