Ultra-thin and near-unity selective emitter for efficient cooling

Do Hyeon Kim, Gil Ju Lee, Se Yeon Heo, Soomin Son, Kyeong Muk Kang, Heon Lee, Young Min Song

Research output: Contribution to journalArticlepeer-review

4 Citations (Scopus)


For the efficient radiative cooling of objects, coolers should emit heat within atmospheric transparent window and block heat absorption from the surrounding environments. Thus, selective emitters enable highly efficient cooling via engineered photonic structures such as metamaterials and multi-stacking structures. However, these structures require sophisticated fabrication processes and large quantities of materials, which can restrict mass-production. This study introduces an ultra-thin (∼1 µm) and near-unity selective emitter (UNSE) within the atmospheric window, which can be fabricated using simple and affordable process. The combination of infrared (IR) lossy layers and high index lossless layer enhances the resonance in the structure thus, the emissivity in long wavelength IR region increases to near-unity within a thickness of ∼1 µm.

Original languageEnglish
Pages (from-to)31364-31375
Number of pages12
JournalOptics Express
Issue number20
Publication statusPublished - 2021 Sept 27

ASJC Scopus subject areas

  • Atomic and Molecular Physics, and Optics


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