Dynamic modulation of slow light by electro-optic effect in photonic crystal coupled resonator optical waveguide

摘要

A novel structure of photonic crystal coupled resonator optical waveguide (PC-CROW) with elliptical rod around cavity is proposed to realize compact, high sensitivity modulated and high-performance buffering application. By adjusting the long axis and short axis of the elliptical rods, the slow light and buffer performance of PC-CROW are optimized. As a_e=0.42a, b_e=0.20a, the group velocity is below 2.3053 × 10~(-4)c, simultaneously, the buffer capacity C and delay time T_s reach the optimum value. Then the dynamic modulation of the slow light and buffer performance based on this optimized structure has been discussed systematically. The guided mode shifts linearly to short wavelength and delay time decreases exponentially as the external modulated voltage increases. And the modulation sensitivities are about 3.0nm/mV and 0.467ns/mV, respectively. These results show that the proposed structure has considerable potential for optical buffering application.