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1. 发明授权

US5955749A Light emitting device utilizing a periodic dielectric structure 失效
标题翻译：利用周期性电介质结构的发光器件
公开(公告)号：US5955749A
公开(公告)日：1999-09-21
申请号：US758955
申请日：1996-12-02
申请人： John D. Joannopoulos , Shanhui Fan , Pierre R. Villeneuve , E. Frederick Schubert
发明人： John D. Joannopoulos , Shanhui Fan , Pierre R. Villeneuve , E. Frederick Schubert
IPC分类号： G02B6/122 , H01L33/08 , H01L33/24 , H01L33/00
CPC分类号： H01L33/24 , B82Y20/00 , G02B6/1225 , H01L33/08
摘要： A light emitting device comprising a substrate and a dielectric structure having at least a two-dimensionally periodic variation of dielectric constant which exhibits a spectrum of electromagnetic modes including guided modes of frequencies below a predetermined frequency cutoff and radiation modes of frequencies above and below said predetermined frequency cutoff, the two-dimensionally periodic variation of dielectric constant of the dielectric structure introducing a band gap between the guided modes. A radiation source, such as a quantum well, is associated with said structure, and generates electromagnetic radiation which couples to the radiation modes resulting in radiation extraction from the structure. The band gap allows the radiation to couple to radiation modes rather than to guided modes resulting in radiation extraction from the structure. The structure can be fabricated such that a radiation reflector is disposed between the structure and the substrate.
摘要翻译：一种发光器件，包括具有至少二维周期性介电常数变化的介质结构和电介质结构，所述介电常数表现出包括低于预定频率截止频率的导频模式的电磁模式谱，以及高于和低于所述预定频率的辐射模式频率截止，介电结构的介电常数的二维周期性变化引入引导模式之间的带隙。诸如量子阱的辐射源与所述结构相关联，并且产生耦合到辐射模式的电磁辐射，从而导致来自结构的辐射提取。带隙允许辐射耦合到辐射模式，而不是引导模式，从而导致从结构的辐射提取。该结构可以被制造成使得辐射反射器设置在结构和衬底之间。

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