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Inverse-designed BaCO3/TiN optical Tamm state sensors with enhanced refractive index sensitivity
Optics Express
|July 2, 2026
Summary
This study introduces an optimized Optical Tamm state (OTS) sensor for refractive index sensing. The novel BaCO3/TiN/analyte/(SiO2/TiO2) structure demonstrates enhanced sensitivity and figure of merit (FOM) for biosensing applications.
Area of Science:
- Nanophotonics
- Optical Sensors
- Biosensing
Background:
- Optical Tamm state (OTS) sensors offer strong field confinement and convenient normal-incidence excitation for biosensing.
- Conventional forward design for multilayer OTS devices is inefficient due to extensive parameter scanning in high-dimensional spaces.
Purpose of the Study:
- To present an optimized Optical Tamm state (OTS) refractive-index sensor.
- To utilize a particle swarm optimization (PSO) algorithm for efficient global optimization of geometric parameters.
- To explore the potential of inverse design for OTS sensor development.
Main Methods:
- Fabrication of a BaCO3/TiN/analyte/(SiO2/TiO2) composite structure.
- Global optimization of geometric parameters using a particle swarm optimization (PSO) algorithm.
- Numerical calculations to evaluate sensor performance.
Main Results:
- The optimized OTS sensor achieved a high sensitivity of 590.4 nm/RIU.
- The sensor demonstrated a figure of merit (FOM) of 47.3 RIU⁻¹.
- The proposed structure significantly improves OTS sensing performance.
Conclusions:
- The optimized BaCO3/TiN/analyte/(SiO2/TiO2) structure enhances OTS sensor performance.
- Particle swarm optimization provides an efficient method for designing high-performance OTS sensors.
- The findings show promise for inverse design applications in optical sensing.
