Multi-Channel High-Performance Absorber Based on SiC-Photonic Crystal Heterostructure-SiC Structure

Area of Science:

• Photonics
• Materials Science
• Infrared Optics

Background:

• Mid-infrared absorbers are crucial for various optical applications.
• Existing designs often lack tunability and multi-channel absorption capabilities.
• Silicon carbide (SiC) offers unique optoelectronic properties for infrared applications.

Purpose of the Study:

• To propose and theoretically investigate a novel SiC-photonic crystal (PhC) heterostructure-SiC structure for high-efficiency multi-channel mid-infrared absorption.
• To explore the underlying physical mechanisms responsible for the absorption characteristics.
• To demonstrate the tunability of the absorption peaks through structural and incident angle modifications.

Main Methods:

• Theoretical study of absorption characteristics using a SiC-photonic crystal (PhC) heterostructure-SiC design.
• Analysis of absorption peaks attributed to the coupling of dual Tamm phonon polariton (TPhP) modes and optical Tamm state (OTS) modes.
• Investigation of tunability by adjusting air dielectric layer thickness, PhC period, and incident angle for TE and TM polarized light.

Main Results:

• Achieved high-efficiency multi-channel absorption in the mid-infrared range.
• Demonstrated tunability of absorption peak position and intensity by modifying structural parameters.
• Showcased control over absorption peaks for TE/TM polarized light and epsilon-near-zero (ENZ) phonon polariton modes via incident angle adjustment.

Conclusions:

• The proposed SiC-PhC heterostructure-SiC structure is a promising platform for efficient and tunable mid-infrared light absorption.
• The absorption mechanism relies on the intricate coupling of TPhP and OTS modes.
• Potential applications include sensors, filters, modulators, switches, and thermal radiators.