Regarding the infrared transmitter for Optical Beam smoke detector upto 100 metres

Dear Sir,

I want to design Infrared Optical Beam Smoke detector upto 100 metres. can you please suggest me a IR transmitter which covers upto 100 metres? Please let me know.

IR Transmitter -------------------------------> Receiver
100 metres
Regards,
V. Prakash

Any IR transmitter will radiate energy to an infinite distance, whether there is enough energy at 100m to be detected is down to the receiver design and the various losses of the beam.
Frank