A plastic container having a container body and a permanently attached container lid is provided. The optical absorber includes at least one electrically conductive layer extending on the platform over and in thermal contact with the at least one thermistor and patterned to form a resonant structure defining an absorption spectrum of the uncooled microbolometer detector. The unit prisms have a predetermined shape of a cross section, and are arranged with orientation. A tip is formed at the distal end of the inner member.