US 11,705,639 B2
Artificial dielectric isolator for THz radiation
Rajind Mendis, Providence, RI (US); Masaya Nagai, Osaka (JP); and Daniel M. Mittleman, Providence, RI (US)
Assigned to Brown University, Providence, RI (US)
Appl. No. 16/494,221
Filed by BROWN UNIVERSITY, Providence, RI (US)
PCT Filed Mar. 13, 2018, PCT No. PCT/US2018/022158
§ 371(c)(1), (2) Date Sep. 13, 2019,
PCT Pub. No. WO2018/169940, PCT Pub. Date Sep. 20, 2018.
Claims priority of provisional application 62/474,301, filed on Mar. 21, 2017.
Claims priority of provisional application 62/470,685, filed on Mar. 13, 2017.
Prior Publication US 2021/0184363 A1, Jun. 17, 2021
Int. Cl. H01Q 15/24 (2006.01); G02B 5/30 (2006.01); G02B 27/28 (2006.01)
CPC H01Q 15/242 (2013.01) [G02B 5/3008 (2013.01); G02B 5/3058 (2013.01); G02B 27/285 (2013.01)] 3 Claims
OG exemplary drawing
 
1. A device comprising a quarter wave plate (QWP) fabricated with an artificial dielectric formed of thin spaced-apart metal plates,
wherein plates define orientation of a plane at 45° to an input vertical polarization of a process beam from a polarizing beam splitter (PBS) fabricated using artificial dielectrics,
such that half of an input energy will propagate via a TEM mode and another half via a TE1 mode such that two orthogonal polarization components acquire a one-pass relative phase of 90° at a certain frequency and a return pass relative phase of 180° upon passing back to effectively rotate a polarization axis of a reflected beam by 90°, rendering it horizontally polarized, so it is diverted in an off-axis direction by the PBS and isolated from an input-beam path, the QWP given a 12-degree tilt with respect to a beam axis.