Abstract
In this paper, we demonstrate a holographic polymer-stabilized blue-phase liquid crystal grating fabricated using a visible laser. As blue phase is stabilized by the interfered light, polymer-concentration gradient is achieved simultaneously. With the application of a uniform vertical electric field, periodic index distribution is obtained due to polymer-concentration gradient. The grating exhibits several attractive features such as polarization-independency, a broad temperature range, sub-millisecond response, simple fabrication, and low cost, thus holding great potential for photonics applications.
Highlights
Liquid crystal (LC) based electrically tunable diffraction gratings are widely used in threedimensional (3-D) displays, optical communications, beam steering and remote sensing, for their light weight, low cost, and low power consumption [1,2,3,4,5,6,7]
We propose a novel one-step holographic fabrication of a tunable phase grating based on polymer-stabilized blue-phase liquid crystal (PSBPLC)
The diffraction efficiency of the H-PSBPLC grating is mainly determined by the maximum refractive index contrast δnmax between bright and dark regions
Summary
Liquid crystal (LC) based electrically tunable diffraction gratings are widely used in threedimensional (3-D) displays, optical communications, beam steering and remote sensing, for their light weight, low cost, and low power consumption [1,2,3,4,5,6,7]. Some electrode-pattern-free PSBPLC based polarization-independent gratings using photo masks have been proposed, but the grating periods are large and the fabrication processes are complicated [19, 20]. The holographic polymer-stabilized blue-phase liquid crystal (H-PSBPLC) grating exhibits several attractive features such as polarization-independency, a broad temperature range and sub-millisecond response. Without patterned electrodes or photo masks, the simple holographic fabrication could achieve high spatial resolution at low cost
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