title: A Nipkow disk integrated with Fresnel lenses for terahertz single pixel imaging.
abstract: We present a novel Nipkow disk design for terahertz (THz) single pixel imaging applications. A 100 mm high resistivity (ρ≈3k-10k Ω·cm) silicon wafer was used for the disk on which a spiral array of twelve 16-level binary Fresnel lenses were fabricated using photolithography and a dry-etch process. The implementation of Fresnel lenses on the Nipkow disk increases the THz signal transmission compared to the conventional pinhole-based Nipkow disk by more than 12 times thus a THz source with lower power or a THz detector with lower detectivity can be used. Due to the focusing capability of the lenses, a pixel resolution better than 0.5 mm is in principle achievable. To demonstrate the concept, a single pixel imaging system operating at 2.52 THz is described.
authors.forename: Chong
authors.initials: C
authors.lastname: Li
authors.forename: James
authors.initials: J
authors.lastname: Grant
authors.forename: Jue
authors.initials: J
authors.lastname: Wang
authors.forename: David R S
authors.initials: DR
authors.lastname: Cumming