Electrically Controlled Metal-Insulator Heterogeneous Evolution for Infrared Switch and Perfect Absorption.

Area of Science:

• Optoelectronics
• Materials Science
• Infrared Photonics

Background:

• Active switching is crucial for reconfigurable infrared photonic systems.
• Metamaterials offer solutions but are complex to fabricate.
• Planar layered structures provide a simpler, scalable alternative.

Purpose of the Study:

• To demonstrate an electrically controlled reversible infrared switch.
• To utilize a single layer of perovskite nickelate for active switching.
• To achieve giant tunability and effective modulation mechanisms.

Main Methods:

• Fabrication of a single-layer perovskite nickelate device on an opaque substrate.
• Electrical triggering of a proton-mediated metal-to-insulator transition.
• Characterization of optical properties, including reflectivity and absorption.

Main Results:

• Achieved reversible switching between high (R ≈0.74) and low (R ≈0.09) reflectivity states (λ = 7-10 µm).
• Demonstrated temperature-independent perfect absorption (A > 0.99) in a partially hydrogenated state (λ = 11.6-12.1 µm).
• Observed significant emissivity modulation (≈0.623) across a broad infrared range (λ = 7-14 µm).

Conclusions:

• The perovskite nickelate device offers a simple, scalable solution for active infrared switching.
• Electrically controlled proton-mediated transition enables tunable optical properties.
• The demonstrated switching behavior is suitable for adaptive infrared applications.