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A high speed X-Y nanopositioner with integrated optical motion sensing.

Priyanka Gupta1, P Piyush1, R Sriramshankar1

  • 1Department of Instrumentation and Applied Physics, Indian Institute of Science, Bangalore 560012, India.

The Review of Scientific Instruments
|April 1, 2019
PubMed
Summary

This study presents a novel nanopositioner for scanning probe microscopy, featuring integrated optical sensing for high-speed X-Y motion. This design enhances tracking accuracy for fast imaging and manipulation tasks.

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Area of Science:

  • Nanotechnology
  • Microscopy
  • Mechanical Engineering

Background:

  • High-speed in-plane (X-Y) nanopositioners are crucial for advanced scanning probe microscopy.
  • Miniaturizing nanopositioning stages improves speed but complicates sensor integration.
  • Conventional motion sensors face spatial constraints in small-scale stages.

Purpose of the Study:

  • To design and develop a novel, high-speed, flexure-guided, piezo-electrically actuated nanopositioner.
  • To integrate an optical beam deflection-based motion sensing strategy for improved spatial flexibility.
  • To enhance tracking accuracy in scanning probe microscopy applications.

Main Methods:

  • Development of a flexure-guided, piezo-electrically actuated nanopositioner.
  • Integration of an optical beam deflection-based motion sensing system.
  • Utilizing a lumped-parameter model for nanopositioner design and fabrication.
  • Characterization of quasi-static and dynamic response.
  • Implementation of closed-loop control using in-plane motion measurements.

Main Results:

  • Successful design and fabrication of a compact nanopositioner with integrated optical sensing.
  • Demonstration of the sensing strategy's effectiveness in overcoming spatial constraints.
  • Accurate characterization of the stage's static and dynamic performance.
  • Significant improvement in tracking accuracy for both slow and fast position signals through closed-loop control.

Conclusions:

  • The novel nanopositioner with integrated optical sensing meets the demands for high-speed imaging and manipulation.
  • The optical sensing approach effectively addresses integration challenges in miniaturized stages.
  • Closed-loop control significantly enhances the performance of nanopositioners in demanding applications.