Fig. 2 | Optical and Quantum Electronics

Fig. 2

From: Planar efficient metasurface for generation of Bessel beam and super-resolution focusing

Fig. 2

a Schematic 2D diagram of designed Plane-axicon. The Plane-axicon deflects an incident light to an angleβtoward its center to generate Bessel beams. The Plane-axicon is composed of identical TiO2 nanofins but different rotation angle with respect to its geometrical center. The Plane-axicon is designed at wavelength \(\lambda = 532nm\) with dimensions (L = 210 nm, W = 70 nm, H = 600 nm, P = 240 nm). b, c Maps of the transmission and phase of the unite cell as a function of the nanofin length and wavelength. d Transmittance and phase shift curves of the selected nanofin in the design. e The schematic of unit cell. θ is the each unit cell rotation degree to generate Bessel beam. f, g The transmission and phase shift curves of unit cell rotated angle 0, 15, 30, 45, 60, 75 and 90 degree. h Schematic view of designed plane-axicon model

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