Light emitting device with a photonic crystal
AssigneeHan Shin Company, Ltd.
InventorsChung-Hsiang Lin, Chia-Feng Lin
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Abstract
A light emitting device includes a photonic crystal having a periodic pattern of elements exhibiting a spectrum of electromagnetic modes that includes guided modes of frequencies below a predetermined cutoff frequency, and radiation modes of frequencies below and above the cutoff frequency. A radiation source is associated with the photonic crystal. Each of the elements is covered by a reflective layer so as to introduce at least an omnidirectional photonic band gap between the guided modes and so as to permit coupling of the radiation to the radiation modes rather than to the guided modes.
Claims17
A light emitting device comprising:
- a photonic crystal including a periodic pattern of elements that imparts a periodic variation in dielectric constant to said photonic crystal, said periodic variation in dielectric constant exhibiting a spectrum of electromagnetic modes that includes guided modes of frequencies below a predetermined cutoff frequency, and radiation modes of frequencies below and above the cutoff frequency;
- and
- a radiation source associated with said photonic crystal in such a manner so as to generate electromagnetic radiation within said photonic crystal;
- each of said elements being covered by a reflective layer in such a manner so as to introduce at least an omnidirectional photonic band gap between said guided modes for a frequency range of the radiation generated by said radiation source and so as to permit coupling of the radiation for said frequency range to said radiation modes rather than to said guided modes, thereby resulting in radiation extraction from said photonic crystal.
Dependencies are inferred from the claim text.