Theoretical study on photonic devices based on a commensurate two-pattern photonic crystal

Area of Science:

• Photonics
• Optical Engineering
• Materials Science

Background:

• Optical chips require control of transverse electric (TE) and transverse magnetic (TM) polarized light.
• Integrating devices for different polarizations on a single plane is challenging at the wavelength scale.

Purpose of the Study:

• To demonstrate a novel photonic crystal structure for simultaneous control of TE and TM polarized light.
• To enable the integration of multiple polarization-dependent photonic devices on a single plane.

Main Methods:

• Design and simulation of a periodic two-pattern photonic crystal.
• Utilizing the superposition of two substructures, each contributing a complete photonic bandgap (PBG) for a specific polarization (TE or TM).
• Introducing defects into the photonic crystal substructures to create functional photonic devices.

Main Results:

• Achieved a large, complete photonic bandgap (PBG) by superposing TE and TM PBG substructures.
• Demonstrated the ability to integrate devices for bending, splitting, and resonating both TE and TM waves on the same plane.
• Successfully controlled different polarizations simultaneously within the designed photonic crystal.

Conclusions:

• The demonstrated periodic two-pattern photonic crystal enables simultaneous manipulation of TE and TM polarized light.
• This approach facilitates the integration of diverse photonic devices for multi-polarization control on a single optical chip plane.
• Offers a promising platform for advanced integrated photonic applications requiring polarization management.