METHODS FOR GENERATING AND CONTROLLING TERAHERTZ RADIATION

    公开(公告)号:US20230185116A1

    公开(公告)日:2023-06-15

    申请号:US17925027

    申请日:2021-05-14

    CPC classification number: G02F1/0136 H01Q9/02 G02F2203/13

    Abstract: Apparatus for generating THz (teraftertz) radiation, the apparatus comprising: a substrate; a planar array of subwave-length antennas formed on the substrate having rotational symmetry, Cn, of order “n” greater than or equal to 3 and rotational symmetry cycle 2π/η, which are excitable by near infrared (NIR)_pump radiation to radiate THz radiation having wavelengths that are substantially larger than characteristic dimensions of the subwavelength antenna; wherein the array comprises a plurality of sections each comprising plurality of subwavelength antennas exhibiting a spatial pattern different from that of an adjacent section of the plurality of sections.

    Response shaping by multiple injection in a ring-type structure

    公开(公告)号:US11677215B2

    公开(公告)日:2023-06-13

    申请号:US17408592

    申请日:2021-08-23

    CPC classification number: H01S5/1003 H01S5/1028 H01S5/124 H01S5/0608

    Abstract: Structures for response shaping in frequency and time domain, include an optical response shaper and/or a modulator device with multiple injection. The device comprises a resonator having an enclosed geometric structure, for example a ring or racetrack structure, at least two injecting optical waveguides approaching the resonator to define at least two coupling regions between the resonator and the injecting waveguides, and may define at least two Free Spectral Range states.
    One or both of the coupling regions has a coupling coefficient selected for a predetermined frequency or time response, and the coupling coefficient or other device parameters may be variable, in some case in real time to render the response programmably variable.

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