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We present details of the design, simulation, and initial test results ofprototype detectors for the fourth-generation receiver of the South PoleTelescope (SPT). Optimized for the detection of key secondary anisotropies ofthe cosmic microwave background (CMB), SPT-3G+ will measure the temperature andpolarization of the mm/sub-mm sky at 220, 285, and 345 GHz, beyond the peak ofthe CMB blackbody spectrum. The SPT-3G+ focal plane will be populated withmicrowave kinetic inductance detectors (MKIDs), allowing for significantlyincreased detector density with reduced cryogenic complexity. We presentsimulation-backed designs for single-color dual-polarization MKID pixels ateach SPT-3G+ observation frequency. We further describe design choices made topromote resonator quality and uniformity, enabling us to maximize the availablereadout bandwidth. We also discuss aspects of the fabrication process thatenable rapid production of these devices and present an initial darkcharacterization of a series of prototype devices.

Development of MKIDs for measurement of the Cosmic Microwave Background with the South Pole Telescope