A photo-controlled, all-solid, and frequency-tunable ultra-wideband pulse generator

Area of Science:

• Physics
• Electrical Engineering
• Biomedical Engineering

Background:

• Bioelectric effects are crucial in cancer therapy and drug delivery, with pulsed electric fields showing significant promise.
• Nanosecond and picosecond pulsed electric fields are key modalities currently under investigation for these applications.

Purpose of the Study:

• To propose and experimentally validate an ultrashort pulsed electric field generator.
• To demonstrate the generation of frequency-adjustable unipolar and bipolar pulses for advanced therapeutic applications.

Main Methods:

• The generator utilizes two parallel photoconductive semiconductor switches triggered by a 532 nm laser (1 ns and 500 ps pulse widths).
• Radio frequency combiner simulations were performed to optimize the pulse generation.
• Experimental validation focused on achieving adjustable center frequency and 3 dB bandwidth.

Main Results:

• The proposed scheme successfully generated unipolar and bipolar pulses.
• Adjustments in center frequency (357 MHz) and 3 dB bandwidth (720 MHz) were experimentally achieved.
• The system demonstrated frequency-tunable ultra-wideband pulse generation capabilities.

Conclusions:

• The developed ultrashort pulsed electric field generator is effective for producing frequency-adjustable unipolar/bipolar pulses.
• This technology holds potential for enhancing cancer therapy and drug introduction through precise bioelectric field manipulation.