10 feet IR to transmit and recieve

Hi there, i wanted to do a project based on Infrared, i want to be able to transmit the signal to 10 - 15 feet and if an object is between that the infrared would reflect back on to the photo diode sensor.

How would i go by this?
It seems that i would need to use two lenses, one from the transmission and another for the sensor. So they both would meet and then the receiving signal would get amplified after going through sensor. However it would be better if infrared light transmission to be wider, an average face size although im not sure if achievable.

If that is correct what would i need to achieve that? If not then what would be the correct way to achieve this?

Thanks