Design of slotted high quality factor photonic-crystal nanocavities embedded in electro-optic polymers

Abstract

We improve design quality factors of slotted photonic crystal nanocavities embedded in electro-optic polymers (EOPs), which enables control of resonant wavelengths without the use of light-absorbing free carriers. We form nanocavities by modifying single- and double-slotted line-defect waveguides with lattice-constant modulations analytically determined based on dispersions of the waveguides. A double-slotted nanocavity achieves a fourfold increase in Q factor (36 million) compared to a single-slotted nanocavity with similar modulation of lattice constants. Both structures can realize large concentration of light in the EOP region (50%), and resonant wavelength modulations of ∼0.01% are expected with applied voltage of 2 V.

Statistical evaluation of Q factors of fabricated photonic crystal nanocavities designed by using a deep neural network

“…Owing to this design approach, the loss determined by the cavity design itself is significantly reduced and the median of the experimental Q factors was improved by about 1 million (from 6.9 × 10 6 to 7.8 × 10 6 ). We believe that optimization with aid of a deep neural network can also increase the experimental Q factors of other types of nanocavities, [29][30][31][32] which will be useful in various scientific and engineering fields.…”

On‐Chip Dual Electro‐Optic and Optoelectric Modulation Based on ZnO Nanowire‐Coated Photonic Crystal Nanocavity

“…The photonic crystal slot waveguide was formed by removing a row of air holes from the crystal and etching an air slot with width of 100 nm and depth of 400 nm. The photonic crystal slot waveguide provides a broadband waveguiding mode with an electric field that is mainly confined within the air slot region because of the continuity requirement of the electric displacement vector at the interface . The photonic crystal nanocavity structure was fabricated by removing three adjacent air holes and adjusting the radii and relative locations of the surrounding air holes.…”