Pixel position recognition and imaging of MKID array based on LED dot matrix radiation

Microwave kinetic inductance detectors (MKIDs) are promising low-temperature superconducting detectors because of high sensitivity, easy frequency-domain multiplexing (FDM) readout, and simple structure for large-format arrays. Each pixel of the MKID array is a microwave resonator, and the FDM technology makes the resonant frequencies of all resonators read out by one feedline. However, there are often crossovers, missing, and overlapping phenomena between resonance curves. As a prerequisite for imaging, it is necessary to confirm the correspondence between the resonance frequency point and the physical position of the pixel. In this paper, by designing and using an 8×8 LED dot matrix, a fast pixel recognition of an 8×8 MKID array is realized. In addition, the I-V characteristics of the AlGaInP red Light-emitting diode (LED) used in the experiment at different low temperatures are characterized. Finally, through the MKID that has achieved pixel positioning, and the image of LED multi-point lighting is obtained.