High-performance sensor achieved by hybrid guide-mode resonance/surface plasmon resonance platform

Area of Science:

• Nanophotonics
• Plasmonics
• Metamaterials

Background:

• Surface plasmon resonance (SPR) and guide-mode resonance (GMR) are key optical phenomena in nanostructures.
• Metal-dielectric-metal-dielectric (MDMD) nanostructures offer tunable optical properties.
• Understanding resonance hybridization is crucial for advanced optical applications.

Purpose of the Study:

• To comprehensively analyze the multiband absorption properties of an MDMD nanostructure.
• To investigate the hybridization of SPR and GMR in the nanostructure.
• To evaluate the potential of the MDMD nanostructure for ultrasensitive biochemical sensing.

Main Methods:

• Simulated optical properties of an MDMD nanostructure under TM wave illumination.
• Utilized dispersion relation equations to identify hybrid GMR/SPR.
• Calculated sensitivity and figure of merit (FoM) for sensing applications.

Main Results:

• Observed multiband absorption attributed to hybrid GMR/SPR.
• Demonstrated high sensitivity of the nanostructure to dielectric environment changes.
• Achieved a maximum sensitivity of 1087 nm/RIU with FoM of 23 and FoM* of 483.

Conclusions:

• The MDMD nanostructure exhibits promising multiband absorption characteristics.
• The hybrid GMR/SPR mechanism enables efficient light-matter interaction.
• The nanostructure is a strong candidate for ultrasensitive biochemical sensing due to its high sensitivity and field enhancement.