Within optical systems, Infrared (IR) detectors are a key focus of research because of the need for low-power, high-performance, versatile devices. In this context, many works presented plasmonic nanostructures as candidates for next-generation detectors. Conventional IR technologies are limited by a trade-off between system requirements and performance. Microbolometers exploit thermal phenomena; they operate at room temperature but suffer from slow response and low sensitivity. Meanwhile, semiconductor detectors offer superior performance but require cryogenic cooling, since their working principle relies on the photoelectric effect. This work explores an alternative approach based on plasmonic nanoantennas engineered for Schottky-mediated electron emission. Electromagnetic and thermal simulations led to the design of new geometries, whose properties have been optimized for resonance conditions, field enhancement, and thermal hotspot formation.