Patent ID: 11888233
Assignee: RAMOT AT TEL-AVIV UNIVERSITY LTD.
Field: Measurement (Instruments)
Classification: CPC G  H | IPC G  H

Claim 19:
20. A method of providing a non-linear metasurface (NLM) comprising an array of point antennas excitable by a pump pulse of radiation to radiate THz radiation of a given spatiotemporal configuration to a far field of the NLM, the method comprising:
determining a first Fourier transform equal to a Fourier transform of the spatiotemporal THz radiation for a time shift to equal to a time it takes light to propagate from the NLM to a location having coordinates (x,z) where z is a distance along an optical axis of the NLM and x is a distance perpendicular to z;
determining a second Fourier transform equal to a Fourier transform of a time dependence of an electric field generated by a point antenna in the array responsive to the pump pulse for the time shift to and a time equal to (x/c)sin θ where θ=arctan(x/z) and c is the speed of light;
determining a spatial function equal to a quotient equal to the first Fourier transform divided by the second Fourier transform; and
using the spatial function to configure the array.