Suppression of electromagnetic crosstalk in kinetic inductance detector arrays by redesigning the pixel arrangement

Superconducting kinetic inductance detectors (KIDs) are considered to be a most promising technique for the large-scale imaging of millimeter and submillimeter wave in astronomy. With the increasing of the pixel density and the array size, the electromagnetic crosstalk becomes an inevitable problem, which prevents the increasing of multiplexing during the development of larger KIDs arrays. In this work, an effective method is introduced to suppress the electromagnetic crosstalk to achieve a compact pixel distribution and a dense frequency interval. The electromagnetic crosstalk is firstly analyzed by the simulation between two neighboring pixels, the physical distance and the frequency interval are optimized. Then the distribution of pixels on a whole array is rearranged to satisfy the requirements using a genetic algorithm. The normalized electromagnetic crosstalk can be reduced to 0.5% from the simulation on an 8×8 array. Larger arrays of 16×16 pixels have been fabricated and measured to validate this method, the results reveal that both the resonance property and survival rate of pixels are improved effectively with this method. This method will be very helpful for designing high-multiplexing KIDs arrays within a limited bandwidth.