An infrared (IR) sensor package includes a heat sink defining a first interior space and a radiation trap adjacent the first interior space. An IR sensor having a radiation-sensitive region which detects IR radiation is arranged within the first interior space of the heat sink. A first optical element and a second optical element are arranged at respective ends of the radiation trap. The radiation trap is configured to allow for the passage of a first portion of IR radiation incident the second optical element, through the first optical element, and into communication with the IR sensor element, and to absorb a second portion of IR radiation incident the second optical element.