Structure and method for processing optical energy

• US 6,836,494 B1
• Filed: 05/31/2000
• Issued: 12/28/2004
• Est. Priority Date: 05/31/2000
• Status: Expired due to Term

• Current Assignee: RPX Corporation
• Original Assignee: Lucent Technologies, Inc. (Nokia Corporation)
• Inventors: Stuart, Howard Roy
• Primary Examiner(s): Wong, Don
• Assistant Examiner(s): VY, HUNG T
• Application Number:
  US09/584,585
• Time in Patent Office: 1,672 Days
• Field of Search: 372/39, 372/43, 257/98, 385/14, 385/129, 437/129, 438/478
• US Class Current: 372/39
• CPC Class Codes: G02F 1/353 Frequency conversion, i.e. wherein a light beam is generated with frequency components different from those of the incident light beams
• CPC Class Codes: G02F 1/3548 Quasi phase matching [QPM], e.g. using a periodic domain inverted structure
• CPC Class Codes: H01S 3/06 Construction or shape of active medium
• CPC Class Codes: H01S 3/08 Construction or shape of optical resonators or components thereof

Abstract

A structure and method of enhancing optical emissions and optical energy comprising a metal layer having a first surface comprising a plurality of voids, said voids having a dimension less than the wavelength of optical energy being processed.

Claims

1. An optical structure for processing optical energy comprising:

a metal layer having a first surface comprising a plurality of voids having a dimension less than the wavelength of optical energy being processed;

a first material taken from the group consisting of an active and a non-linear material substantially adjacent to at least a portion of the metal layer in the area of the plurality of voids wherein the plurality of voids in the metal layer exhibit localized resonances that enhance emission and absorption of optical energy through the first material; and

a substrate for supporting the metal layer.

2. The structure of claim 1 wherein said voids are concave and indentations.

3. The structure of claim 1 wherein said voids extend from the first surface to a second surface of said metal layer.

4. The structure of claim 3 wherein said voids are cylindrical holes passing through said metal layer.

5. The structure of claim 4 wherein said voids have a diameter of from about 10 nm to about 1 micron.

6. The structure of claim 1 wherein said voids are arranged in an ordered array.

7. The structure of claim 6 wherein said voids are arranged in a triangular array.

8. The structure of claim 7 wherein said voids arranged in an ordered array produce a phased matched effect.

9. The structure of claim 1 wherein said metal layer is greater than 50 nm thick.

10. The structure of claim 1 wherein the first material is placed adjacent the voids.

11. The structure of claim 1 wherein the first material is placed inside said voids.

12. The structure of claim 1 wherein the first material is in the form of a layer on top of said metal layer.

13. The structure of claim 1 wherein the first material comprises one or more layers comprising materials taken from the group consisting of an active material and a non-linear material placed between a substrate and said metal layer.

14. The structure of claim 1 wherein the first material is placed at least partially in the voids.

15. The structure of claim 1 wherein the first material fills the voids.

16. The structure of claim 1 which is in the form of a laser, an LED, a wavelength converter, a sensor or a switch.

17. A method for processing optical energy comprising directing optical energy at a first surface of a metal layer, said surface comprising one or more voids having a dimension less than the wavelength of optical energy being processed and an first material taken from the group consisting of an active material and a non-linear material substantially adjacent to at least a portion of the plurality of voids.

18. The method of claim 17 wherein the voids are formed in the first surface of the metal layer in an ordered array.

19. The method of claim 17 wherein the voids are filled with a gain material.

20. The method of claim 17 wherein the gain material is placed adjacent the voids.

21. The method of claim 17 using a gain layer placed in between a substrate layer and a metal layer.

22. The method of claim 17 wherein the voids are filled with a non-linear material.

23. The method of claim 17 wherein the non-linear material is placed adjacent the voids.

24. The method of claim 17 using a non-linear material placed in between a substrate layer and a metal layer.

25. The method of claim 17 further comprising optical plumbing.

26. The method of claim 17 further comprising phase matching to form optical second harmonic generation.

27. A laser comprising:

a metal layer having a first surface comprising a plurality of voids, said voids having a dimension less than the wavelength of optical energy being processed;

an active material substantially adjacent to at least a portion of the metal layer in the area of the plurality of voids wherein the plurality of voids in the metal layer exhibit localized resonances that enhance emission of optical energy through the active material; and

a substrate for supporting the metal layer.

28. An LED structure comprising:

a metal layer having a first surface comprising a plurality of voids, said voids having a dimension less than the wavelength of optical energy being processed;

an active material substantially adjacent to at least a portion of the metal layer in the area of the plurality of voids wherein the plurality of voids in the metal layer exhibit localized resonances that enhance emission of optical energy through the active material; and

a substrate for supporting the metal layer.

29. An optical switch structure comprising:

a metal layer having a first surface comprising a plurality of voids, said voids having a dimension less than the wavelength of optical energy being processed;

a non-linear material substantially adjacent to at least a portion of the metal layer in the area of the plurality of voids wherein the plurality of voids in the metal layer exhibit localized plasma resonances that enhance emission of optical energy through the non-linear material; and

a substrate for supporting the metal layer.