Theory and application of temporal coupling mode for a SiC/CaF₂/Ag cell-based grating

Area of Science:

• Nanophotonics and Metamaterials
• Thermal Engineering
• Computational Physics

Background:

• Spectral thermal radiation properties are crucial for functional emitters and devices.
• Predicting properties of structures with multiple resonances is challenging due to complex mode coupling.
• Micro/nanoscale-patterned structures offer a route to tailor thermal radiation.

Purpose of the Study:

• To develop a fast and accurate algorithm for predicting thermal radiation properties of structures with multiple resonances.
• To establish a temporal coupling mode (TCM) model for SiC/CaF2/Ag cell-based gratings.
• To investigate the enhancement of narrowband absorption through multiple-resonance coupling.

Main Methods:

• Extraction of intrinsic parameters and coupling constants of resonances.
• Development and application of a temporal coupling mode (TCM) model.
• Verification of the TCM model's accuracy and efficiency for absorption spectra prediction.

Main Results:

• The temporal coupling mode (TCM) model accurately predicts absorption spectra of SiC/CaF2/Ag gratings.
• Multiple-resonance coupling effects enhance the narrowband absorption of the gratings.
• The model demonstrates efficiency in handling complex mode coupling.

Conclusions:

• The developed TCM model provides a reliable tool for predicting absorption characteristics of complex nanostructures.
• This work facilitates the design of functional emitters and devices with tailored spectral thermal radiation properties.
• Understanding and controlling resonance coupling is key to optimizing thermal radiation performance.