title: Direct rapid-prototyping fabrication of computer-generated volume holograms in the millimeter-wave and terahertz regime.
abstract: Computer-generated volume holograms (CGVHs) are gradient refractive index (GRIN) devices that consist of a superposition of multiple periodic diffraction gratings. Fabrication of these components for the visible range is difficult due to the small length-scale requirements but is more tenable in the terahertz (THz), as the length scales become more practical (≥ 10-5m). We successfully utilized polymer-based 3D additive rapid-prototyping technology to fabricate, to our knowledge, the world's first 3D THz CGVH in approximately 50 minutes, using $12 of consumables. This demonstration suggests that this technique could be extended to fabricate THz volumetric optics with arbitrary electromagnetic profiles.
authors.forename: Wei-Ren
authors.initials: WR
authors.lastname: Ng
authors.forename: Dathon R
authors.initials: DR
authors.lastname: Golish
authors.forename: Hao
authors.initials: H
authors.lastname: Xin
authors.forename: Michael E
authors.initials: ME
authors.lastname: Gehm
mesh_terms: D000465:Algorithms; D004867:Equipment Design; D019544:Equipment Failure Analysis; D006696:Holography / Q000295:instrumentation*; D007090:Image Interpretation, Computer-Assisted / Q000295:instrumentation* / Q000379:methods*; D021621:Imaging, Three-Dimensional / Q000295:instrumentation*; D008872:Microwaves; D010865:Pilot Projects; D055053:Terahertz Radiation