TY - GEN
T1 - A New Dynamic Imaging Mode for High-Resolution and High-Bandwidth Atomic Force Microscopy
AU - Gorugantu, Ram Sai
AU - Salapaka, Srinivasa M.
N1 - ACKNOWLEDGMENT The authors would like to acknowledge NSF grant-CMMI 14-63239 for supporting this work.
*This work was supported by NSF CMMI grant 14-63239 1Ram Sai Gorugantu is a graduate student at the Department of Mechanical Science and Engineering, University of Illinois at Urbana-Champaign [email protected] 2Srinivasa M. Salapaka is a Professor at the Department of Mechanical Science and Engineering, University of Illinois at Urbana-Champaign [email protected]
PY - 2018/8/9
Y1 - 2018/8/9
N2 - Ahstract- This paper proposes a new high-bandwidth mode of imaging in an Atomic Force Microscope (AFM). This is achieved by regulating the gap between the sample and the vibrating cantilever tip to an appropriate sinusoidal signal with frequency close to the cantilever resonant frequency. This scheme utilizes the deflection signal of the cantilever instead of its derivatives such as amplitude and phase. We design the regulating controller using ∞mixed synthesis. Another major advantage of this approach is that we exploit a structure where sample topography estimation can be accurately done even at frequencies beyond the bandwidth of disturbance rejection resulting from the ∞ optimal controller. Simulation results show an order of magnitude improvement in bandwidth over conventional tapping mode imaging. Experimental implementation of this new imaging mode is ongoing.
AB - Ahstract- This paper proposes a new high-bandwidth mode of imaging in an Atomic Force Microscope (AFM). This is achieved by regulating the gap between the sample and the vibrating cantilever tip to an appropriate sinusoidal signal with frequency close to the cantilever resonant frequency. This scheme utilizes the deflection signal of the cantilever instead of its derivatives such as amplitude and phase. We design the regulating controller using ∞mixed synthesis. Another major advantage of this approach is that we exploit a structure where sample topography estimation can be accurately done even at frequencies beyond the bandwidth of disturbance rejection resulting from the ∞ optimal controller. Simulation results show an order of magnitude improvement in bandwidth over conventional tapping mode imaging. Experimental implementation of this new imaging mode is ongoing.
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U2 - 10.23919/ACC.2018.8431693
DO - 10.23919/ACC.2018.8431693
M3 - Conference contribution
AN - SCOPUS:85052608169
SN - 9781538654286
T3 - Proceedings of the American Control Conference
SP - 6018
EP - 6023
BT - 2018 Annual American Control Conference, ACC 2018
PB - Institute of Electrical and Electronics Engineers Inc.
T2 - 2018 Annual American Control Conference, ACC 2018
Y2 - 27 June 2018 through 29 June 2018
ER -