Narrow-band transmission filter based on 1D-PCs with a defect layer

Area of Science:

• Materials Science
• Optoelectronics
• Nanotechnology

Background:

• One-dimensional photonic crystals offer tunable optical properties.
• Sol-gel spin-coating is a versatile method for fabricating thin-film devices.
• Tailoring layer thickness is crucial for controlling optical filter performance.

Purpose of the Study:

• To develop a narrow-band transmission filter using SiO2/TiO2 one-dimensional photonic crystals.
• To investigate the effect of defect layers on filter characteristics.
• To optimize filter performance by controlling layer thickness and defect material.

Main Methods:

• Fabrication of SiO2/TiO2 photonic crystal filters using sol-gel spin-coating.
• Characterization of structural and optical properties using atomic force microscopy, scanning electron microscopy, and UV-visible spectroscopy.
• Engineering of layer thickness and defect layer material to tune transmission and bandgap.

Main Results:

• Achieved narrow-band transmission filters with tunable characteristics.
• Demonstrated maximum transmission of 58.09% for TiO2 defect layers and 42.21% for InP defect layers.
• Showcased layer thickness control via spin-coater rotational speed.

Conclusions:

• Sol-gel spin-coating is effective for fabricating tunable photonic crystal filters.
• Defect layer engineering significantly impacts optical filter performance.
• The developed filters show potential for various optical applications.