All optical modulation and switching with patterned optically absorbing polymers

• US 8,798,406 B1
• Filed: 11/25/2009
• Issued: 08/05/2014
• Est. Priority Date: 03/05/2008
• Status: Expired due to Fees

• Current Assignee: University of Washington
• Original Assignee: University of Washington
• Inventors: Hochberg, Michael J., Baehr-Jones, Tom
• Primary Examiner(s): WONG, ERIC K
• Application Number:
  US12/626,561
• Time in Patent Office: 1,714 Days
• Field of Search: 385 1- 2
• US Class Current: 385/2
• CPC Class Codes: B82Y 20/00 Nanooptics, e.g. quantum optics or photonic crystals
• CPC Class Codes: G02B 6/12007 forming wavelength selective elements, e.g. multiplexer, demultiplexer
• CPC Class Codes: G02B 6/1223 high refractive index type, i.e. high-contrast waveguides
• CPC Class Codes: G02F 1/065 in an optical waveguide structure
• CPC Class Codes: G02F 1/3515 All-optical modulation, gating, switching, e.g. control of a light beam by another light beam G02F1/353, G02F1/37, G02F1/39 take precedence
• CPC Class Codes: G02F 1/3534 Three-wave interaction, e.g. sum-difference frequency generation G02F1/3532 takes precedence
• CPC Class Codes: G02F 2203/13 involving THZ radiation
• CPC Class Codes: G02F 3/00 Optical logic elements; Optical bistable devices

Abstract

All-optical processing devices that include patterned optically active polymers. The devices that are constructed according to principles of the invention include at least one optical input port and at least one optical output port, respectively configured to accept optical input signals and provide optical output signals. The devices include optically active material such as organic polymers that interact with illumination at a first wavelength to change at least one optical property in a non-linear manner. The optically active polymer can be placed adjacent one or more waveguides that allow the input illumination to propagate. As the optical property of the optically active material is changed by the incident illumination, the propagating illumination undergoes a modulation or change in phase, thereby providing an optical output signal having a desired relation to the optical input signal, such as the result of a logical or a computational operation.

Claims

1. Optical logic, the optical logic comprising:

an optical input configured to accept an optical signal as input;

an optical output configured to provide a modulated optical signal as output; and

a plurality of optical gates between the optical input and the optical output, the plurality of optical gates comprising;

a first optical gate including a first waveguide adjacent an insulting surface of a substrate and a first absorptive polymer material, wherein the first absorptive polymer material is configured to shift an index of refraction of at least a portion of the first waveguide responsive to a first gate signal; and

a second optical gate coupled to the first optical gate, wherein the second optical gate includes a second waveguide adjacent the insulating surface of the substrate and a second absorptive polymer material, wherein the second absorptive polymer material is configured to shift an index of refraction of at least a portion of the second waveguide responsive to a second gate signal.

2. The optical logic of claim 1, wherein each of said gates is configured to permit said optical input signal to interact with at least another optical signal.

3. The optical logic of claim 1, wherein said first and second waveguides are ridge waveguides, a rib waveguides, a slot waveguides, or combinations thereof.

4. The optical logic of claim 3, wherein said first and second waveguides are slot waveguides having at least two stripes defining said slot;

and at least some of said first and second absorptive polymer is situated within said respective slots.

5. The optical logic of claim 1, wherein said substrate is a silicon substrate.

6. The optical logic of claim 5, wherein said insulating surface comprises silicon and oxygen.

7. The optical logic of claim 1, wherein said substrate is selected from one of silicon-on-insulator (SOI) and silicon-on-sapphire (SOS).

8. The optical logic of claim 4, wherein said slots are less than or equal to 100 nanometers in width.

9. The optical logic of claim 1, wherein said optical input comprises an input waveguide for coupling optical radiation into said first or second waveguide.

10. The optical logic of claim 1, wherein said optical logic comprises an AND gate, an OR gate, a NAND gate, a NOR gate, an XOR gate, or combinations thereof.

11. The optical logic of claim 1, wherein said optical logic comprises an optical latch, an optical memory, or combinations thereof.

12. The optical logic of claim 1, wherein said optical logic comprises a variable delay line.

13. The optical logic of claim 1, wherein said optical logic comprises a self-oscillator.

14. The optical logic of claim 1, wherein said optical logic comprises a multiplexer.

15. The optical logic of claim 1, wherein said optical logic comprises a demultiplexer.

16. The optical logic of claim 1, wherein said optical logic comprises a clock, a clock multiplier, or combinations thereof.

17. The optical logic of claim 1, wherein said first and second absorptive polymers are infiltrated into a slot of a respective slot waveguide.

18. The optical logic of claim 1, wherein said first and second absorptive polymers, upon absorbing single or multiple photons of a particular frequency, produce a change in refractive index or dielectric constant for propagating modes of another frequency.

19. The optical logic of claim 1, wherein a system comprises a plurality of such devices on the same substrate, each of which may comprise different absorptive polymers.

20. The optical logic of claim 1, wherein the first and second absorptive polymers comprise a same polymer material.

21. The optical logic of claim 1, wherein the first and second absorptive polymers comprise different polymer materials.

22. The optical logic of claim 1, wherein an output of the first gate is provided to the second gate as the second gate signal.