Innovative fiber Bragg grating filter based on a graphene photonic crystal microcavity

Area of Science:

• Photonics
• Optical Engineering
• Materials Science

Background:

• Fiber Bragg Gratings (FBGs) are crucial optical components.
• Photonic crystal (PC) microcavities offer unique optical properties.
• Graphene's unique electronic and optical characteristics are of great interest.

Purpose of the Study:

• To propose and theoretically analyze a new FBG filter model.
• To investigate the use of a graphene-defect in a PC microcavity for FBG filtering.
• To explore the tunability and amplification capabilities of the proposed device.

Main Methods:

• Modeling a 1D defective photonic bandgap structure.
• Utilizing a SiO2/TiO2 asymmetric PC microcavity with a graphene defect.
• Combining the density matrix approach and transfer matrix method for theoretical analysis.
• Calculating transmittance spectra considering incident angle and polarization.

Main Results:

• The FBG filter operates within telecom windows, centered around 1550 nm.
• Tuning of filtering wavelength and guided modes is achievable by altering the defect layer.
• Probe field absorption can be minimized or amplified based on coupling field intensity.
• The device shows tunable transmittance spectra sensitive to incident angle and polarization.

Conclusions:

• The proposed graphene-defect FBG filter demonstrates promising performance for near-infrared applications.
• The theoretical model provides a foundation for fabricating advanced optical filters.
• The tunability and amplification capabilities highlight the potential for novel light wave communication devices.