Characterize Thermal Boundary Resistance Between A Superconducting Nanowire And A Substrate And The Evolution Of The Substrate Surfaces Under Ion Beam Figuring

Superconducting nanowires have been used for making various thermal response superconducting detectors.For those detectors,a local hotspot,where the nanowire switches from the superconducting state to a normal state is created after photon absorption.Therefore,the thermal transport mechanism plays a key role with respect to the device performance,for instance,limiting device recovery time.We present the latching effect of a superconducting nanowire once thermal recovery time becomes longer than the current recovery time in the simulation using the electro-thermal model.Then the acoustic mismatch model(AMM)is introduced and applied in calculating the boundary heat-transfer coefficient between a superconducting nanowire and a substrate with the data obtained from hysteresis currents of ?-? curves.At last,we introduce ion beam figuring(IBF)in surface smoothing technology,and we successfully improved the superconducting property by smoothing the interface between a nanowire and the substrate.