Thermal conductance measurements for the development of ultra low-noise Transition-Edge Sensors with a new method for measuring the Noise Equivalent Power

摘要

Transition-Edge Sensors (TESs) are sensitive devices used in astronomical detectors. Recent projects in ground-based and space astronomy demand the Noise Equivalent Power (NEP) of the TES to be reduced to the limitsneeded for accurate measurements, for example, of the B-mode polarisation of the CMB. Thus, we have measuredthermal conductance of Si_xN_ybridges of various geometries, and present the results that give insight intothe phonon transport mechanism inside these low-dimensional structures. We also present a new method formeasuring the NEP of TESs using an on-chip black body radiator.