Leaky and waveguide modes in biperiodic holograms.

Area of Science:

• Photonics and Nanophotonics
• Biosensing Technologies
• Optical Metamaterials

Background:

• All-dielectric holograms offer unique optical properties for advanced applications.
• Leaky and waveguide modes are crucial for manipulating light confinement.
• Refractive index sensing requires high sensitivity and specificity.

Purpose of the Study:

• To theoretically analyze leaky and waveguide modes in biperiodic all-dielectric holograms.
• To develop a new class of highly sensitive refractive index biosensing platforms.
• To demonstrate the capability of resolving spectral shifts for multiple biological analytes.

Main Methods:

• Theoretical analysis of leaky and waveguide modes.
• Tuning of diffraction orders in biperiodic structures.
• Confinement of local density of optical states at specific resonance wavelengths.

Main Results:

• Identification of two distinct resonance wavelengths for optical state confinement.
• Demonstration of a new class of biosensing platforms.
• Achieved spectral shift resolution of 35.5 to 41.3 nm/RIU for two analytes.

Conclusions:

• Biperiodic all-dielectric holograms enable highly sensitive refractive index biosensing.
• The proposed method allows for simultaneous detection of multiple analytes.
• This platform holds significant potential for future biosensing applications.