Multiply resonant photonic crystal nanocavities for nonlinear frequency conversion

Area of Science:

• Photonics and Optical Engineering
• Materials Science
• Nonlinear Optics

Background:

• Photonic crystal nanocavities are crucial for manipulating light at the nanoscale.
• Nonlinear frequency conversion is essential for generating new optical frequencies.
• Existing platforms often face limitations in efficiency and tunability.

Purpose of the Study:

• To introduce a novel photonic crystal nanocavity design.
• To demonstrate its capability as a platform for nonlinear frequency conversion.
• To characterize the optical properties of cavities with multiple resonances.

Main Methods:

• Fabrication of photonic crystal nanocavities.
• Optical characterization of resonant modes.
• Nonlinear optical measurements for frequency conversion.
• Design and simulation of cavity structures.

Main Results:

• Demonstrated a photonic crystal nanocavity with multiple, spatially overlapping resonances.
• Achieved nonlinear characterization of structures with nearly degenerate resonant frequencies.
• Showcased structures with resonances separated by up to 523 nm, indicating broad applicability.

Conclusions:

• The developed photonic crystal nanocavity offers a versatile platform for nonlinear frequency conversion.
• The design facilitates efficient light-matter interactions through engineered resonant modes.
• This work opens avenues for advanced optical signal processing and frequency generation.