Enhanced THz Smith-Purcell radiation based on the grating grooves with holes array

Area of Science:

• Physics
• Electromagnetism
• Terahertz (THz) Science and Technology

Background:

• Smith-Purcell radiation is generated when electrons interact with metallic gratings.
• The radiation mechanism is traditionally explained by a one-dimensional oscillating dipole formed by a charge and its image.
• Existing methods for enhancing THz Smith-Purcell radiation have limitations.

Purpose of the Study:

• To present an alternative method for enhancing terahertz (THz) Smith-Purcell radiation.
• To investigate the effect of modifying grating structures on radiation output.
• To improve the efficiency of devices utilizing Smith-Purcell radiation.

Main Methods:

• A novel grating design featuring holes drilled into the fins was proposed.
• These holes act as an effective electron channel, enabling two-dimensional dipole oscillation.
• The radiation power was compared to conventional gratings where electrons pass close to the surface.

Main Results:

• The modified grating design resulted in a two-dimensional oscillating dipole.
• A tenfold increase in Smith-Purcell radiation power was observed compared to the conventional method.
• The enhanced radiation power demonstrates the effectiveness of the proposed structural modification.

Conclusions:

• Drilling holes in grating fins is a viable strategy to significantly enhance THz Smith-Purcell radiation.
• The two-dimensional oscillating dipole mechanism is key to the observed power increase.
• This technique holds promise for improving the performance of THz radiation-based devices.