Microwave and terahertz wave sensing with metamaterials

Area of Science:

• Physics
• Materials Science
• Electrical Engineering

Background:

• Far-infrared detection is crucial for various applications, including astronomy and security.
• Existing detectors often face limitations in sensitivity, speed, or operating frequency.
• Metamaterials offer unique electromagnetic properties for novel detector designs.

Purpose of the Study:

• To design, fabricate, and characterize metamaterial-enhanced bimaterial cantilever pixels for far-infrared detection.
• To demonstrate the frequency agility and high responsivity of these novel detector pixels.
• To establish a new technique for sensitive detection in the far-infrared spectrum.

Main Methods:

• Integration of split-ring resonators (SRRs) onto bimaterial cantilever pixels.
• Utilizing local heating from absorbed far-infrared radiation to induce mechanical deflection.
• Detection of mechanical deflection using a visible light readout system.
• Characterization of pixel performance at different frequencies (95 GHz and 693 GHz).

Main Results:

• Successful fabrication of metamaterial-enhanced bimaterial cantilever pixels.
• Demonstrated highly responsive pixels capable of far-infrared detection.
• Achieved single-pixel responsivities up to 16,500 V/W.
• Obtained noise equivalent powers as low as 10⁻⁸ W/Hz¹/².
• Showcased frequency agility of the detection technique.

Conclusions:

• Metamaterial-enhanced bimaterial cantilevers are a promising technology for far-infrared detection.
• The developed technique offers high sensitivity and frequency tunability.
• These first-generation devices represent a significant advancement in far-infrared detector technology.