Ultrahigh performance passive radiative cooling by hybrid polar dielectric metasurface thermal emitters

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外文摘要：Real-world passive radiative cooling requires highly emissive,selective,and omnidirectional thermal emitters to maintain the radiative cooler at a certain temperature below the ambient temperature while maximizing the net cooling power.Despite various selective thermal emitters have been demonstrated,it is still challenging to achieve these conditions sim-ultaneously because of the extreme difficulty in controlling thermal emission of photonic structures in multidimension.Here we demonstrated hybrid polar dielectric metasurface thermal emitters with machine learning inverse design,en-abling a high emissivity of～0.92 within the atmospheric transparency window 8-13 μm,a large spectral selectivity of～1.8 and a wide emission angle up to 80 degrees,simultaneously.This selective and omnidirectional thermal emitter has led to a new record of temperature reduction as large as～15.4 °C under strong solar irradiation of～800 W/m2,signific-antly surpassing the state-of-the-art results.The designed structures also show great potential in tackling the urban heat island effect,with modelling results suggesting a large energy saving and deployment area reduction.This research will make significant impact on passive radiative cooling,thermal energy photonics and tackling global climate change.

外文关键词：

radiative coolingdielectric metasurfacesmachine learningthermal emitters

作者：

Yinan Zhang、Yinggang Chen、Tong Wang、Qian Zhu、Min Gu

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作者单位：

Institute of Photonic Chips,University of Shanghai for Science and Technology,Shanghai 200093,China

Centre for Artificial-Intelligence Nanophotonics,School of Optical-Electrical and Computer Engineering,University of Shanghai for Science and Technology,Shanghai 200093,China

基金：

National Natural Science Foundation of China(NSFC)Shanghai Pujiang ProgramShanghai Science and Technology ProgramShanghai Yangfan ProgramProgram for Professor of Special Appointment(Eastern Scholar)at Shanghai Institutions of Higher Learning

项目编号：

6217515420PJ141190021ZR144550022YF1430200

出版年：

2024

DOI：

10.29026/oea.2024.230194

光电进展(英文版)

ISSN：

年,卷(期)：2024.7(4)