Oxide/Metal/Oxide/Metal/Oxide 구조의 파장 제어 투명 필름을 이용한 적외선 차폐 활용

Abstract

Light control can provide practical improvements in regard to energy utilization. Light scattering is the interaction of light with a medium that spontaneously enables the uniform diffusion of sunlight and improves heat and light management efficiency. In this study, we have developed functionally transparent films capable of controlling light. These films were composed of alternating layers of metal (M) and oxide (O) in the form of oxide/metal/oxide (OMO) and oxide/metal/oxide/metal/oxide (OMOMO) structures that exhibited high visible transmittance and infrared reflectance. The films of the OMO and OMOMO structures efficiently tuned the light to filter long-wavelength heat radiation and pass through the visible light range, providing superior heat shielding performance. The OMO film provided higher optical transmittance (>72%) than the OMOMO film at a wavelength of 550 nm with effective infrared (IR) blocking. Meanwhile, the OMOMO film enhanced the IR reflection effect by 30% compared to that with the OMO film. The addition of a metal-oxide layer to the OMO structure generates multiple instances of light refraction and reflection according to Bragg’s law and multiple thin-film structures, thus leading to increased reflectance in the near-infrared range. These light-scattering films can be applied in smart windows and agricultural greenhouses, contributing to energy savings. Beyond the energy aspect, it suggests potential applications in regard to military technology by providing capabilities for evading infrared detection and camouflage effects.