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Compact ultra-fast vertical nanopositioner for improving scanning probe microscope scan speed.

Brian J Kenton¹, Andrew J Fleming, Kam K Leang

¹Department of Mechanical Engineering, University of Nevada Reno, Reno, Nevada 89557-0312, USA.

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Summary

A new vertical positioning stage enhances scanning probe microscope (SPM) performance by over 25 times. This high-bandwidth stage utilizes a novel flexure design and inertial cancellation for improved stability and speed.

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Area of Science:

Mechanical Engineering
Nanotechnology
Instrumentation

Background:

Scanning Probe Microscopes (SPMs) require precise vertical positioning for high-resolution imaging.
Existing vertical stages can suffer from mechanical resonances limiting feedback control loop performance.
Integration of advanced actuation systems is crucial for improving SPM scanning capabilities.

Purpose of the Study:

To design and evaluate a high-bandwidth, short-range vertical positioning stage for SPM integration.
To improve scanning performance through dual-stage actuation.
To minimize mechanical resonances and enhance feedback control.

Main Methods:

Mechanical design incorporating a piezo-stack actuator and a novel circular flexure.
Finite element analysis (FEA) for performance evaluation.
Inertial cancellation scheme for reduced reliance on rigid mounting.
Experimental evaluation with a commercial SPM.

Main Results:

The prototype stage exhibits a dominant unloaded mechanical resonance above 150 kHz.
Achieved a vertical travel range of approximately 1.56 μm.
Demonstrated over a 25-fold improvement in scanning performance when integrated with an SPM.

Conclusions:

The developed high-bandwidth vertical positioning stage significantly enhances SPM scanning performance.
The novel flexure design and inertial cancellation effectively address limitations of conventional stages.
This technology offers a pathway to more stable and faster nanoscale imaging and manipulation.