Light emitting device utilizing a periodic dielectric structure
First Claim
1. A light emitting device comprising:
- a substrate;
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; and
a radiation source associated with said structure, said radiation source generating electromagnetic radiation of frequencies above said predetermined frequency cutoff which couples to radiation modes of frequencies above said predetermined frequency cutoff resulting in radiation extraction from said structure.
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Abstract
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.
339 Citations
28 Claims
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1. A light emitting device comprising:
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a substrate; 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; and a radiation source associated with said structure, said radiation source generating electromagnetic radiation of frequencies above said predetermined frequency cutoff which couples to radiation modes of frequencies above said predetermined frequency cutoff resulting in radiation extraction from said structure. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13)
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14. A light emitting device comprising:
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a substrate; 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, said two-dimensionally periodic variation of dielectric constant of said dielectric structure introducing a band gap between said guided modes; and a radiation source associated with said structure, said radiation source generating electromagnetic radiation which couples to said radiation modes resulting in radiation extraction from said structure, wherein said band gap allows said radiation to couple to radiation modes rather than to guided modes resulting in radiation extraction from said structure. - View Dependent Claims (15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26)
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27. A light emitting device comprising:
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a substrate; a dielectric structure having at least a two-dimensional 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; and a radiation source associated with said structure, said radiation source generating electromagnetic radiation of frequencies above said predetermined frequency cutoff which couples to radiation modes of frequencies above said predetermined frequency cutoff resulting in radiation extraction from said structure.
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28. A light emitting device comprising:
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a substrate; a dielectric structure having at least a two-dimensional variation of dielectric constant which exhibits a spectrum of electromagnetic modes including guided modes and radiation modes, said two-dimensional variation of dielectric constant of said dielectric structure introducing a gap between said guided modes; and a radiation source associated with said structure, said radiation source generating electromagnetic radiation which couples to said radiation modes resulting in radiation extraction from said structure, wherein said gap allows said radiation to couple to radiation modes rather than to guided modes resulting in radiation extraction from said structure.
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Specification