Unraveling mode-mode interaction drives spectral performance in multi-mode photonic molecules

Area of Science:

• Photonics
• Optical Physics
• Nanotechnology

Background:

• Multi-mode photonic molecules (MMPMs) offer enhanced light-matter interactions for optical devices.
• Understanding mode-mode coupling is crucial for advancing MMPM technology.

Purpose of the Study:

• To develop a theoretical framework for elucidating mode-mode coupling in MMPMs.
• To validate the model with a plasmonic configuration and assess its performance.

Main Methods:

• Time Coupled Mode Theory (TCMT) was employed to model mode-mode interactions.
• A plasmonic system with coupled slot and ring cavities was designed.
• Symmetry breaking was introduced to optimize spectral properties.

Main Results:

• The TCMT framework successfully elucidated mode-mode interaction relationships.
• The plasmonic configuration demonstrated a 44-fold improvement in the figure of merit (FOM).
• A high sensitivity of 1200 nm/RIU was achieved.

Conclusions:

• The developed theoretical model provides fundamental insights into optical mode interactions.
• The results demonstrate a pathway to high-performance photonic devices through structural optimization.
• This work facilitates the design of advanced functional optical devices based on MMPMs.