Selective etching through a photostructured mask forms waveguide channels that reduce scattering and alignment defects.
Interleaved electro-optic layers and stable interlayers prevent cryogenic phase transitions, preserving EO coefficients for faster, lower-power modulation.
Deep substrate trenches and deposited buffer layers align waveguides in x, y, and z while improving optical interconnect reliability.
Thick undercladding limits heater heat loss to the silicon substrate, reducing power consumption in thermo-optic phase shifting.
Anodic bonding makes the PIC a vacuum-envelope wall, reducing contamination and preserving high vacuum for precise light-atom interactions.
Atomically smooth etched trenches support aluminum pathways, reducing defects and improving light detection efficiency in photonic integrated circuits.
A low-refractive-index layer separates the crystal from the amorphous bond, limiting light leakage and adhesive-related cracking.
Single-layer silicon nitride gratings struggle with dual-channel filtering; different pitches across antisymmetric layers reflect separate bands and pass others.
High-index cladding confines the optical field, enabling closer electrodes to improve overlap while limiting metal-induced optical loss.
UV femtosecond laser patterning forms reverse ribbed glass waveguides for tighter bends, lower loss, and efficient PIC coupling.