Off-axis metallic diffractive lens for terahertz beams
Agnieszka Siemion , Andrzej Siemion , Michał Makowski , Maciej Sypek , Emilie H�rault , Fr�d�ric Garet , Jean-Louis Coutaz
AbstractA diffractive optical element for off-axis focusing of terahertz radiation is presented. It was designed in a nonparaxial regime and manufactured in a metal slab by laser cutting of curved stripes. The optical function of the structure includes focusing and deflecting the illuminating beam of a chosen frequency in a particular place. Therefore, the element acts as both a spatial and a spectral filter; hence it is especially suitable for separating the terahertz signal from a broadband thermal load in passive detection devices. The experimental evaluation of the proposed diffractive lens by means of time-domain spectroscopy is presented and discussed.
|Journal series||Optics Letters, ISSN 0146-9592, (A 40 pkt)|
|Keywords in English||Diffractive optics, Integrated optics devices, Spectroscopy, teraherz, Terahertz imaging|
|Publication indicators||= 21; = 21; : 2011 = 2.453; : 2011 = 3.399 (2) - 2011=3.387 (5)|
|Citation count*||25 (2020-01-01)|
* presented citation count is obtained through Internet information analysis and it is close to the number calculated by the Publish or Perish system.