Body-mountable devices having an optical polarizer

1. A body-mountable device comprising:

a first polymer layer, the first polymer layer comprising a first liquid crystal elastomer;

a structure on the first polymer layer, the structure comprising a sensor; and

a second polymer layer over the first polymer layer and the structure, the second polymer layer comprises a second liquid crystal elastomer,

wherein the first polymer layer defines a first side of a body-mountable device and the second polymer layer defines a second side of the body-mountable device opposite the first side, and

wherein the application of an electric field across the first polymer layer and the second polymer layer causes the body-mountable device to polarize or depolarize in response to the electric field.

2. The body-mountable device of claim 1 , wherein the body-mountable device is in the form of a contact lens.

3. The body-mountable device of claim 1 , wherein one polymer layer is isotropically ordered and the remaining polymer layer is nematically ordered.

4. The body-mountable device of claim 1 , wherein the first and second polymer layers are isotropically oriented.

5. The body-mountable device of claim 1 , wherein the first and second polymer layers are nematically ordered.

6. The body-mountable device of claim 5 , wherein the first or the second polymer layer is nematically ordered with a far field director at an angle that is oriented 45, 90, or 180 degrees to the far field director of the remaining polymer layer.

7. The body-mountable device of claim 1 , wherein the first and second liquid crystal elastomers comprise a silicon-based polymer having mesogens with a dipole moment.

8. The body-mountable device of claim 1 , wherein the first polymer layer, the second polymer layer, or both have a pre-determined orientation.

9. A contact lens comprising:

a first polymer layer, the first polymer layer comprising a first liquid crystal elastomer;

a structure on the first polymer layer, the structure comprising a sensor; and

a second polymer layer over the first polymer layer and the structure, the second polymer layer comprising a second liquid crystal elastomer,

wherein the first polymer layer, the second polymer layer, or both are formed by polymerization of a liquid crystal pre-polymer in the presence of an electric or magnetic field, and

wherein the application of an electric field across the first polymer layer and the second polymer layer causes the contact lens to polarize or depolarize in response to the electric field.

10. The contact lens of claim 9 , wherein a structure is positioned on the first polymer layer prior to forming the second polymer layer.

11. The contact lens of claim 10 , wherein the structure further comprises an electronic component.

12. The contact lens of claim 9 , wherein one polymer layer is isotropically ordered and the remaining polymer layer is nematically ordered.

13. The contact lens of claim 9 , wherein the first and second polymer layers are isotropically oriented.

14. The contact lens of claim 9 , wherein the first and second polymer layers are nematically ordered.

15. The contact lens of claim 14 , wherein the first or the second polymer layer is nematically ordered with a far field director at an angle that is oriented 45, 90, or 180 degrees to the far field director of the remaining polymer layer.

16. The contact lens of claim 9 , wherein the first and second liquid crystal elastomers comprise a silicon-based polymer having mesogens with a dipole moment.

17. The contact lens of claim 9 , wherein the first polymer layer, the second polymer layer, or both have a pre-determined orientation.

18. The contact lens of claim 9 , further comprising electrodes for generating an applied electrical field across the first polymer layer and second polymer layer to polarize or depolarize each polymer layer.