| 摘要 |
A photo diode is provided, which can polarize incident light before the light is sensed by the light-sensitive area of the photo diode so that the photo diode is capable of detecting the intensity of the light that is polarized in a specific direction. The photo diode includes a light-sensitive structure which can be a conventional photo diode, and at least one conductive grating formed over the light-sensitive structure, with the conductive grating having a plurality of substantially parallel and equally spaced conductive strips formed from a conductive material. The conductive grating can attenuate the intensity of the light that is polarized in parallel to the conductive grating before the light is sensed by the light-sensitive structure, thereby allowing only those components that are polarized in the direction perpendicular to the conductive grating to pass therethrough. The photo diode is therefore capable of detecting the intensity of the light that is polarized in a specific direction.
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