Yes, this is the figure, with a with a radius of 235–270 nm (y axis) and a wavelength of 1300–1600 nm (x axis)...I took a screenshot directly from lumerical and did not process it in Matlab. I just want to show that I think it is not the phase delay spectrum.Â
here is the paper for your reference: http://www.koenderink.info/reading/Deckerhuygens.pdf
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