Photonic crystal nanofishbone nanocavity

Area of Science:

• Photonics
• Nanotechnology
• Materials Science

Background:

• Photonic crystal (PhC) nanocavities are crucial for light confinement.
• Achieving high quality (Q) factors and small mode volumes is essential for advanced photonic devices.
• Existing designs face challenges in balancing Q factor, mode volume, and fabrication complexity.

Purpose of the Study:

• To propose and analyze a novel photonic crystal nanofishbone (NFB) nanocavity.
• To demonstrate its capability in confining ultrahigh Q transverse-magnetic (TM) modes.
• To compare its performance against conventional PhC nanobeam nanocavities.

Main Methods:

• Theoretical analysis and simulation of the NFB nanocavity structure.
• Investigation of TM mode confinement properties.
• Comparison of Q factor, confinement factor, and mode volume with nanobeam cavities.

Main Results:

• The NFB nanocavity confines an ultrahigh Q (~1.8 × 10^7) TM mode.
• It exhibits higher Q, larger confinement factor, and smaller mode volume than nanobeam cavities.
• The NFB nanocavity achieves this with thin slab thickness and fewer PhC periods, reducing etched surface area.

Conclusions:

• The proposed PhC NFB nanocavity offers superior performance for TM modes.
• Its compact size and high Q factor make it ideal for quantum cascade lasers and plasmonic nanolasers.
• This technology advancement is beneficial for integrated photonic circuits and on-chip light sources.