IPC분류정보
국가/구분 |
United States(US) Patent
등록
|
국제특허분류(IPC7판) |
|
출원번호 |
US-0959704
(2004-10-06)
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등록번호 |
US-7368870
(2008-05-06)
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발명자
/ 주소 |
|
출원인 / 주소 |
- Hewlett Packard Development Company, L.P.
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인용정보 |
피인용 횟수 :
3 인용 특허 :
22 |
초록
▼
Radiation emitting structures that include an active radiation emitter and a passive photonic crystal structure surrounding the emitter are disclosed. The passive photonic crystal structure is transparent to wavelengths of electromagnetic radiation within the visible region of the electromagnetic sp
Radiation emitting structures that include an active radiation emitter and a passive photonic crystal structure surrounding the emitter are disclosed. The passive photonic crystal structure is transparent to wavelengths of electromagnetic radiation within the visible region of the electromagnetic spectrum. Also disclosed are incandescent lamps that include such radiation emitting structures.
대표청구항
▼
What is claimed is: 1. A radiation emitting structure comprising: an active radiation emitter; and a passive photonic crystal structure transparent to wavelengths of electromagnetic radiation within the visible region of the electromagnetic spectrum surrounding the emitter; wherein the passive phot
What is claimed is: 1. A radiation emitting structure comprising: an active radiation emitter; and a passive photonic crystal structure transparent to wavelengths of electromagnetic radiation within the visible region of the electromagnetic spectrum surrounding the emitter; wherein the passive photonic crystal structure comprises a plurality of regions, each region of the plurality of regions exhibiting a photonic bandgap over a range of electromagnetic wavelengths, each range of electromagnetic wavelengths including wavelengths outside the visible region of the electromagnetic spectrum emitted by the emitter when it is heated, the range of the photonic bandgap of each region of the plurality of regions differing from the range of another region. 2. The radiation emitting structure of claim 1, wherein the range of the photonic bandgap of at least one region of the plurality of regions includes wavelengths within the infrared region of the electromagnetic spectrum. 3. The radiation emitting structure of claim 2, wherein the range of photonic bandgap of the at least one region of the plurality of regions includes wavelengths between about 780 nm and about 3000 nm. 4. The radiation emitting structure of claim 1, wherein the passive photonic crystal structure comprises a dielectric material. 5. The radiation emitting structure of claim 4, wherein the dielectric material comprises one of SiO2 and SiN. 6. The radiation emitting structure of claim 1, wherein the passive photonic crystal structure comprises a metal. 7. The radiation emitting structure of claim 6, wherein the metal comprises one of Ag, Au, and W. 8. The radiation emitting structure of claim 1, wherein the passive photonic crystal structure comprises a one-dimensional photonic crystal. 9. The radiation emitting structure of claim 8, wherein the passive photonic crystal structure comprises a Bragg mirror. 10. The radiation emitting structure of claim 9, wherein the Bragg mirror is cylindrical. 11. The radiation emitting structure of claim 10, wherein the Bragg mirror comprises alternating layers of a first material having a first dielectric constant and a second material having a second dielectric constant. 12. The radiation emitting structure of claim 11, wherein the Bragg mirror comprises alternating layers having a thickness of between about 0.05 microns and about 8 microns. 13. The radiation emitting structure of claim 1, wherein the passive photonic crystal structure comprises a two-dimensional photonic crystal. 14. The radiation emitting structure of claim 13, wherein the passive photonic crystal structure comprises a plurality of passive filaments dispersed periodically and circumferentially about the emitter. 15. The radiation emitting structure of claim 14, wherein each passive filament of the plurality of passive filaments comprises one of carbon, silicon carbide, silica, alumina, titania, silver, gold, tungsten, and copper. 16. The radiation emitting structure of claim 15, wherein each passive filament of the plurality of passive filaments has a diameter between about 0.05 microns and about 8 microns. 17. The radiation emitting structure of claim 16, wherein each passive filament of the plurality of passive filaments is separated from other passive filaments by an average distance of between about 0.05 microns and about 8 microns. 18. The radiation emitting structure of claim 1, wherein the passive photonic crystal structure comprises three-dimensional photonic crystal. 