Are you looking for Side-looking Infrared Emitters and IR Detectors? What’s great about these devices is that they operate at 940nm, also, they can work at a super high level for generic IR systems, such as remote control and touch-less object sensing. Variable readings can be easily collected from the detector through simply using a simple ADC on any microcontroller which allows in doing that. And just as with any LED device, the emitters provided right here can also be driven up to 50mA with a current limiting resistor. One more thing! Detectors are NPN transistors which depend on incoming IR light.
Sold as a pair, with one Emitter and one Detector.
Product pictures and description are of Sparkfun.com