Terahertz detection assembly and methods for use in detecting terahertz radiation

    公开(公告)号:US09766127B2

    公开(公告)日:2017-09-19

    申请号:US13942656

    申请日:2013-07-15

    CPC classification number: G01J3/42 G01N21/3581 G01R23/17

    Abstract: A terahertz detection assembly generally has a light generating apparatus configured to generate at least one illuminating light pattern and a substrate member positioned proximate to the light generating apparatus. The substrate member includes a semiconductive portion configured to receive at least a portion of the illuminating light pattern such that a conductive path is defined within the semiconductive portion. At least one waveguide is coupled to the semiconductive portion such that the waveguide is adjacent to the conductive path. The waveguide is configured to receive at least a portion of the illuminating light pattern such that the pattern is moving along the waveguide. The waveguide is further configured to receive a plurality of terahertz electromagnetic waves that are transmitted within the waveguide in the same direction as the motion of the illuminating light pattern to facilitate the detection and characterization of the terahertz electromagnetic waves.

    FREQUENCY HOPPING SPREAD SPECTRUM (FHSS) FOURIER TRANSFORM SPECTROSCOPY

    公开(公告)号:US20170138847A1

    公开(公告)日:2017-05-18

    申请号:US15319313

    申请日:2015-06-16

    CPC classification number: G01N21/3586 G01J3/10 G01J3/42 G01N2021/3595

    Abstract: Apparatus and techniques for broadband Fourier transform spectroscopy can include frequency hopping spread-spectrum spectroscopy approaches. For example, an excitation source power can be spread over a specified frequency bandwidth, such as by applying a sequence of short, transform-limited pulses to a sample. Each pulse can include a specified carrier frequency, and a corresponding bandwidth of the individual pulse can be determined by a frequency domain representation when Fourier transformed. A series of short excitation pulses can be used to create an excitation sequence, such as to deliver a specified or desired amount of power to the sample, such as by having the excitation source enabled for a time comparable to a free induction decay (FID) dephasing time.

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