Phase plate and an optical data recording/reproducing device
A phase plate, incident light technology, used in optical recording/reproducing, optical recording heads, beam guiding devices, etc., and can solve problems such as large optical systems
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no. 2 Embodiment approach
[0151] Next, a second embodiment of the polarization beam splitter used in the optical information recording and reproducing apparatus of the present invention will be described.
[0152] 12 shows a cross-sectional view of a polarizing beam splitter PB2 according to a second embodiment of the present invention. In this polarizing beam splitter PB2, an ordinary ray of refractive index n is formed on one side of a transparent substrate 11. o , the extraordinary refractive index n e (n e >n o ), the polymer liquid crystal layer 11A is processed into a blazed diffraction grating with a sawtooth grating shape and a grating constant (pitch) of L. Although this is the same as the polarizing beam splitter PB1, in order to form a uniform refractive index transparent material 14, The refractive index n of the homogeneous refractive index transparent material filled in the concave portion of the polymer liquid crystal layer 11A s is the ordinary refractive index n o and the extraordi...
Embodiment approach
[0158] Next, a third embodiment of the polarization beam splitter used in the optical information recording and reproducing apparatus of the present invention will be described.
[0159] FIG. 13 shows a cross-sectional view of a polarization beam splitter PB3 according to a third embodiment of the present invention. This polarization beam splitter PB3 is different from the polarization beam splitter PB1 in the following point. The polarization beam splitter PB1 shown in FIG. 11 is formed. Among them, polymer liquid crystal layers 11A and 12A processed into zigzag-shaped blazed diffraction gratings are polymer liquid crystal layers 11B and 12B in which the inclination direction of the grating slope is reversed relative to the Y axis.
[0160] According to the structure thus formed, as shown in FIG. 13 , the diffraction directions of P-polarized light and S-polarized light are interchanged with those shown in FIG. 11 . By performing alignment treatment on the alignment film of t...
Embodiment 1
[0192] The phase plate P1 shown in the first embodiment of the phase plate will be specifically described with reference to FIG. 1 (sectional view) and FIG. 2 (plan view).
[0193] (1) Form a polyimide film for an alignment film on one side of a glass substrate (corresponding to the transparent substrate 1), and perform an alignment treatment so that liquid crystal monomers having an anisotropic refractive index are aligned with respect to the X-axis in FIG. Each polymer liquid crystal film 2 is formed by aligning in the direction of +22.5°, and then polymerizing and curing by irradiating ultraviolet light. Here, the clockwise rotation angle from the +X axis to the +Y axis direction in FIG. 2 is positive. At this time, the polymer liquid crystal film 2 is formed with a film thickness of 2.22 μm and an ordinary refractive index n o =1.55, extraordinary light refractive index n e =1.67, a polymer liquid crystal film in which the molecular orientation is aligned in the film thi...
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Abstract
Description
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