Tilted-potential photonic crystal cavities for integrated quantum photonics

Area of Science:

• Quantum photonics
• Nanophotonics
• Solid-state physics

Background:

• Integrated quantum photonics requires efficient light-matter interfaces.
• Photonic crystal (PhC) cavities offer strong light confinement.
• Tailoring optical modes is crucial for advanced quantum applications.

Purpose of the Study:

• To propose and investigate a new type of PhC cavity for integrated quantum photonics.
• To achieve tailored optical modes with both confined and extended spatial components.
• To optimize single photon extraction and transmission in quantum devices.

Main Methods:

• Fabrication of elongated PhC cavities with quasi-linear effective refractive index variation via systematic lateral hole shifts.
• Numerical simulations of Airy-Bloch modes.
• Spectrally resolved near-field pattern measurements.
• Selective excitation of modes using site-controlled quantum dots.

Main Results:

• Demonstrated PhC cavities supporting Airy-Bloch modes with single-peak, extended-tail envelopes.
• Experimental validation of predicted spatial and resonance wavelength behavior.
• Analysis of fabrication disorder effects on mode characteristics.
• Successful selective excitation of Airy-Bloch modes using quantum dots.

Conclusions:

• The proposed tilted-potential PhC cavity enables tailored optical modes for enhanced quantum photonics.
• Airy-Bloch modes are suitable for optimizing single photon extraction and transmission.
• The platform is promising for developing advanced integrated quantum devices, including multi-emitter systems using wavelength division multiplexing.