Polarization direction of optical devices using selected spatial configurations
View Patent ↗A GaN based light emitting diode device which emits polarized light or light of various degrees of polarization for use in the creation of optical devices. The die are cut to different shapes, or contain some indicia that are used to represent the configuration of the weak dipole plane and the strong dipole plane. This allows for the more efficient manufacturing of such light emitting diode based optical devices.
1. A method for indicating a dipole configuration of an LED device provided on a gallium-containing substrate, the method comprising:
determining a dipole configuration of an LED device provided on a substrate, the LED device being configured to emit electromagnetic radiation having a weak dipole plane and a strong dipole plane; and
forming one or more indicia on the gallium-containing substrate to correlate the weak dipole plane, the strong dipole plane, or both the weak and the strong dipole plane to the one or more indicia;
wherein the one or more indicia comprises a shape including a width and a length, the width (W) and the length (L) being different in magnitude, wherein the shape is similar to a rectangular shape in which one side is cut at an angle.
2. The method of claim 1 , wherein the one or more indicia comprises one or more marks on either of one of the faces of the device or substrate.
3. The method of claim 1 , wherein the weak dipole plane is orthogonal to the strong dipole plane, the strong dipole plane being parallel or perpendicular to the width of the gallium-containing substrate.
4. The method of claim 1 , wherein the gallium-containing substrate comprises a gallium species and a nitrogen species.
5. The method of claim 1 , wherein the gallium-containing substrate is a gallium nitride (GaN) substrate.
6. The method of claim 5 , wherein the GaN substrate comprises a semipolar GaN substrate.
7. The method of claim 5 , wherein the GaN substrate comprises a non-polar GaN substrate.
8. The method of claim 1 , wherein the length and the width are characterized by an aspect ratio (L/W) of 1.5 and greater.
9. The method of claim 1 , wherein the length and the width are characterized by an aspect ratio (L/W) of 2 and greater.
10. The method of claim 1 , wherein the LED device is formed on a semi-polar plane of the gallium-containing substrate.
11. The method of claim 1 , wherein the LED device is formed on a non-polar plane of the gallium-containing substrate.
12. The method of claim 1 , wherein the gallium-containing substrate is characterized by a wurtzite crystalline structure.
13. A method for indicating a dipole configuration of a plurality of LED devices provided on a gallium-containing substrate, the method comprising:
determining a dipole configuration of each of the plurality of LED devices, each of the plurality of LED devices being configured to emit electromagnetic radiation having a weak dipole plane and a strong dipole plane; and
cutting one or more of the plurality of LED devices to provide one or more indicia on the gallium-containing substrate to correlate the weak dipole plane, the strong dipole plane, or both the weak and the strong dipole plane to the one or more indicia;
wherein the one or more indicia comprises a shape including a width and a length, the width (W) and the length (L) being different in magnitude, wherein the shape is similar to a rectangular shape in which one side is cut at an angle.
14. The method of claim 13 , wherein each of the plurality of LED devices is configured to emit the polarized electromagnetic radiation in a common direction.
15. The method of claim 13 , wherein the weak dipole plane is orthogonal to the strong dipole plane, the strong dipole plane being parallel or perpendicular to the width of the gallium-containing substrate.
16. The method of claim 13 , wherein the gallium-containing substrate comprises a gallium species and a nitrogen species.
17. The method of claim 13 , wherein the LED device is formed on a semi-polar plane of the gallium-containing substrate.
18. The method of claim 13 , wherein the LED device is formed on a non-polar plane of the gallium-containing substrate.
19. A method of assembling an optical device from a plurality of LED devices, comprising:
providing a plurality of LED devices wherein,
each of the plurality of LED devices is provided on a gallium-containing substrate and is configured to emit electromagnetic radiation having a weak dipole plane and a strong dipole plane; and
each of the plurality of LED devices comprises one or more indicia on the gallium-containing substrate to correlate the weak dipole plane, the strong dipole plane, or both the weak and the strong dipole plane to the one or more indicia;
wherein the one or more indicia comprises a shape including a width and a length, the width (W) and the length (L) being different in magnitude, wherein the shape is similar to a rectangular shape in which one side is cut at an angle; and
orienting each of the plurality of LED devices based on the one or more indicia.