Neutral Atom Imaging System for Sub-5nm Defect Inspection
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Solution Overview
Problem
Current optical and electron beam inspection techniques suffer from limited spatial resolution and low signal-to-noise ratios, especially when analyzing defects smaller than five nanometers, and are often slow due to charging effects.
Innovation Solution
A neutral atom imaging system utilizing a neutral atom source, ionizer, selector, ion optics, and detector to generate high-resolution images of samples by filtering and focusing ionized atoms scattered from the sample surface, providing improved spatial resolution and sensitivity to surface structures while maintaining high inspection speed.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If optical sample inspection techniques are used, then inspection speed is improved, but spatial resolution deteriorates
Solution Approach 1:
The patent changes the fundamental parameter of the inspection beam from photons (optical) to neutral atoms (matter waves). This parameter change enables simultaneous achievement of high inspection speed (inherently fast atomic beam propagation) and high spatial resolution (de Broglie wavelength of neutral atoms is much shorter than optical wavelengths, enabling sub-5nm resolution).
2Productivity
If optical inspection techniques are used, then inspection speed is improved, but signal to noise ratio deteriorates
Solution Approach 1:
The patent changes the inspection probe from electromagnetic radiation to neutral matter waves. Neutral atoms interact with sample surfaces through direct physical interaction and scattering, producing strong signals even for sub-5nm defects. The subsequent ionization and detection of scattered atoms provides high signal-to-noise ratio while maintaining fast inspection speeds.
3Measurement precision
If electron beam scanning inspection is used, then spatial resolution is improved, but inspection speed deteriorates
Solution Approach 1:
The patent replaces the mechanical scanning system of electron beams with a stationary neutral atom beam. Instead of scanning the beam across the sample, the neutral atom beam is directed at the sample and scattered atoms are detected. This eliminates charging effects that limit electron beam resolution and enables faster inspection without sacrificing spatial resolution.
4Measurement precision
If electron beam scanning inspection is used, then spatial resolution is improved, but charging effects worsen
Solution Approach 1:
The patent substitutes charged electron beams with neutral atom beams for sample inspection. Neutral atoms do not cause charging effects on the sample surface, eliminating this harmful factor entirely. The neutral atoms maintain high spatial resolution through their short de Broglie wavelengths while avoiding all charging-related artifacts that plague electron beam techniques.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The system achieves enhanced spatial resolution and sensitivity to surface morphology with minimal surface alteration, outperforming previous methods in terms of inspection speed and accuracy for small defects.
Implementation Method 1
a neutral atom source configured to generate a beam of neutral atoms and direct the beam to a sample
Implementation Method 2
an ionizer configured to collect neutral atoms scattered from the surface of the sample and to ionize the collected neutral atoms to generate ionized atoms
Implementation Method 3
a selector configured to receive the ionized atoms from the ionizer and to selectively filter the ionized atoms
Implementation Method 4
the one or more ion optics are configured to receive selected ionized atoms from the selector and focus the selected ionized atoms onto the detector
Implementation Method 5
the detector is configured to generate one or more images of the sample based on the received selected ionized atoms
Implementation Method 6
collect neutral atoms scattered from the surface of the sample
Data Source
AI summary
An imaging system utilizing atomic atoms is provided. The system may include a neutral atom source configured to generate a beam of neutral atoms. The system may also include an ionizer configured to collect neutral atoms scattered from the surface of a sample. The ionizer may also be configured to ionize the collected neutral atoms. The system may also include a selector configured to receive ions from the ionizer and selectively filter received ions. The system may also include one or more optical elements configured to direct selected ions to a detector. The detector may be configured to generate one or more images of the surface of the sample based on the received ions.