Its difficult to provide input, you don't say what your application is and there is no link to the datasheet for that part ( I didn't see anything relevant using a google search for PD3122FE000F datasheet)
But if you want a closely spaced array of optical sensors you could consider using the CCD array from an optical mouse. There are a few articles on how to interface them, such as this one: http://meuk.spritesserver.nl/projects/mouseeye/
It may be a very cheap way to prototype and test your concept.