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. 2021 Jul 21;14(15):4065. doi: 10.3390/ma14154065

Figure 9.

Figure 9

Threshold modal spectra for a PHC structures with HMM structures revealing type II hyperbolic dispersion and biased with external voltage Vg = 4.5 V (a), 5.0 V (b), 5.5 V (c) and 6.0 V (d).