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Article Dans Une Revue Physical Review Materials Année : 2022

Optically tunable metal-dielectric diffractive structures

Résumé

Hybrid metal-polymer micro-pillar arrays are elaborated by solvant-assisted embossing techniques and subsequent gold deposition. The polymer is PMMA grafted with DR1 azobenzene derivatives. This photochromic material exhibits spectacular photomechanical properties. Under off-normal ppolarized illumination in the absorption band of the DR1, the metal-polymer hybrid micro-pillars bend in a direction determined by the light polarization. The deformation remains stable when the light excitation is turned off. The optically driven modification of the pillar shape allows to tune the optical properties of the pillar arrays. Very large intensity changes are measured in the diffraction spectra at zero order (specular reflection), first order and second order, with almost on and off switching of the diffraction efficiency. The photo-induced bending of the micro-pillars can be fully reversed by switching the linear light polarization to the orthogonal s-polarization state. This allows to recover the initial optical properties of the pillar array. The polarization-controlled reversibility of the pillars deformation suggests a complex photo-induced deformation mechanism involving stress and stress release assisted by the change in the visco-elastic properties of the polymer under illumination in the absorption band of the DR1 chromophore.
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Dates et versions

hal-04371408 , version 1 (03-01-2024)

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Sylvain Chevalier, Filippo Fabbri, Khalid Lahlil, Yves Lassailly, Lucio Martinelli, et al.. Optically tunable metal-dielectric diffractive structures. Physical Review Materials, 2022, 6 (9), pp.095202. ⟨10.1103/PhysRevMaterials.6.095202⟩. ⟨hal-04371408⟩
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