I am looking for a cheap, single color, near IR LED/Laser Diode and a receiver photodiode for it, with a center wavelength of about 1550 - 1600 nm to monitor blood glucose absorptions...like this one:
Also I wanted to ask that if one LED is unable to transmit through a finger to a receiving diode, then will more LEDs do the trick, cause the optical power of the above LED is just 2mW ?