[16a-E502-1~10] CS.3 Code-sharing Session of 3.10 & 3.11 & M

[16a-E502-2] Multilayers having higher solar reflectance than silver film for daytime radiative cooling

〇Satoshi Ishii^1,2,3, David Hernandez¹, Nicholaus Tanjaya^1,2, Tadaaki Nagao^1,4 (1.NIMS, 2.Univ. of Tsukuba, 3.JST-PRESTO, 4.Hokkaido Univ.)

Keywords:radiative cooling, thermal radiation, solar reflectance

A silver thin film has high reflectance in the visible and near infrared, however, its UV reflectance is low. The low UV reflectance can be compensated with dielectric multilayers if the silver thin film and dielectric layers are separated enough to avoid optical coupling. Here we show that by combining silver thin film and dielectric multilayers, solar reflectance can be as high as 98.7%. In addition, these multilayers have high infrared emittance such that these multilayers can be cooled radiatively in day which we proved experimentally.