Optical platform to enable efficient LED emission
View Patent ↗An integrated multi-layer apparatus and method of producing the same is disclosed. The apparatus comprises an LED, a beam shaping layer, and a refracting layer between the beam shaping layer from the LED. The refracting layer may have an index of refraction lower than the index of refraction of the LED and the beam shaping layer.
1. An integrated multi-layer apparatus, comprising:
an LED configured to emit light within an angular range and light outside the angular range;
a beam shaping layer configured to pass substantially all the light emitted within the angular region and reflect substantially all the light emitted outside the angular region; and
a refracting layer between the beam shaping layer and the LED.
2. The apparatus of claim 1 wherein the beam shaping layer comprises periodic optical structures.
3. The apparatus of claim 1 wherein the beam shaping layer comprises at least one of a lens, mirror, or prism.
4. The apparatus of claim 1 wherein the beam shaping layer and the LED are arranged to avoid any direct couplings between the two.
5. The apparatus of claim 1 wherein the refracting layer separates the beam shaping layer from the LED by at least 1 λ/nL.
6. The apparatus of claim 1 wherein the refracting layer comprises air.
7. The apparatus of claim 1 wherein the refracting layer has an index of refraction lower than the index of refraction of the LED and the beam shaping layer.
8. The apparatus of claim 1 wherein the LED is further configured to randomly scatter light reflected from the beam shaping layer and redirect the scattered light back to the beam shaping layer.
9. The apparatus of claim 8 wherein the LED further comprises a roughened surface to randomly scatter the light reflected from the beam shaping layer.
10. The apparatus of claim 8 wherein the LED further comprises a back reflector to redirect the scattered light back to the beam shaping layer.
11. An integrated multi-layer apparatus, comprising:
an LED configured to emit light;
a beam shaping layer configured to transmit substantially all of the light which has an angle of incidence less than a threshold angle and reflect substantially all of the light which has an angle of incidence greater than the threshold angle; and
a refracting layer between the beam shaping layer and the LED;
wherein the LED further comprises a roughened surface to randomly scatter the light reflected from the beam shaping layer.
12. The apparatus of claim 11 wherein the beam shaping layer comprises periodic optical structures.
13. The apparatus of claim 11 wherein the beam shaping layer comprises at least one of a lens, mirror, or prism.
14. The apparatus of claim 11 wherein the beam shaping layer and the LED are arranged to avoid any direct couplings between the two.
15. The apparatus of claim 11 wherein the refracting layer separates the beam shaping layer from the LED by at least 1 λ/nL.
16. The apparatus of claim 11 wherein the refracting layer comprises air.
17. The apparatus of claim 11 wherein the refracting layer has an index of refraction lower than the index of refraction of the LED and the beam shaping layer.
18. The apparatus of claim 11 wherein the LED further comprises a back reflector to redirect the scattered light back to the beam shaping layer.
19. An integrated multi-layer apparatus, comprising:
an LED configured to emit light;
a beam shaping layer configured to transmit a first portion of the light and reflect a second portion of the light based on an angle of incidence; and
a refracting layer between the beam shaping layer and the LED.
20. The apparatus of claim 19 wherein the beam shaping layer comprises periodic optical structures.
21. The apparatus of claim 19 wherein the beam shaping layer comprises at least one of a lens, mirror, or prism.
22. The apparatus of claim 19 wherein the beam shaping layer and the LED are arranged to avoid any direct couplings between the two.
23. The apparatus of claim 19 wherein the refracting layer separates the beam shaping layer from the LED by at least 1 λ/nL.
24. The apparatus of claim 19 wherein the refracting layer comprises air.
25. The apparatus of claim 19 wherein the refracting layer has an index of refraction lower than the index of refraction of the LED and the beam shaping layer.
26. The apparatus of claim 19 wherein the LED further comprises a roughened surface and a back reflector.
27. The apparatus of claim 26 wherein the LED further comprises a back reflector to redirect the scattered light back to the beam shaping layer.