Radiation Pressure and Momentum Transfer in Dielectrics: The Photon Drag Effect

Rodney Loudon, Stephen M. Barnett, C. Baxter

Physical Review A, 71, 063802 (2005)

The momentum transfer from light to a dielectric material in the photon drag effect is calculated by evaluation of the relevant Lorentz force. In accordance with measurements on Si and Ge, the material is taken as a two-component optical system, with charge carriers described by an extinction coefficient in a host semiconductor described by real refractive indices (phase) and (group). The calculated momentum transfer to the charge carriers alone has the value per photon, the so-called Minkowski value, found experimentally. The time-dependent Lorentz force is calculated for light in the form of a narrow-band singlephoton pulse. When the pulse is much shorter than the attenuation length, which is much shorter than the sample thickness, there is a clear separation in time between surface and bulk contributions to the forces. The total bulk momentum transfer (charges plus host) in this case is found to be , the so-called Abraham value.