Scattering birefringence polarizers based on oriented blends of poly(ethylene terephthalate) and core–shell particles

Abstract

Articles you may be interested inBirefringence measurement in polarization-sensitive optical coherence tomography using differential-envelope detection method Rev. Sci. Instrum. 81, 053705 (2010); 10.1063/1.3418834 Optical and mechanical anisotropies of oriented poly(ethylene terephthalate) films Appl. Phys. Lett. 89, 051906 (2006); 10.1063/1.2234297 High performance Feussner-type polarizers based on stretched poly(ethylene-terephthalate) filmsHere, we present the results on the optical characteristics of polymeric, linear polarizers produced from oriented, two-component, polymer blends. By a proper selection of materials and drawing conditions, the refractive index of the dispersed phase of the blend is matched with the ordinary refractive index of the birefringent continuous phase while, at the same time, a large refractive index mismatch is generated in the perpendicular direction. The films are, therefore, transparent or opaque, dependent on the polarization direction of the incident light and act as linear polarizers with a high contrast ratio ͑Ϸ1000͒ between the transparent and opaque state. These polarizers are all-polymer-based linear polarizers that operate on the anisotropic scattering of light, instead of anisotropic absorption, which offers some unique features and advantages.

Optomechanical properties of stretched polymer dispersed liquid crystal films for scattering polarizer applications

“…1͑b͒. In order to create a light scattering polarizer, a composite material must be used, such as uniaxially stretched phase separated polymer films, 6,7 isotropic particle dispersed uniaxially stretched polymer films, 8 and uniaxially stretched polymer dispersed liquid crystal ͑PDLC͒ films. 9 From a technology perspective, scattering polarizers are less expensive than reflective polarizers due to their simple structure and fabrication process.…”

Novel Polarized-Light Emitting Polymer Systems: II. Use of Form Birefringent Polarization-Selective Mirrors

“…The preset limitations of liquid-crystal displays (LCDs) have stimulated research on novel polarizing systems based on selective reflection or scattering of light 1,2) as alternatives to the inefficient dichroic polarizers generally employed in LCDs, which absorb at least 50% of the incoming light. 3) In part I of this study, the above list of non-absorbing polarizers was expanded with an illumination system that combines two main components of these devices in one single element: the backlight system and one polarizer.…”

Fiber‐Oriented Liquid Crystal Polarizers Based on Anisotropic Electrospinning

“…In principle, scattering polarizers are produced from blends of an isotropic polymer and a birefringent material with distinct ordinary and extraordinary refractive index (RI) values. [10][11][12][13][14] The RI of the isotropic material matches one of the RIs of the birefringent material, and mismatches another. When the polymer blends are uniaxially elongated, they scatter or transmit the light, depending on the polarizing direction of the incident light.…”

“…When the polymer blends are uniaxially elongated, they scatter or transmit the light, depending on the polarizing direction of the incident light. In the past decades, although a number of scattering polarizers have been developed, [10][11][12][13][14][15] the fabrication is mainly based on stretch methods, among which stretched PDLC (polymer-dispersed liquid crystal) film is representative. [14,15] When PDLC film is stretched, liquid crystal droplets dispersed in flexible polymers are elongated and the birefringent molecules align parallel to the surface of the droplets.…”