Theoretical analysis and applications on nano-block loaded rectangular ring.

Area of Science:

• Photonics and Nanotechnology
• Optical Engineering
• Plasmonics

Background:

• Optical filters are crucial components in various photonic applications.
• Existing filters often face limitations in size, tunability, and performance.
• Rectangular ring resonators are a known platform for optical filtering.

Purpose of the Study:

• To propose and investigate novel compact and switchable optical filters.
• To explore the design principles of nano-block loaded rectangular rings for optical filtering.
• To demonstrate tunable plasmon-induced transparency (PIT) switching effects.

Main Methods:

• Numerical simulations and theoretical analysis were employed.
• A phase model was established for theoretical investigation.
• The influence of nano-block parameters (number, size, position) was systematically studied.

Main Results:

• Achieved longer wavelength filtering without increasing device dimensions.
• Demonstrated enhanced sensitivity of selected wavelengths to block length.
• Identified critical roles of loading positions for mode separation.
• Realized a tunable PIT-based switching effect.

Conclusions:

• Nano-block loaded rectangular rings offer a pathway to highly compact optical filters.
• The proposed structure enables tunable optical switching and filtering functionalities.
• Potential applications include compact filters, tunable slow light devices, and sensors.