Image sensor and manufacturing method thereof

1. An image sensor, comprising:

an image sensing substrate including:

an image sensing device;

a first sensor pixel and a second sensor pixel adjacent to the first sensor pixel; and

a divider between the first sensor pixel and the second sensor pixel,

a light guiding grid above and vertically aligning with the divider;

wherein the image sensing substrate has a refractive index; the divider has a refractive index; and the substrate's refractive index is greater than the divider's refractive index.

2. The image sensor of claim 1 , further comprising an anti reflection coating (ARC) between the divider and the light guiding grid.

3. The image sensor of claim 1 , wherein the divider includes dielectric material.

4. The image sensor of claim 1 , further comprising a boundary between the first sensor pixel and the second sensor pixel, wherein the divider is symmetrical with reference to the boundary.

5. The image sensor of claim 1 , wherein a light guiding grid being above and vertically aligning with the divider, and the divider having sections separating from one another.

6. The image sensor of claim 1 , wherein the divider aligns with the light guiding grid.

7. The image sensor of claim 1 , wherein a width of the divider is between about one half and about two times of a width of the light guiding grid.

8. The image sensor of claim 1 , wherein a height of the divider is between about one half and about two times of a height of the light guiding grid.

9. The image sensor of claim 1 , wherein a top surface of the divider is below a surface of the image sensing substrate.

10. The image sensor of claim 1 , further comprising an interface between the light guiding grid and the image sensing substrate, wherein the divider is not in contact with the interface.