Advances in Infrared Radiation Modulation Technology

Infrared radiation modulation technology has profoundly impacted various aspects of human life, including thermal management, imaging, sensing, camouflage, and thermal imaging. The objective of this topical collection is to present the latest advancements in research and industry developments concerning infrared radiation modulation.

Infrared radiation is a ubiquitous natural occurrence, where all objects with temperatures above absolute zero can emit or absorb infrared radiation. The intensity of thermal radiation from an object is directly proportional to its surface Infrared emissivity and the fourth power of its surface temperature. Controlling surface infrared emissivity is a simple and flexible method for effectively regulating thermal radiation in practical applications. Unlike traditional materials with fixed emissivity, smart materials can dynamically adjust emissivity in response to external stimuli, offering effective regulation of infrared radiation according to environmental changes. Currently, smart materials with adjustable emissivity can be categorized into thermal modulation, electrical modulation, optical modulation, strain modulation, and humidity modulation, based on different modulation methods. Thermal and electrical modulation involve altering the material’s structure through external heat sources or electric fields to control thermal radiation. Optical modulation employs light to alter material emissivity, achieving non-contact regulation through varying light wavelengths or intensities to modify the material’s electronic structure or thermal state. Strain modulation utilizes mechanical strain to change the material’s lattice structure or morphology, thereby affecting its infrared radiation characteristics. Humidity modulation utilizes changes in ambient humidity to modulate material hygroscopicity or crystal structure, thereby affecting emissivity. The successful application of these materials relies on a comprehensive evaluation of their modulation properties, stability, cost, and adaptability.

This topical collection aims to provide a platform for sharing and disseminating knowledge, innovations, and experiences related to the development of infrared radiation modulation. Contributions are welcome, encompassing advancements in various research topics, such as dynamic thermal camouflage, temperature-adaptive radiative cooling, and intelligent thermal control for spacecraft.

Keywords: Smart materials; infrared radiation; emissivity; dynamic modulation; infrared camouflage; radiative cooling