Concentrated radiative cooling and its constraint from reciprocity

Minghao Dong, Linxiao Zhu, Bo Jiang, Shanhui Fan, Zhen Chen

Research output: Contribution to journalArticlepeer-review

14 Scopus citations


Concentrated radiative cooling, an analogous concept of the concentrated solar power technology, has the potential of amplifying both the cooling power and the temperature reduction. However, concentrators have not yet been systematically optimized. Moreover, a widely used theoretical approach to analyze such systems has neglected a fundamental constraint from reciprocity, which can lead to an overestimate of cooling performance and unclarified limits of amplification factors. Here we develop a theoretical framework addressing these shortcomings. Modeling suggests the optimized shape and geometric dimensions of concentrators, as well as the limiting cooling power and temperature reduction. Using an electroplated Al2O3 emitter and an optimized conical concentrator, we experimentally amplify the nighttime radiative cooling by 26%.

Original languageEnglish (US)
Pages (from-to)275-285
Number of pages11
JournalOptics Express
Issue number1
StatePublished - Jan 3 2022

All Science Journal Classification (ASJC) codes

  • Atomic and Molecular Physics, and Optics


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