title: Dip-in depletion optical lithography of three-dimensional chiral polarizers.
abstract: We combine the concepts of dip-in and stimulated-emission-depletion-inspired optical lithography for the first time to fabricate three-dimensional (3D) nanostructures for photonics. For depletion of the photoinitiator ITX we employ a fiber-coupled laser diode at 639 nm wavelength. To demonstrate the performance of the experimental setup, we have fabricated 3D chiral layer-by-layer twisted woodpile structures with a lattice constant reduced by more than a factor of 2 compared to earlier results. The fabricated chiral photonic crystals serve as dual-band polarizers for circular polarization at visible and telecom wavelengths. Spectroscopic measurements agree well with scattering-matrix calculations.
authors: Michael
authors: M
authors: Thiel
authors: Julian
authors: J
authors: Ott
authors: André
authors: A
authors: Radke
authors: Johannes
authors: J
authors: Kaschke
authors: Martin
authors: M
authors: Wegener