A Distributed Terahertz Metasurface with Cold-Electron Bolometers for Cosmology Missions.

We developed and tested a 2D periodic array of cold-electron bolometers arranged into a wideband frequency selective metasurface that absorbs more than 70% of the incident power in the frequency range 100–800 GHz. The array had 10 × 10 unit cells, each containing four bolometers incorporated into a ring. The chip with bolometers was mounted on the back side of the silicon lens without a back-reflector. Preliminary experiments demonstrated voltage responsivity as high as 10⁹ V/W for the current-biased series array. Simulation of the noise performance shows realization of background noise-limited performance with NEP_tot < NEP_phot for the optical power load P₀ > 15 pW. Results of numerical simulation made for the unit cell of the array are presented together with the equivalent diagram based on lumped network elements. The unit cell also was developed numerically to operate in two radiation modes. [ABSTRACT FROM AUTHOR]