BULLKID: Monolithic array of particle absorbers sensed by Kinetic Inductance Detectors

Abstract

We introduce BULLKID, an innovative phonon detector consisting of an array of dices acting as particle absorbers sensed by multiplexed Kinetic Inductance Detectors (KIDs). The dices are carved in a thick crystalline wafer and form a monolithic structure. The carvings leave a thin common disk intact in the wafer, acting both as holder for the dices and as substrate for the KID lithography. The prototype presented consists of an array of 64 dices of 5.4x5.4x5 mm${}^3$ carved in a 3" diameter, 5 mm thick silicon wafer, with a common disk 0.5 mm thick hosting a 60 nm patterned aluminum layer. The resulting array is highly segmented but avoids the use of dedicated holding structures for each unit. Despite the fact that the uniformity of the KID electrical response across the array needs optimization, the operation of 8 units with similar features shows, on average, a baseline energy resolution of $26\pm 7$ eV. This makes it a suitable detector for low-energy processes such as direct interactions of dark matter and coherent elastic neutrino-nucleus scattering.

References in corpus (5)

• Searching for low-mass dark matter particles with a massive Ge bolometer operated above-ground
• The NIKA2 large field-of-view millimeter continuum camera for the 30-m IRAM telescope
• Quasiparticle relaxation in optically excited high-Q superconducting resonators
• Position and energy-resolved particle detection using phonon-mediated microwave kinetic inductance detectors
• Final results of CALDER: Kinetic inductance light detectors to search for rare events

Cited by in corpus (9)

• Performance of a Kinetic Inductance Phonon-Mediated Detector at the NEXUS Cryogenic Facility
• Low-Energy Backgrounds in Solid-State Phonon and Charge Detectors
• Low-energy spectrum of the BULLKID detector array operated on surface
• Estimating the Energy Threshold of Phonon-mediated Superconducting Qubit Detectors Operated in an Energy-Relaxation Sensing Scheme
• Germanium target sensed by phonon-mediated kinetic inductance detectors
• Enhanced Athermal Phonon Responsivity in a Kinetic Inductance Detector with Integrated Phonon Collectors
• Probing Cosmic Neutrino Background through Parametric Fluorescence
• Magnetic field tunable spectral response of kinetic inductance detectors
• Direct Dark Matter searches with Metal Halide Perovskites