For example, a CLC grating can be fabricated via a spatial arrangement of the vertical and planar arrangement of the CLC molecules by two-beam interference .
In this work, optical gratings are fabricated on the basis of two-beam interference and fabrication technique of CLC template (washing-out/refilling) [16-18].
The see-through display device is also characterized in that the hologram includes a first interference fringe recorded by two-beam interference
using object light and reference light inputted to the first surface, the image light inputted to the first surface is deflected toward the interface by the first interference fringe, and the interface reflects the image light toward the first surface.
This is possible by irradiating the sample using a two-beam interference
setup, then rotating the patterned substrate at certain angle and irradiating the substrate again.
In the case of two-beam interference
experiments, the period (P) of the periodic line-like pattern can be controlled by changing the angle between the laser beams (alpha) and the wavelength of the laser light as indicated in Eq.