Terahertz
devices using liquid crystal materials
We
fabricated a universal polarization terehertz phase
controller using a liquid crystal cell with graphene
electrodes. The detailes are described in the
following paper. In this study, we demonstarted that
functionalized active terahertz devices were realized
by employing liquid crsytal materials.
*T. Sasaki et al., Opt. Lett. 40, 1544 (2015). |
![]() |
Three-dimensional vector holography We proposed three-dimensional vector holograms, which were recorded in initially anisotropic media. We demonstrated that spatial molacular alignment of liquid crystals could be controlled in real time by means of three-dimensional vector holography. *T. Sasaki et al., Holograms- Recording Materials and Applications, pp. 179-196 (INTECH, 2011). |
![]() |
Polarimeters
using polymer liquid crystal films We designed a anisotropic diffraction grating to realize a diffractive polarimeter. The grating was fabricated by vector holographic recording in a photoreactive polymer liquid crystal film. This polarimeter realize robust and high speed polarization analysis. *Patent No. P5109112 (2012). |
![]() |
Diffraction gratings using
liquid crystal cells We fabricated various liquid crystal diffraction gratings using photocrosslinkable liquid crystalline polymer films for alignment layers of low-molecular-weight liquid crystals. These gratings realize polarization control in the diffraction process. The fabrication methods diffraction properties were summerized in the following book. *T. Sasaki et al., Liquid Crystal Polymers, pp. 221-240 (Springer, 2015). |
![]() |
Spatial optical
solitons in liquid crystals Liquid crystals are nonlinear optical media. We study nonlinear propagation properties of gaussian visible light beams in liquid crystal cells to obtain spatial optical solitons. We showed that highly efficient solitons could be formed in dye-doped liquid crystals. *KAKENHI 24760265 |
![]() |
Surface relief formation in azopolymer
films Surface relief gratings are formed in azopolymer films by vector holographic recordings. However the formation mechanism has not been completely explained yet. We observed the relief formation in real time and analyzed on the basis of the optical gradient force. *T. Sasaki et al., Appl. Phys. B 114, 373 (2014). |
![]() |