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‘Hi-Fi AFM’: high-speed contact mode atomic force microscopy with optical pickups

Russell-Pavier, F S; Picco, L; Day, J C C; Shatil, N R; Yacoot, A; Payton, O D (2018) ‘Hi-Fi AFM’: high-speed contact mode atomic force microscopy with optical pickups. Measurement Science and Technology, 29 (10). 105902 ISSN 0957-0233

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Abstract

High-speed atomic force microscopy (HS-AFM) is a powerful emerging tool used to gain insight into real-time nanoscale dynamics and phenomena across the sciences. By performing measurements of material properties, abundancy counting and dimensional analysis, it enables a new generation of discoveries at the atomic scale. Here, we demonstrate the use of an optical pickup unit (OPU) typically found in PCs, Hi-Fis and games consoles worldwide, as a vertical detection system within in a HS-AFM operated in contact mode. A demonstration of the OPU displacement performance is compared to that of a commercially available laser Doppler vibrometer with ±15 pm resolution. Sub-nanometre sensitivity is achieved with an OPU, presented via the identification of two resonant modes of a cantilever stimulated by ambient thermal excitation. To demonstrate the large dynamic range of the sensor at fast scan-speeds, surface profiles with step heights in excess of 100 nm and surface textures less than 10 nm were collected using a custom OPU based HS-AFM. The high fidelity measurements are extended to visible length scales in short timescales by imaging areas of up to 200 µm2 area at a pixel rate of 2 megapixels/s, tip velocity of 10 mm/s and area rate of 25 µm2/s.

Item Type: Article
Subjects: Engineering Measurements > Dimensional
Divisions: Engineering, Materials & Electrical Science
Identification number/DOI: 10.1088/1361-6501/aad771
Last Modified: 30 Oct 2018 15:08
URI: http://eprintspublications.npl.co.uk/id/eprint/8123

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