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Proposed TFLCFZL. (a) Phase profile of a harmonic diffractive lens. (b) Structure of the TFLCFZL with harmonic diffractive lens.
Fabrication procedure of the TFLCFZL. (a) Coating UV curable prepolymer and stamp making. (b) Structure copy by UV imprinting. (c) Sputtering conductive layer. (d) Assembling TFLCFZL.
Portion of three dimensional image of the 12 levels harmonic diffractive lens.
POM images of the TFLCFZL at (a) V = 2.4 Vrms, (b) V = 4.0 Vrms. The LC cell is sandwiched between two orthogonal polarizers.
Diffraction efficiency of a 2 mm-diameter TFLCFZL at three focus lengths 45.8 mm, 30.5 mm, and 22.1 mm, respectively. Illumination wavelength is 632.8 nm.
Images taken from different image planes of the TFLCFZL by employing different focal lengths. (a) F −1 = 45.8 mm, V = 7.2 Vrms, (b) F 0 = 30.5 mm, V = 4.8 Vrms, (c) F 1 = 22.1 mm, V = 3.4 Vrms.
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