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An optical beam splitter is a device that splits a beam of light normally into two parts with the same, or different intensities. The most common form of a beam splitter is a set of two rectangle glass prisms with a small gap in between that reflects half of the light and transmits the other half due to frustrated total internal reflection. Traditional beam splitters suffer from monochromatic limitation (each is designed for a specific wavelength) and they are sensitive to the angle of incidence. Recently, a waveguide structure that is able to divide an input signal into two equal outputs for a broadband spectrum was proposed as a new kind of achromatic beam splitter [1]; it is analogous to the technique of fractional stimulatedRaman adiabatic passage (STIRAP) [2] inquantum optics.

Achromatic multiple beam splitting by adiabatic passage in optical waveguides