Control-observer technique for surface imaging with an experimental platform of Scanning-Tunneling-Microscope type

Andrei Popescu (1, 2) , Gildas Besancon (1) , Alina Voda (3) , Skandar Basrour (2)

1 GIPSA-SYSCO - GIPSA - Systèmes non linéaires et complexité
2 TIMA - Techniques de l'Informatique et de la Microélectronique pour l'Architecture des systèmes intégrés
3 GIPSA-SLR - GIPSA - Systèmes linéaires et robustesse

This paper proposes a control strategy based on synthesis of robust design techniques with state observer tools, handling nonlinearities in the driving piezoactuators, as well as in the tunneling current for a home-made Scanning-Tunneling- Microscope-like device (STM), allowing to estimate the surface of nano samples. As in standard STM operation, a tip is driven at a fixed (subnanometric) distance above the sample which isscanned. The control approach is illustrated with an example of experimental surface reconstruction, and a comparison with results provided by a commercial STM.

Domaines: Sciences de l'ingénieur [physics]; Automatique / Robotique; Micro et nanotechnologies/Microélectronique

Andrei Popescu, Gildas Besancon, Alina Voda, Skandar Basrour. Control-observer technique for surface imaging with an experimental platform of Scanning-Tunneling-Microscope type. ACC 2018 - American Control Conference, Jun 2018, Milwaukee, United States. ⟨10.23919/ACC.2018.8430882⟩. ⟨hal-01833278⟩