A detector (2) for detecting photoluminescence from a sample (104), the detector (28) comprising an array of photo-sensitive detectors configured to receive photoluminescence, at least one photo-sensitive detector being provided with a first type of linear polarization filter (40) and at least one photo-sensitive detector being provided with a second type of linear polarization filter(40), wherein said first type of linear polarization filter has a plane of polarization which is at angled with respect to a plane of polarization of said second type of polarization filter.