Manipulating terahertz wave by a magnetically tunable liquid crystal phase grating.

ABSTRACT

This investigation demonstrates the feasibility of a magnetically tunable liquid crystal phase grating for the terahertz wave. The phase grating can be used as a beam splitter. The ratio of the zeroth and first-order diffracted THz-beams (0.3 THz) polarized in a direction perpendicular to that of the grooves of the grating can be tuned from 41 to 12. When the THz wave is polarized in any other direction, this device can be operated as a polarizing beam splitter.