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Article Dans Une Revue Optics Express Année : 2022

Photonic crystal backbone for light trapping inside an ultrathin, low absorbing layer

Résumé

A few tens of nanometre thick ultrathin materials may suffer from a very low absorption at their band edges. In this work, we investigate a photonic crystal (PC) made of a lowcost, transparent patterned silicon nitride (SiN x ) layer, conformally covered with an ultrathin active layer (e.g., 20 nm TiO 2 ) in view of its use in various applications such as photocatalysis. A fair estimation of the absorption enhancement, considering the volume of the active material, is calculated using RCWA. A remarkable enhancement (more than ten-folds) in absorptance in the near UV range and a very high transmittance over the visible range are observed. A detailed modal analysis of the structures-of-interest unravels the Light Trapping (LT) mechanisms and allows the derivation of key design guidelines. Optical measurements on a patterned sample provide a first proof-of-concept of such possible photonic backbone structures suitable for highly efficient depollution and artificial photosynthesis for solar fuels production.
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Dates et versions

hal-03766724 , version 1 (22-11-2022)

Identifiants

Citer

Said El-Jallal, Marion Hochedel, Jerôme Capitolis, Hai Son Nguyen, Céline Chevalier, et al.. Photonic crystal backbone for light trapping inside an ultrathin, low absorbing layer. Optics Express, 2022, 30 (16), pp.29694. ⟨10.1364/OE.461390⟩. ⟨hal-03766724⟩
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