Figure 4 | Scientific Reports

Figure 4

From: Wavelength-adaptable effective q-plates with passively tunable retardance

Figure 4

Consider the sequence of q-plates arranged as in case (b). Let the outer q-plates be of identical retardance \({{\rm{\Gamma }}}_{1}\) and the central q-plate be \({{\rm{\Gamma }}}_{2}\) (see Fig. 1b). The graph shows the possibility of realizing an effective retardance (a) \({{\rm{\Gamma }}}_{e}=\frac{\pi }{2}\) and (b) \({{\rm{\Gamma }}}_{e}=\pi \) at different values of \(({{\rm{\Gamma }}}_{1},{{\rm{\Gamma }}}_{2})\). The dotted line across the diagonal describes the equation \({{\rm{\Gamma }}}_{1}={{\rm{\Gamma }}}_{2}\) and the color coding depicts relative off-set angle \({\rm{\Delta }}{\alpha }_{0}\) at which these effective retardances are realized.

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