Nonlocal electro-optic effects for transverse electric modes in quantum well Mach-Zehnder modulators

摘要

We develop a microscopic nonlocal theory for the electro-optic effect (Pockels effect) and report its effective electrorefractive modulation for transverse electric (TE) waves in a quantum well (QW) waveguide Mach-Zehnder modulator. A general expression for the dielectric function with spatial dispersion for TE modes is derived. Furthermore, it is desirable that a low absorption loss (α < 9.0cm~(-1)) and a large refractive index change (△n ～ 0.00137) are obtained by an optimal bias electric field and QW width. These properties may have extensive applications in the field of optoelectronics.