Micromechanical Bolometers for Subterahertz Detection at Room Temperature

Area of Science:

• Physics
• Materials Science
• Electrical Engineering

Background:

• Fast room-temperature imaging at terahertz (THz) and subterahertz (sub-THz) frequencies is crucial for applications in security, healthcare, and industrial production.
• Existing technologies often face limitations in speed, operating temperature, or cost.

Purpose of the Study:

• To introduce novel micromechanical bolometers based on silicon nitride trampoline membranes.
• To evaluate their performance as broad-range detectors for sub-THz frequencies at room temperature.

Main Methods:

• Fabrication of micromechanical bolometers utilizing silicon nitride trampoline membranes.
• Characterization of detector performance, including noise-equivalent power (NEP) and operational speed, at room temperature and down to sub-THz frequencies.

Main Results:

• The developed bolometers function effectively as broad-range detectors down to sub-THz frequencies.
• At longer wavelengths, room-temperature noise-equivalent powers were comparable to state-of-the-art commercial devices (approximately 100 pW Hz^-1/2).
• The devices exhibit good operational speed and are amenable to easy, large-scale fabrication.

Conclusions:

• Silicon nitride trampoline membrane bolometers are a promising technology for room-temperature THz imaging.
• Their performance, speed, and fabrication scalability suggest they could be a cost-effective solution for various THz applications.
• This technology has the potential to become a leading candidate for future low-cost THz imaging systems.