Switchable and Tunable Terahertz Metamaterial Based on Vanadium Dioxide and Photosensitive Silicon

Area of Science:

• Metamaterials
• Terahertz (THz) Technology
• Optoelectronics

Background:

• Metamaterials offer unique electromagnetic properties.
• Terahertz technology requires advanced materials for tunable devices.
• Vanadium dioxide (VO2) exhibits temperature-dependent phase transitions.

Purpose of the Study:

• To propose and theoretically investigate a switchable and tunable THz metamaterial.
• To explore the control of electromagnetic properties using photosensitive silicon and VO2.
• To demonstrate dual electromagnetically induced transparency (EIT) or narrow-band absorption functionalities.

Main Methods:

• Utilizing the finite-difference time-domain (FDTD) method for theoretical analysis.
• Investigating transmission and reflective properties of the proposed metamaterial.
• Simulating the effects of temperature on VO2 and light on photosensitive silicon.

Main Results:

• The metamaterial exhibits switchable dual EIT or two narrow-band absorptions based on VO2 temperature.
• The magnitude of EIT and absorption is tunable by adjusting photosensitive silicon conductivity via pumping light.
• The accompanying slow-light effect is also adjustable.

Conclusions:

• The proposed metamaterial demonstrates effective switching and tuning capabilities in the THz regime.
• This design offers potential for advanced THz devices like modulators and filters.
• The combination of photosensitive silicon and VO2 provides a versatile platform for THz applications.