Abstract
A model approach for the Mueller matrix (MM) of the twisted nematic liquid crystal spatial light modulator (TNLC-SLM) was proposed. In the first part of the study, the MM of the TNLC cell in the absence of applied voltage was investigated both theoretically and experimentally. In the second part, the model approach was improved by considering the reorientation of both tilt and azimuth angles of the liquid crystal (LC) molecules in the presence of applied voltage. Comparison of the theoretical MM elements with the experimental ones from the literature showed that, instead of decaying exponentially, the azimuth angle rotates with respect to the cell walls in a critical voltage range before the molecules are completely untwisted. It also pointed out that the effect of the tilt and the azimuth angles of the molecules on the optical properties of the light travelling in the LC cell could change depending on the polarization state of the input light and the voltage applied to the cell.
Highlights
Twisted nematic liquid crystal (TNLC) cells are devices that are widely used in technology as the backbone of several electro-optic (EO) devices
Liquid crystal displays (LCD) are amplitude modulators mostly used as displays in laptops, TVs, cellphones, and tablets for years [4,5,6,7]
According to other scenarios, m 44 decreases more in that critical region indicating that the circularly polarized input light is expected to be more elliptical. This unexpected behavior of the LC molecules suggested in the third scenario shows a good agreement with the experimental curves. These results reveal an important character of the LC-based devices: the azimuth angle reorientation plays a more important role than that of the tilt angle on the optical properties of the light transmitted through the cell
Summary
Twisted nematic liquid crystal (TNLC) cells are devices that are widely used in technology as the backbone of several electro-optic (EO) devices. Comparison of our theoretical results with the experimental ones from the literature showed that, in some critical voltage range, before the LC molecules are completely untwisted, the behavior of the azimuth angle of the LC molecules is more significant than that of the tilt angle and could explain the polarization properties of the elliptically and circularly polarized light travelling in the cell.
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