Femtosecond electron beam probe of ultrafast electronics

Area of Science:

• Physics
• Materials Science
• Electrical Engineering

Background:

• The demand for faster information processing necessitates smaller electronic devices operating at terahertz (THz) and petahertz (PHz) frequencies.
• Existing diagnostic tools lack the spatiotemporal resolution required for these advanced devices.

Purpose of the Study:

• To introduce an ultrafast electron beam probe capable of diagnosing high-frequency electronic devices.
• To demonstrate a method for directly sensing local electromagnetic fields with high resolution.

Main Methods:

• Utilized terahertz-compressed electron pulses in an electron beam probe.
• Analyzed the dynamical response of a coplanar waveguide circuit.
• Measured electromagnetic fields with femtosecond temporal resolution and micrometre spatial resolution.

Main Results:

• Achieved a measurement bandwidth of 10 THz.
• Demonstrated sensitivity to electric potentials in the tens of millivolts (-20 dBm).
• Directly revealed impulse response, signal reflections, attenuation, and waveguide dispersion in the time domain.

Conclusions:

• The femtosecond electron beam probe provides unprecedented speed and spatial resolution for electronic device diagnostics.
• This technique is integrable into existing semiconductor industry inspection devices.
• It is a promising tool for research and development of next-generation electronics.