Function field_value 

pub fn field_value(
    polarization: [Complex; 3],
    k: [Complex; 3],
    position: [Complex; 3],
) -> Result<[Complex; 3]>

The field polarization exp(i k·position) of a plane wave from its polarization vector, which polarization gives.

Upstream: treams.special.vpw_M, vpw_N and vpw_A at position.