Comparison of large area and lumped element field-effect transistors for broadband detection of Terahertz

We compare Terahertz detection by large-area to antenna coupled lumped element field-effect transistors (FETs). The large radiation resistance of R_a=72 Ω of the antenna coupled device improves the responsivity by a factor of 150 as compared to the antenna-less large area device. The LA-FET is an order of magnitude more sensitive than expected from theory.