Patent ID: 11899316
Assignee: NAGAOKA UNIVERSITY OF TECHNOLOGY
Field: Optics (Instruments)
Classification: CPC G  C | IPC G

Claim 0:
1. A terahertz wave control element comprising:
(A) a first flat plate comprising:
(A1) a first substrate capable of transmitting a terahertz wave;
(A2) a first electrode capable of transmitting a terahertz wave, formed on the first substrate; and
(A3) a first liquid crystal alignment film capable of transmitting a terahertz wave, formed on the first electrode;
(B) a second flat plate comprising:
(B1) a second substrate capable of transmitting a terahertz wave;
(B2) a second electrode capable of transmitting a terahertz wave, formed on the second substrate; and
(B3) a second liquid crystal alignment film capable of transmitting a terahertz wave, formed on the second electrode; and
(C) a liquid crystal located in a space formed by locating the (A) first flat plate and the (B) second flat plate to be parallel to each other with a predetermined distance therebetween so that the first and second liquid crystal alignment films are located to be opposite each other,
wherein (D1) when no voltage is applied, the terahertz wave control element has a first portion in which the liquid crystal is aligned in a first direction parallel to the (A) first flat plate and the (B) second flat plate, and a second portion in which the liquid crystal is aligned in a second direction orthogonal to the first direction and parallel to the (A) first flat plate and the (B) second flat plate,
(D2) the first portion has a first width, the second portion has a second width, and the first and second portions are disposed adjacent to each other and alternately disposed in a predetermined cycle,
(D3) when a voltage is applied, the liquid crystal in each of the first portion and the second portion is aligned in a direction orthogonal to the (A) first flat plate and the (B) second plate, and
(E) a terahertz wave transmitted through the terahertz wave control element results in a phase change independent on a state of polarization.