专利名称：Method of fabricating anisometric metal
needles and birefringent suspension thereofin dielectric fluid
发明人：Chan S. Bak,Leroy J. Miller,Camille I. Van Ast申请号：US07/674987申请日：19910326公开号：US05179993A公开日：19930119
摘要：A grating (22) of narrow parallel ridges (24) is formed in the surface (26) of asubstrate (20) made of a hard material such as silicon dioxide. Metal (40) is depositedonto the grating (22) perpendicular to the ridges (24) at an angle of approximately 45° tothe 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- shapedmetal strips (12') thereon. The metal strips (12') are cut at periodic intervals along theridges (24) to produce anisometric metal needles (12). The substrate (20) is immersed in adielectric fluid (14), and ultrasonic energy is applied to cause the needles (12) to releasefrom 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 similarto liquid crystals, but may be electrically switched at much higher speed. The index ofrefraction of the suspension (10) varies in accordance with the alignment of the needles(12), thereby enabling the direction and phase of an electromagnetic wave propagatingthrough the suspension (10) to be controlled by varying the magnitude of the appliedelectric field.
申请人：HUGHES AIRCRAFT COMPANY
代理人：E. E. Leitereg,W. K. Denson-Low
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