Ultra-thin infrared metamaterial detector for multicolor imaging applications

Area of Science:

• Optics and Photonics
• Materials Science
• Infrared Technology

Background:

• Next-generation infrared imaging demands pixel-level control of electromagnetic processes like absorption and polarization.
• Metamaterial absorbers offer enhanced absorption and spectral information but often suffer from poor detection due to inefficient radiation focusing.

Purpose of the Study:

• To develop a multifunctional metamaterial absorber integrated with a novel ultra-thin detector for improved infrared detection.
• To enhance absorption and quantum efficiency in the mid-wave infrared (MWIR) and long-wave infrared (LWIR) spectrum.

Main Methods:

• Direct integration of a multifunctional metamaterial absorber with an ultra-thin (~λ/15) InAs/GaSb Type-II superlattice (T2SL) interband cascade detector.
• Design and demonstration of a deep sub-wavelength metamaterial detector architecture.

Main Results:

• Significantly improved detection quantum efficiency (QE) and absorption compared to conventional methods.
• Overcoming limitations of Fabry-Perot etalons in sub-wavelength detection regimes.
• Demonstrated wavelength-selective detection across the infrared spectrum.

Conclusions:

• Multifunctional metamaterials can be effectively integrated with advanced detectors for high-performance infrared imaging.
• The proposed architecture enables efficient spectral detection for enhanced multispectral infrared imaging applications.
• This work paves the way for low-latency, high-information-content infrared sensing systems.