Topological Photonic Crystal Sensors: Fundamental Principles, Recent Advances, and Emerging Applications

Area of Science:

• Photonics
• Sensing Technology
• Materials Science

Background:

• Topological photonic sensors integrate topological protection with light confinement (topological states, quasi-bound states in the continuum [quasi-BICs], Tamm plasmon polaritons [TPPs]).
• These sensors demonstrate exceptional sensitivity and high-Q resonances, crucial for precise monitoring.
• Applications span environmental, biomedical, and industrial sensing.

Purpose of the Study:

• To review the foundational physics and diverse architectures of topological photonic sensors.
• To examine working principles, performance metrics, and challenges like ultrahigh-Q operation and multiparameter sensing.
• To propose physics-driven solutions for enhancing sensor capabilities.

Main Methods:

• Review of existing literature on topological photonic sensor physics and design.
• Analysis of various sensor architectures (refractive index, biosensors, gas, thermal).
• Exploration of advanced materials and non-Hermitian systems for improved performance.

Main Results:

• Topological photonic sensors provide ultra-sensitive detection capabilities.
• Key challenges include achieving practical ultrahigh-Q factors and enabling multiparameter sensing.
• Proposed solutions involve integrating novel materials like Weyl semimetals and graphene heterostructures.

Conclusions:

• Topological photonic sensors represent a transformative technology for ultra-sensitive detection.
• Overcoming design complexity and performance limitations is key to widespread adoption.
• Future research directions include exploring non-Hermitian systems and advanced material integration.