Question: 3) A wave-plate was constructed by etching a sub-wavelength grating into GaN (n=2.4), giving 50% GaN and 50% air. Using the effective medium approximation for

3) A wave-plate was constructed by etching a sub-wavelength grating into GaN (n=2.4), giving 50% GaN and 50% air. Using the effective medium approximation for parallel plates (L_x=0 and L_y=1) in the latest notes, estimate the birefringencen.

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