Calibration Spheres

The three general types of calibration include factory calibration performed by the instrument manufacturer, routine user verification performed before measurements, and traceable calibration conducted using certified reference standards. In nanoscale microscopy, calibration encompasses lateral axis verification, vertical step-height validation, and functional electrical or capacitance calibration to ensure consistent instrument performance and measurement accuracy across experimental workflows.

Atomic force microscopy utilizes periodic grating standards, step-height calibration standards, thin-film substrates, and dopant standards. Periodic gratings verify lateral scanner linearity, step-height structures validate vertical Z-axis accuracy, and thin-film gold on mica substrates assist in surface roughness characterization. Specialized standards, such as dopant or capacitance samples, support advanced electrical modes like scanning capacitance microscopy and scanning microwave microscopy.

Periodic grating samples feature defined repetitive structures, such as 500 nm pitch profiles, designed to test lateral scanner response and linearity. By imaging the known grating period, operators can detect lateral distortion, calibrate XY magnification, and verify measurement accuracy. Routine evaluation with periodic gratings ensures atomic force microscopes maintain consistent dimensional precision and reliable instrument performance across research applications.

Step-height calibration standards feature precisely defined vertical steps to calibrate and verify the Z-axis of scanning probe microscopes. Piezoelectric scanners can exhibit non-linear vertical behavior over time, making vertical calibration essential for accurate topographic height measurements. Regular verification with step-height standards ensures repeatable depth profiling, reliable nanometrology research, and consistent quality control across materials characterization studies.

Semiconductor dopant profiling relies on specialized calibration standards, including p-type and n-type dopant reference samples with known dopant concentrations. These standards calibrate scanning capacitance microscopy and scanning microwave microscopy instruments by providing repeatable nanoscale reference responses. Utilizing dedicated dopant standards enables reproducible electrical characterization, accurate carrier profiling, and dependable device analysis in semiconductor research laboratories.

Gold thin film deposited on mica substrates provides a well-characterized conductive surface for atomic force microscopy calibration and surface roughness evaluation. Available in small and large formats, these substrates serve as consistent reference baselines for nanoscale imaging, thin-film characterization, and material analysis. They allow researchers to assess tip quality, confirm imaging stability, and benchmark surface measurements.