Due to their narrow reflection peak as well as their compact structure, guided mode resonance filters (GMRFs) are attractive for many applications. In this work, we will demonstrate the possibility to modulate the properties of a GMRF by associating it 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 (0.8–5.0 µm) and depths (120 and 840 nm) to test the ability of liquid crystals to adjust the diffraction properties. Finally, without voltage, more than 99.8% of initial diffraction could be turned off with a 90° rotation polarization whereas, by applying a voltage of 30 V; 90–99% of the initial diffraction is turned off according to the grating dimensions. The effect of the grating dimension (period, depth) on the diffraction modulation capacity will be discussed.

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.

The present invention relates to a group of novel electrochromic materials. More specifically, it relates to electrochromic materials based on either single or two-core viologen systems and the use of these viologen systems as a variable transmittance medium for the manufacture of an optical article, such as an ophthalmic lens.

Transparent electrochromic systems (100) each comprise a pair of supply electrodes (1, 2) and at least one pair of bias electrodes (3, 4). polarization of the electrodes prevents a mutual neutralization reaction electroactive substances of the systems causes unnecessary consumption of electric current. They also avoid that the neutralization reaction is not limited a lower value of light transmission systems. For this, the biasing electrodes produce an electric field (E) inside the system, which draws in different zones the electroactive substances that have already reacted on the power supply electrodes.