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    • 4. 发明授权
    • Method of fabricating anisometric metal needles and birefringent
suspension thereof in dielectric fluid
    • 制造各向异性金属针及其在介质流体中的双折射悬浮液的方法
    • US5308552A
    • 1994-05-03
    • US911825
    • 1992-07-10
    • Chan S. BakLeroy J. MillerCamille I. Van Ast
    • Chan S. BakLeroy J. MillerCamille I. Van Ast
    • G02F1/19C23C14/00C23C14/04C23C14/22G02F1/17C10M3/10
    • C23C14/225C23C14/0005C23C14/04G02F1/172Y10T428/12014Y10T428/12021Y10T428/12424Y10T428/12431Y10T428/12438Y10T428/12458Y10T428/12465Y10T428/12493
    • A grating (22) of narrow parallel ridges (24) is formed in the surface (26) of a substrate (20) made of a hard material such as silicon dioxide. Metal (40) is deposited onto the grating (22) perpendicular to the ridges (24) at an angle of approximately 45.degree. to the surface (26) of the grating such that the metal (40) is deposited onto the top (24a) and one of the sides (24b) of the each of the ridges (24) to form generally L-shaped metal strips (12') thereon. The metal strips (12') are cut at periodic intervals along the ridges (24) to produce anisometric metal needles (12). The substrate (20) is immersed in a dielectric fluid (14), and ultrasonic energy is applied to cause the needles (12) to release from the substrate (20) into suspension in the fluid (14). The L-shape of the needles (12) makes them resistant to bending. The suspension ( 10) has birefringent properties similar to liquid crystals, but may be electrically switched at much higher speed. The index of refraction of the suspension (10) varies in accordance with the alignment of the needles (12), thereby enabling the direction and phase of an electromagnetic wave propagating through the suspension (1) to be controlled by varying the magnitude of the applied electric field.
    • 在由诸如二氧化硅的硬质材料制成的衬底(20)的表面(26)中形成有窄平行脊(24)的光栅(22)。 金属(40)以与栅格的表面(26)成大约45°的角度垂直于脊(24)沉积到光栅(22)上,使得金属(40)沉积到顶部(24a)上, 和每个脊(24)的一个侧面(24b)中的一个,以在其上形成大致L形的金属条(12')。 沿着脊(24)以周期性间隔切割金属条(12')以产生不等距金属针(12)。 将衬底(20)浸入介电流体(14)中,并施加超声能量以使针(12)从衬底(20)释放到流体(14)中的悬浮液中。 针(12)的L形使得它们抗弯曲。 悬浮液(10)具有与液晶类似的双折射性质,但可以以更高的速度进行电气切换。 悬架(10)的折射率根据针(12)的对准而变化,从而使通过悬架(1)传播的电磁波的方向和相位可以通过改变所施加的 电场。
    • 5. 发明授权
    • Anisometric metal needles with L-shaped cross-section
    • 具有L形横截面的异相金属针
    • US5376463A
    • 1994-12-27
    • US124777
    • 1993-09-20
    • Chan S. BakLeroy J. MillerCamille I. Van Ast
    • Chan S. BakLeroy J. MillerCamille I. Van Ast
    • G02F1/19C23C14/00C23C14/04C23C14/22G02F1/17B22F9/00
    • C23C14/225C23C14/0005C23C14/04G02F1/172Y10T428/12014Y10T428/12021Y10T428/12424Y10T428/12431Y10T428/12438Y10T428/12458Y10T428/12465Y10T428/12493
    • A grating (22) of narrow parallel ridges (24) is formed in the surface (26) of a substrate (20) made of a hard material such as silicon dioxide. Metal (40) is deposited onto the grating (22) perpendicular to the ridges (24) at an angle of approximately 45.degree. to the surface (26) of the grating such that the metal (40) is deposited onto the top (24a) and one of the sides (24b) of the each of the ridges (24) to form generally L-shaped metal strips (12') thereon. The metal strips (12') are cut at periodic intervals along the ridges (24) to produce anisometric metal needles (12). The substrate (20) is immersed in a dielectric fluid (14), and ultrasonic energy is applied to cause the needles (12) to release from the substrate (20) into suspension in the fluid (14). The L-shape of the needles (12) makes them resistant to bending. The suspension (10) has birefringent properties similar to liquid crystals, but may be electrically switched at much higher speed. The index of refraction of the suspension (10) varies in accordance with the alignment of the needles (12), thereby enabling the direction and phase of an electromagnetic wave propagating through the suspension (10) to be controlled by varying the magnitude of the applied electric field.
    • 在由诸如二氧化硅的硬质材料制成的衬底(20)的表面(26)中形成有窄平行脊(24)的光栅(22)。 金属(40)以与栅格的表面(26)成大约45°的角度垂直于脊(24)沉积到光栅(22)上,使得金属(40)沉积到顶部(24a)上, 和每个脊(24)的一个侧面(24b)中的一个,以在其上形成大致L形的金属条(12')。 沿着脊(24)以周期性间隔切割金属条(12')以产生不等距金属针(12)。 将衬底(20)浸入介电流体(14)中,并施加超声能量以使针(12)从衬底(20)释放到流体(14)中的悬浮液中。 针(12)的L形使得它们抗弯曲。 悬浮液(10)具有与液晶类似的双折射性质,但可以以更高的速度进行电气切换。 悬架(10)的折射率根据针(12)的对准而变化,由此能够通过改变所施加的针(12)的大小来控制通过悬架(10)传播的电磁波的方向和相位 电场。