pado.optical_element.phase2height

phase2height(phase_u, wvl, RI, minh=0)

Convert phase to the least equivalent material height at or above minh. The ambient refractive index is 1. Whole phase periods are added as needed; the phase-to-height mapping is not unique without this minimum-height rule.

Parameters:

• phase_u – Phase change tensor, in radians.

• wvl – Wavelength in metres.

• RI – Refractive index of the material. RI == 1 raises ValueError.

• minh – Minimum height in metres; defaults to zero.

Return type:

torch.Tensor