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    • 1. 发明授权
    • Input light coupler using a pattern of dielectric contrast distributed in at least two dimensions
    • 使用至少二维分布的介电对比度图案的输入光耦合器
    • US06574383B1
    • 2003-06-03
    • US09845811
    • 2001-04-30
    • Alexei A. ErchakShanhui FanErich P. IppenJohn D. JoannopoulosLeslie A. KolodziejskiGale S. PetrichDaniel J. Ripin
    • Alexei A. ErchakShanhui FanErich P. IppenJohn D. JoannopoulosLeslie A. KolodziejskiGale S. PetrichDaniel J. Ripin
    • G02B626
    • B82Y20/00G02B6/1225
    • An input light-coupling device comprising a dielectric layer containing a pattern of dielectric contrast distributed in at least two dimensions. The pattern of dielectric contrast, which may or may not be periodic, is designed to facilitate coupling to the dielectric layer of electromagnetic radiation. The electromagnetic radiation may be propagating within a surrounding medium of lower dielectric constant than that of said dielectric layer, input at directions including normal incidence from which light cannot typically couple to the dielectric layer without the presence of the pattern of dielectric contrast. The input light may constitute an optical signal propagating in an optical fiber or in free space. Light that is in-coupled may be directed in as many directions as dictated by the symmetry of the pattern of dielectric contrast. The dielectric layer may contain output waveguides surrounding the input coupling structure. The light coupling structure may be fabricated in a dielectric layer separated from a high-dielectric substrate by a low-dielectric layer to avoid losses of the input signal to the substrate. A mirror comprising either a reflective material or alternating layers of high and low dielectric material may be disposed between the low-dielectric layer and the substrate to enhance the total input coupling to the dielectric layer containing the input coupling structure.
    • 一种输入光耦合装置,包括包含至少二维分布的介电对比度图案的电介质层。 电介质对比度图案可以是或可以不是周期性的,以便于耦合到电磁辐射的电介质层。 电磁辐射可以在比所述介电层的介电常数低的周围介质中传播,在包括法向入射的方向上输入,光不能典型地耦合到电介质层而不存在介电对比度图案。 输入光可以构成在光纤中或在自由空间中传播的光信号。 耦合的光可以沿着介电对比度图案的对称性所指示的方向指向。 电介质层可以包含围绕输入耦合结构的输出波导。 光耦合结构可以通过低电介质层在与高电介质衬底分离的电介质层中制造,以避免输入到衬底的信号的损失。 包括反射材料或高介电材料和低介电材料的交替层的反射镜可以设置在低介电层和衬底之间,以增强与包含输入耦合结构的介电层的总输入耦合。
    • 10. 发明授权
    • High omnidirectional reflector
    • 高全向反射器
    • US06903873B1
    • 2005-06-07
    • US09634099
    • 2000-08-08
    • John D. JoannopoulosShanhui FanJoshua N. WinnYoel Fink
    • John D. JoannopoulosShanhui FanJoshua N. WinnYoel Fink
    • G02B5/08G02B5/28G02B5/30G02B6/12G02B6/122G02B27/00
    • G02B27/0012B82Y20/00G02B5/0825G02B6/122G02B6/1225G02B2006/12104
    • A reflector, a method of producing same and a method of creating high omnidirectional reflection for a predetermined range of frequencies of incident electromagnetic energy for any angle of incidence and any polarization. The reflector includes a structure with a surface and a refractive index variation along the direction perpendicular to the surface while remaining nearly uniform along the surface. The structure is configured such that i) a range of frequencies exists defining a photonic band gap for electromagnetic energy incident along the perpendicular direction of said surface, ii) a range of frequencies exists defining a photonic band gap for electromagnetic energy incident along a direction approximately 90° from the perpendicular direction of said surface, and iii) a range of frequencies exists which is common to both of said photonic band gaps. In an exemplary embodiment, the reflector is configured as a photonic crystal.
    • 反射器,其制造方法以及用于针对任何入射角和任何极化的入射电磁能的预定频率范围产生高全向反射的方法。 反射器包括具有沿着垂直于表面的方向的表面和折射率变化的结构,同时沿表面保持几乎均匀的结构。 该结构被配置为使得i)存在一定范围的频率,其限定沿着所述表面的垂直方向入射的电磁能的光子带隙,ii)存在限定沿着近似方向入射的电磁能的光子带隙的频率范围 与所述表面的垂直方向成90°,以及iii)存在对所述光子带隙两者共同的频率范围。 在示例性实施例中,反射器被配置为光子晶体。