Patent ID: 7728278

Claim:
For use in an integrated circuit, a photosensitive cell comprising: an entry face; a photosensitive element; and at least two light-guiding elements disposed between the entry face and the photosensitive element, wherein the second one of the light-guiding elements is disposed between the first element and the entry face, wherein each of the light-guiding elements comprises: an inner volume having at least a first dielectric material and a first surface located on the same side as the photosensitive element; an outer volume having at least a second dielectric material with an optical refractive index lower than the refractive index of the first material; a second surface located on the same side as the entry face, the first surface of the inner volume of the second light-guiding element having a smaller area than that of the second surface of the inner volume of the first light-guiding element; and a lateral surface joining said first surface to said second surface and separating the inner volume from the outer volume, the outer volume surrounding the inner volume over at least part of the lateral surface, wherein the first surface area of the second light guiding element is greater than the first surface area of the first light guiding element.