Temperature-dependent optical properties of some mixtures nematic liquid crystal

Abstract

The presence of optical anisotropy in liquid crystals (LCs) has caused these materials to have dual refractive indices: ordinary (no) and extra-ordinary (ne). Many fundamental information about LCs can be found by looking at these refractive indices. In this work, the refractive indices of four mixtures nematic liquid crystal (NLC) have been studied as a function of temperature, and the relevant functions were then calculated. Subsequently, the order parameter of mentioned LCs was determined using three methods: Vuks, Haller, and the effective geometry parameter method. It was concluded that the obtained values are not significantly different and exhibit the same temperature dependence. The obtained results were evaluated in relation to the approach utilized.

Impact of laser polarization and angle of incidence on phase shifting efficacy of an all-optically addressed liquid crystal delay line at X band

“…The demonstration in this work furthers the potential of the all-optical approach in holding the promise for various gamechanging applications (both terrestrial and space environments to be discussed in a future paper). The insertion loss dependency on polarizations and incident angles will be investigated and reported in our later papers, based on which we can conclude the overall performance comparison with other stimuli, e.g., applying a magnetic field [8], temperature field [9], as well as the mainstream electrical field biasing [10] [11]. Upscaling techniques from microwave to millimeterwave [12] and terahertz [13] will also be undertaken in future endeavors as inspired by the upcoming 6G [14] and intelligent reflective surfaces [15] that advance at a rapid pace.…”

Temperature-dependent characterization of optical parameters in novel high birefringence nematic liquid crystal mixtures: an empirical investigation

“…Consequently, obtaining a thorough understanding of the NLC order parameter (S) becomes essential. This parameter holds a significant role, not only in the determination of refractive indices within NLCs [14,15] but also in revealing their behavior in relation to temperature variations. Such comprehensive comprehension is essential for the accurate characterization of NLC materials [16].…”

Impact of temperature on optical sensing in biology based on investigation of SARS‐CoV‐2

“…There is a very broad range of fiber‐optic temperature sensors, however their construction addresses the need of industry, and they are not appropriate for application in the biomedicine. There are temperature sensors constructed with materials which parameters changes [ 9 ] (e.g., refractive index) due to the temperature changes [ 10 , 11 , 12 ]. Despite many changes of such sensors, their probes are based on the materials which make them toxic for biological tissue, their dimensions are too big to measure small samples [ 13 , 14 , 15 ] or the needed power for the proper operation can destroy the biological samples [ 16 , 17 , 18 ].…”