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1. (WO2018107142) POLARIZING BEAM SPLITTER FOR THZ RADIATION

Pub. No.:    WO/2018/107142    International Application No.:    PCT/US2017/065524
Publication Date: Fri Jun 15 01:59:59 CEST 2018 International Filing Date: Tue Dec 12 00:59:59 CET 2017
IPC: H01P 7/06
H01P 1/20
H01P 5/02
G02F 1/39
G02F 1/35
G02F 1/355
G01N 21/3586
G01N 21/3581
H01Q 13/08
Applicants: BROWN UNIVERSITY
OSAKA UNIVERSITY
Inventors: MENDIS, Rajind
NAGAI, Masaya
MITTLEMAN, Daniel M.
Title: POLARIZING BEAM SPLITTER FOR THZ RADIATION
Abstract:
A polarizing beam splitter includes thin electrically conductive metal sheets each having an edge and a thickness substantially less than the wavelength λ of a terahertz signal. The sheets are arranged in a stack or array to define wave propagation passages for energy of a terahertz beam directed at a face formed by edges of the sheets, and constitutes an artificial dielectric which operates below cutoff to allow selective transmission through the passages and/or reflection from said face, separating polarization states of the beam with defined power splitting. The artificial dielectric beam splitter can be configured to operate over a broad terahertz band. The sheets are flat, without micropatterned surface features, are robust and simple to manufacture, and form a broad band polarizing beam splitter for terahertz radiation. Complete separation of the transmitted and reflected beam is achieved below cutoff by rotating the polarization of the input beam.