Diffractive paper lens for terahertz optics.
Passive terahertz (THz) setups require optical elements with large diameters for optimal harvesting of weak signals. High f-number implies sophisticated aspheric designs to ensure optimal resolution and good energetic efficiency. Trial and error testing of such optics is expensive and numerical modeling is time consuming; hence, we propose extremely cheap diffractive lenses for THz made of regular paper. They are easy to manufacture even with large diameters, and the optical function can be easily customized, which can be used for initial experimental testing of THz setups. Characterization of the proposed diffractive lenses with time-domain spectroscopy is presented and discussed.
Faculty of Physics, Warsaw University of Technology, Koszykowa 75, Warsaw 00 662, Poland.
Agnieszka
A
Siemion
Andrzej
A
Siemion
Michał
M
Makowski
Jarosław
J
Suszek
Jarosław
J
Bomba
Adam
A
Czerwiński
Frédéric
F
Garet
Jean-Louis
JL
Coutaz
Maciej
M
Sypek