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Fabrication of the 3D-printed phase plates

CL Changming Liu
JL Jinsong Liu
LN Liting Niu
XW Xuli Wei
KW Kejia Wang
ZY Zhengang Yang
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Based on Equation (3) above, we obtain the CAD models of the required diffractive phase plates. Then a commercial 3D printer (Objet 30 series, Stratasys Ltd.), having a printing resolution of 600 dpi (42 μm) in the xy-plane and 900 dpi (28 μm) along the z-axis, is utilized to fabricate these phase plates. The 3D printing material is a rigid opaque material (VeroWhitePlus), whose optical properties are characterized with a Zomega-Z3 THz time-domain spectrometer (THz-TDS) before the fabrication process. At the frequency of 0.3 THz, the refractive index and the absorption coefficient of the printing material are about 1.655 and 1.5 cm−1, respectively.

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