Gyroidal graphene/porous silicon array for exciting optical Tamm state as optical sensor

Area of Science:

• Photonics
• Materials Science
• Nanotechnology

Background:

• Optical Tamm states are crucial for photonic device applications.
• Graphene and porous silicon offer unique optical and electronic properties.
• Photonic crystal sensors require high sensitivity and figure of merit for accurate detection.

Purpose of the Study:

• To excite optical Tamm states using a novel gyroidal graphene/porous silicon photonic crystal.
• To enhance the sensitivity and figure of merit of Tamm resonance sensors.
• To optimize sensor performance by tuning various physical parameters.

Main Methods:

• Fabrication of a one-dimensional photonic crystal using gyroidal graphene and porous silicon.
• Excitation of optical Tamm states via resonant dips in reflectance spectra.
• Systematic tuning of incidence angle, sample layer thickness, and gyroidal graphene layer thickness.

Main Results:

• Successful excitation of optical Tamm states in the proposed structure.
• Achieved a sensitivity of 188.8 THz/RIU and a figure of merit of 355,384 RIU⁻¹.
• Demonstrated a 38% increase in sensitivity and a 747% increase in figure of merit compared to similar structures.

Conclusions:

• The gyroidal graphene/porous silicon photonic crystal sensor exhibits superior performance.
• The proposed sensor design is highly effective for advanced sensing applications.
• This work paves the way for next-generation photonic sensors with enhanced detection capabilities.