19. The radiation emitting structure of claim 18, wherein the lattice structure comprises: a plurality of layers, each layer comprising a plurality of parallel rods, each rod of the plurality of rods oriented substantially perpendicular to the plurality of rods of the layer directly above and directly below; and a matrix material disposed between the plurality of rods. 20. The radiation emitting structure of claim 19, wherein the matrix comprises air. 21. The radiation emitting structure of claim 19, wherein each rod of the plurality of rods has a thickness between about 0.05 microns and about 8 microns, and a width of between about 0.05 microns and about 8 microns. 22. The radiation emitting structure of claim 19, wherein the plurality of rods of each layer are separated by an average distance of between about 0.05 microns and about 8 microns. 23. The radiation emitting structure of claim 1, wherein the emitter comprises an active filament. 24. The radiation emitting structure of claim 23, wherein the active filament comprises tungsten or tungsten alloy. 25. The radiation emitting structure of claim 24, wherein the active filament and the passive photonic crystal structure are coiled. 26. The radiation emitting structure of claim 1, wherein the emitter comprises an active photonic crystal emitter. 27. The radiation emitting structure of claim 26, wherein the active photonic crystal emitter comprises a plurality of active filaments. 28. The radiation emitting structure of claim 27, wherein each active filament of the plurality of active filaments comprises tungsten or tungsten alloy. 29. The radiation emitting structure of claim 27, wherein each active filament of the plurality of active filaments has a diameter between about 0.05 microns and about 8 microns. 30. The radiation emitting structure of claim 27, wherein each active filament of the plurality of active filaments is separated by an average distance between about 0.05 microns and about 8 microns. 31. The radiation emitting structure of claim 26, wherein the active photonic crystal emitter comprises a lattice structure exhibiting dielectric periodicity. 32. The radiation emitting structure of claim 27, wherein the lattice structure comprises: a plurality of layers, each layer comprising a plurality of parallel rods, each rod of the plurality of rods oriented substantially perpendicular to the plurality of rods of the layer directly above and directly below; and a matrix material disposed between the plurality of rods. 33. The radiation emitting structure of claim 32, wherein the matrix material comprises air. 34. The radiation emitting structure of claim 32, wherein each rod of the plurality of rods has a thickness between about 0.05 microns and about 8 microns, and a width of between about 0.05 microns and about 8 microns. 35. The radiation emitting structure of claim 32, wherein the plurality of rods of each layer are separated by an average distance of between about 0.05 microns and about 8 microns. 36. The radiation emitting structure of claim 1, further comprising an intermediate layer of material transparent to electromagnetic radiation within the visible region of the electromagnetic spectrum between the passive photonic crystal and the emitter. 37. The radiation emitting structure of claim 36, wherein the intermediate layer of material is electrically insulating. 38. The radiation emitting structure of claim 37, further comprising two electrical contacts attached to the emitter for connection to a power supply, and wherein the passive photonic crystal structure is electrically isolated from the contacts by the insulating intermediate layer of material. 39. An incandescent lamp comprising a radiation emitting structure, the radiation emitting structure comprising: an emitter; and a photonic crystal structure comprising a plurality of regions, at least one region of the plurality of regions exhibiting a first photonic bandgap that differs from a second photonic bandgap exhibited by at least one other region of the plurality of regions, the photonic crystal structure positioned relative to the emitter to prevent at least one wavelength of electromagnetic radiation emitted by the emitter upon heating from passing through the photonic crystal structure. 40. A radiation emitting structure comprising: a radiation emitter; and a photonic crystal structure at least partially surrounding the radiation emitter, the photonic crystal structure comprising a plurality of regions, at least one region of the plurality of regions exhibiting a first photonic bandgap that differs from a second photonic bandgap exhibited by at least one other region of the plurality of regions. 41. The radiation emitting structure of claim 40, wherein the photonic crystal structure is transparent to at least one wavelength of electromagnetic radiation emitted by the radiation emitter, and at least one of the first photonic bandgap and the second photonic bandgap comprising at least one other wavelength of electromagnetic radiation emitted by the emitter.
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