Active control of light extraction in the near-IR range with sub-wavelength periodic structures

Anatole Héliot (1) , Sylvain Pelloquin (1) , Olivier Gauthier-Lafaye (1) , Antoine Monmayrant (1) , Henri Camon (1) , Thierry Gacoin (2) , Khalid Lahlil (2) , Lucio Martinelli (2) , Claudine Biver (3) , S. Archambeau (3)

1 LAAS-PHOTO - Équipe Photonique
2 LPMC - Laboratoire de physique de la matière condensée
3 Essilor International

Due to their narrow reflection peak as well as their compact structure, Guided Mode Resonance Filters (GMRFs) are attractive for many applications. We demonstrate the possibility to modulate the properties of a GMRF by associating with liquid crystals (LCs). By impregnating the diffraction grating with LCs, it is possible to switch between an active and an inactive state depending on the polarization of the light or the applied voltage. In this paper we fabricated and characterized the first diffraction order of LC-impregnated gratings with different periods (0,8 to 5,0μm) and depths (130 to 840nm) to test the ability of liquid crystals to adjust the diffraction properties. Finally, 99.8% of diffraction turn off with a 90° rotation polarization at zero voltage and 90 to 99% by applying a voltage of 30 V according to the grating dimensions. The effect of the grating dimension on the diffraction modulation capacity will be discussed.

Mots clés: GMRF; Tunable Diffraction Grating; Diffraction; Diffraction gratings; Liquid crystals; Gratings; Electric fields; Switches; Refractive index

Domaines: Science des matériaux [cond-mat.mtrl-sci]; Optique / photonique

Anatole Héliot, Sylvain Pelloquin, Olivier Gauthier-Lafaye, Antoine Monmayrant, Henri Camon, et al.. Active control of light extraction in the near-IR range with sub-wavelength periodic structures. Symposium on Design, Test, Integration & Packaging of MEMS and MOEMS (DTIP 2018), May 2018, Rome, Italy. ⟨10.1109/DTIP.2018.8394244⟩. ⟨hal-01842005⟩