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Applying Energy Absorption Interferometry to THz direct detectors using photomixers
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Applying Energy Absorption Interferometry to THz direct detectors using photomixers
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Paper
Applying Energy Absorption Interferometry to THz direct detectors using photomixers
2023
Overview
Detector requirements for far infrared astronomy generally result in devices which exhibit a few-moded response to incident radiation. The sensitivity and spatial form of the individual modes to which such a detector is sensitive can be determined with knowledge of the complex valued cross-spectral density of the system, which we label the detector response function (DRF). A matrix representing the discretized cross-spectral density can be measured from the complex amplitudes of interference fringes generated by two identical sources as they are independently scanned through the field of view. We provide experimental verification of this technique using monochromatic THz beams generated by photomixers in which the relative phase is varied with fiber stretchers. We use this system to characterize the modal response of a single pixel from an array of microwave kinetic inductance detectors (MKIDs).
Publisher
Cornell University Library, arXiv.org
