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Fabrication And Characterization Of Photonic Crystal Slow Light Waveguides And Cavities
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Structurally Colored Photonic Crystal Biomimetic Microstructures for Daytime Radiative Cooling.

Lili Yang1,2, Gang Wang1, Shuxian Duan1

  • 1School of Energy and Power Engineering, Nanjing University of Aeronautics and Astronautics, Nanjing 210016, China.

ACS Applied Materials & Interfaces
|November 1, 2024
PubMed
Summary

This study introduces a biomimetic photonic crystal cooler that achieves passive radiative cooling with vibrant colors. It offers efficient thermal management, balancing aesthetics with high performance.

Keywords:
biomimetic microstructuresphotolithographyphotonic crystalradiative coolingspace thermal managementstructural coloring

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Area of Science:

  • Materials Science
  • Optics
  • Nanotechnology

Background:

  • Daytime radiative cooling is crucial for energy-efficient thermal management, especially in space.
  • Traditional radiative coolers often lack aesthetic appeal due to limitations with colored materials.
  • Achieving high solar reflectance and infrared emittance simultaneously is key for effective passive cooling.

Purpose of the Study:

  • To develop a structurally colored radiative cooler using biomimetic photonic crystals.
  • To achieve high solar spectral reflectance and mid-infrared emissivity for efficient passive cooling.
  • To explore the potential of microstructured surfaces for aesthetic and functional radiative cooling.

Main Methods:

  • Fabrication of a dual-layered microtruncated-cone array using an optimized lithographic process.
  • Utilizing a silver reflector and a 3D micrograting surface for structural coloration via interference.
  • Characterization of optical properties, including solar reflectance and mid-infrared emissivity.

Main Results:

  • The radiative cooler achieved a solar spectral reflectance of 0.95 and mid-infrared emissivity of 0.95.
  • Demonstrated a net theoretical cooling power of 106.9 W m⁻² and a subambient temperature drop of 7.4 °C at 40 °C.
  • Measured an average temperature reduction of 6.1 °C under direct sunlight, balancing color and cooling performance.

Conclusions:

  • The biomimetic microstructured radiative cooler effectively combines aesthetic coloration with high passive cooling performance.
  • Structural coloration through photonic crystals offers a viable alternative to dyes for colored radiative cooling applications.
  • This technology presents a promising solution for green thermal management in various applications, including space and architecture.