Simulations of micro-sphere/shell 2D silica photonic crystals for radiative cooling
Whitworth, Guy L. (Institut Català de Nanociència i Nanotecnologia)
Jaramillo Fernández, Juliana (Institut Català de Nanociència i Nanotecnologia)
Pariente, Jose Angel (Instituto de Ciencia de Materiales de Madrid)
Garcia, Pedro David (Institut Català de Nanociència i Nanotecnologia)
Blanco, Alvaro (Instituto de Ciencia de Materiales de Madrid)
Lopez, Cefe (Instituto de Ciencia de Materiales de Madrid)
Sotomayor Torres, Clivia M. (Institut Català de Nanociència i Nanotecnologia)

Data:	2021
Resum:	Passive daytime radiative cooling has recently become an attractive approach to address the global energy demand associated with modern refrigeration technologies. One technique to increase the radiative cooling performance is to engineer the surface of a polar dielectric material to enhance its emittance atwavelengths in the atmospheric infrared transparency window (8-13 ìm) by outcoupling surface-phonon polaritons (SPhPs) into free-space. Here we present a theoretical investigation of new surface morphologies based upon self-assembled silica photonic crystals (PCs) using an in-house built rigorous coupled-wave analysis (RCWA) code. Simulations predict that silica micro-sphere PCs can reach up to 73 K below ambient temperature, when solar absorption and conductive/convective losses can be neglected. Micro-shell structures are studied to explore the direct outcoupling of the SPhP, resulting in near-unity emittance between 8 and 10 ìm. Additionally, the effect of material composition is explored by simulating soda-lime glass micro-shells, which, in turn, exhibit a temperature reduction of 61 K below ambient temperature. The RCWA code was compared to FTIR measurements of silica micro-spheres, self-assembled on microscope slides.
Ajuts:	European Commission 721062 European Commission 665919 Ministerio de Economía y Competitividad RyC-2015-18124 Ministerio de Ciencia e Innovación SEV-2017-0706 Agencia Estatal de Investigación PGC2018-101743-B-I00 Agencia Estatal de Investigación RTI2018-093921-B-C41 Agencia Estatal de Investigación RTI2018-093921-A-C44
Nota:	Altres ajuts: the CERCA Program/Generalitat de Catalunya.
Nota:	L'article s'ha publicat sota la OSA Open Access Publishing Agreement https://www.osapublishing.org/submit/review/pdf/OSACopyTransferOAAgrmnt(2017-09-05).pdf
Drets:	Tots els drets reservats.
Llengua:	Anglès
Document:	Article ; recerca ; Versió publicada
Matèria:	Infrared transparency ; Material compositions ; Refrigeration technology ; Rigorous coupled wave analysis ; Self-assembled silica ; Surface phonon-polaritons ; Temperature reduction ; Theoretical investigations
Publicat a:	Optics express, Vol. 29, issue 11 (May 2021) , p. 16857-16866, ISSN 1094-4087

DOI: 10.1364/OE.420989
PMID: 34154238

10 p, 5.9 MB

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