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(a) Measured reflection spectra for various intensities of electrical current applied. A drastic but continuous spectrum tuning is achieved before saturation. (b,c) Hysteresis in the on-resonance reflectance, which is dependent on the applied electrical current (I), with a sweeping rate of 0.1 A min−1. The corresponding resonance wavelength (λres) as a function of I is shown in the inset.
