3D visualization of microwave electric and magnetic fields by using a metasurface-based indicator

Area of Science:

• Physics
• Materials Science
• Electrical Engineering

Background:

• Understanding microwave near-field distributions is crucial for radio-frequency (RF) filter design and performance.
• Existing visualization techniques may lack the resolution or specificity for detailed electric and magnetic field mapping.

Purpose of the Study:

• To visualize microwave electric and magnetic near-field distributions of RF filters.
• To develop novel optical indicators for selective visualization of electric field components.
• To validate the performance of these indicators through numerical simulations and experimental comparison.

Main Methods:

• Thermoelastic optical indicator microscopy (TEOIM) was employed for near-field visualization.
• New optical indicators based on periodic dielectric-metal structures (metasurfaces) were designed.
• Numerical simulations were performed to analyze indicator working principles and validate experimental results.

Main Results:

• Metasurface-based indicators allowed separate visualization of E_x and E_y components of the in-plane electric field based on structure orientation.
• Experimental results showed good agreement with numerical simulations, confirming the indicator's effectiveness.
• 3D visualization of microwave near-field distribution was achieved, demonstrating field intensity and distance dependencies.

Conclusions:

• TEOIM with novel metasurface indicators provides a powerful method for visualizing microwave near-field distributions.
• The developed indicators enable detailed analysis of electric field components, aiding RF filter optimization.
• This technique offers a pathway for enhanced understanding and design of RF components.