Fig. 1From: Polarization-Insensitive Surface Plasmon Polarization Electro-Absorption Modulator Based on Epsilon-Near-Zero Indium Tin OxideThe calculated real part (ε1) and imaginary part (ε2) of the ITO’s permittivity as a function of the wavelength with different average electron concentration NITO. The ENZ point of the wavelength is defined where ε1 crosses zeroBack to article page