Be applied to quite a few devices employing visible (VIS) and near-infrared (NIRBe applied to

Be applied to quite a few devices employing visible (VIS) and near-infrared (NIR
Be applied to lots of devices using visible (VIS) and near-infrared (NIR) wavelengths. two. Optical Properties of CLC Layers with Helical Nanostructures CLCs are a mixture of nematic liquid crystals (NLCs) and chiral molecules. They kind self-organized periodic helical nanostructures inside a cell with an alignment layer. An essential intrinsic optical characteristic of your CLC structure is its circular polarization of incident light. Figure 1 shows a fundamental optical home of your CLC cell. For an unpolarized incident light, a CLC cell with a right-handed helix reflects right-circularly polarized light and transmits left-circularly polarized light within a photonic bandgap wavelength range. Thus, for any light with all the very same handedness because the CLC, Icosabutate manufacturer selective (Bragg) reflection happens within a wavelength range no p ne p using a photonic bandgap (PBG) (|ne – no |p), where p (pitch) will be the length for one full rotation with the director about the helix axis (it might be controlled by the ratio of chiral molecules to the nematicaround the helix axis (it could possibly be controlled by the ratio of chiral molecules for the liquid crystal) and and are ordinary and extraordinary refractive indices of molecules, respectively [150]. We are able to obtain left- and right-circularly3 polarized Polymers 2021, 13, 3720 of 16 the selective band of a CLC cell. As a result, CLCs work as a circular polarizer in tonic bandgap wavelength range. Figure 1 also shows the IQP-0528 manufacturer Principle of a notch f liquid crystal) right-handed helix (R-PCLC) as well as a polymerized CLC w polymerized CLC having a and no and ne are ordinary and extraordinary refractive indices of nematic molecules, respectively [150]. We can obtain left- and right-circularly polarized light handed helix (L-PCLC). For unpolarized incident light,as a circular polarizer inpolarized inside the selective band of a CLC cell. Hence, CLCs operate right-circularly the photonic bandgap wavelength range. Figure 1 also shows the principle of a notch filter by the band is reflected in the CLCa having a right-handedand a polymerized CLC using a helix, and left-circularly p a polymerized CLC with right-handed helix (R-PCLC) light within the band is reflected in the For unpolarizedleft-handed helix, in polarized light left-handed helix (L-PCLC). CLC with incident light, right-circularly turn. Furthermo within the band is reflected in the CLC using a right-handed helix, and left-circularly polarized bining some L-PCLC cells is reflected at the CLC with left-handed helix, in turn. Additionally, comand R-PCLC cells might be transformed into other op light inside the band vices including a bining some L-PCLC cellsa beam splitter, be transformed into other optical devices the m bandpass filter, and R-PCLC cells could along with a mirror. We can see which include a bandpass filter, a beam splitter, along with a mirror. We can see the multifunctional tional properties of PCLC cells oneby one particular in thein the following sections. by one following sections. properties of PCLC cells oneFigure 1. Principle of a circular polarizer by 1 R-PCLC (or L-PCLC) and a notch filter by two R- PCLCs. A notch filter Figure 1. Principle light, circular polarizer by a photonic band is (or L-PCLC) and a notch filter performs for unpolarized incident of a right-circularly polarized light inone R-PCLC reflected in the R-PCLC cell, and then left-circularly polarized light within the very same photonic band is reflected in the L-PCLC cell,right-circularly polarized light PCLCs. A notch filter operates for unpolarized incident light, in tu.