Broadband and robust optical waveguide devices using coherent tunnelling adiabatic passage

Area of Science:

• Photonics and optical engineering
• Quantum optics
• Waveguide technology

Background:

• Coherent tunnelling adiabatic passage (CTAP) is a technique for efficient photon transfer.
• Existing optical waveguide structures for CTAP face challenges with material loss and parameter sensitivity.
• Advanced waveguide designs are needed for robust and versatile photon manipulation.

Purpose of the Study:

• To numerically demonstrate a robust optical waveguide structure for CTAP.
• To introduce a novel five-rib waveguide for octave-spanning power division.
• To investigate the resilience of the proposed waveguide to material loss and parameter variations.

Main Methods:

• Numerical simulations of light propagation in multi-rib optical waveguide structures.
• Analysis of coupling schemes for coherent tunnelling adiabatic passage.
• Assessment of waveguide performance under varying material loss and geometric parameters.

Main Results:

• A three-rib optical waveguide structure demonstrates robustness against material loss and parameter variations.
• A five-rib optical waveguide structure is presented as a new class of octave-spanning power divider.
• The proposed structures enable efficient and controlled photon transfer via CTAP.

Conclusions:

• The demonstrated optical waveguide structures offer significant advantages for coherent photon manipulation.
• The robustness of the three-rib design makes it suitable for practical applications.
• The five-rib design opens new possibilities for broadband optical power division.