The 4D Camera: An 87 kHz Direct Electron Detector for Scanning/Transmission Electron Microscopy

Area of Science:

• Electron Microscopy
• Materials Science
• Physics

Background:

• High-speed data acquisition is crucial for advanced electron microscopy.
• Current detectors face limitations in speed and data handling for complex experiments.

Purpose of the Study:

• To introduce the 4D Camera, a novel active pixel sensor for scanning/transmission electron microscopy.
• To demonstrate its capabilities in high-speed data acquisition and processing.

Main Methods:

• Development of a 576x576 pixel back-illuminated active pixel sensor operating at 87,000 Hz.
• Implementation of a parallelized software infrastructure for processing large raw datasets (10-700 GB).
• Utilizing electron counting and sparsity-based algorithms for data reduction (10-300x).

Main Results:

• The 4D Camera achieves a frame rate of 87,000 Hz, generating data at ~480 Gbit/s.
• Single electron events are detectable across a wide voltage range (30-300 kV).
• Sparsity-based processing enables rapid analysis of reduced datasets.

Conclusions:

• The 4D Camera significantly enhances scanning transmission electron microscopy capabilities.
• Its high speed and efficient data handling facilitate large and complex diffraction experiments.
• Open-source algorithms promote accessibility and further development in the field.