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Waveguide-coupled Square Micropillar Resonator-based Devices: Channel Filters and Electro-optic Switches with Embedded p-i-n Diodes

We report our numerical calculations and initial experiments on waveguide-coupled square micropillar resonator-based devices. Our calculations using two-dimensional finite-difference time-domain simulations and Fourier analysis show that waveguide coupling to a micropillar with a long flat coupling sidewall enables desirable directional wavevectors in the micropillar, and thus potentially gives rise to preferentially coupled modes in waveguide-coupled large-size square micropillar resonators. Our initial experiments on silicon-based waveguide-coupled large-size square micropillar resonator-based filters, with tailored cavity corners, reveal only 2-3 modes. We also experimentally demonstrate injection-type square micropillar resonator-based silicon electro-optic switches using laterally integrated p-i-n diodes across the entire square microcavity. By applying a 4 V forward-bias driving voltage, we obtain a resonance wavelength blueshift of ~0.54 nm. We measure the device bandwidth to be about 2 MHz, primarily limited by a wide intrinsic region