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Terahertz and sub-terahertz band detection has a key role both in fundamentalinteractions physics and technological applications, such as medical imaging,industrial quality control and homeland security. In particular, transitionedge sensors (TESs) and kinetic inductance detectors (KIDs) are the mostemployed bolometers and calorimeters in the THz and sub-THz band forastrophysics and astroparticles research. Here, we present the electronic,thermal and spectral characterization of an aluminum/copper bilayer sensingstructure that, thanks to its thermal properties and a simple miniaturizeddesign, could be considered a perfect candidate to realize an extremelysensitive class of nanoscale TES (nano-TES) for the giga-therahertz band.Indeed, thanks to the reduced dimensionality of the active region and theefficient Andreev mirror (AM) heat confinement, our devices are predicted toreach state-of-the-art TES performance. In particular, as a bolometer thenano-TES is expected to have a noise equivalent power (NEP) of$5\times10^{-20}$ W/$\sqrt{\mathrm{Hz}}$ and a relaxation time of $\sim 10$ nsfor the sub-THz band, typical of cosmic microwave background studies. Whenoperated as single-photon sensor, the devices are expected to show a remarkablefrequency resolution of 100 GHz, pointing towards the necessary energysensitivity requested in laboratory axion search experiments. Finally,different multiplexing schemes are proposed and sized for imaging applications.

Development of highly sensitive nanoscale transition edge sensors for gigahertz astronomy and dark matter search