Developing an Optical Microlever for Stable and Unsupported Force Amplification

Conference paper (2022)

Authors

Philippa Kate Andrew Massey University

Allan Raudsepp Massey University

Volker Nock University of Canterbury, MacDiarmid Institute for Advanced Materials and Nanotechnology

D. Fan Team Carlas Smith - Mechanical, Maritime and Materials Engineering

Martin A.K. Williams MacDiarmid Institute for Advanced Materials and Nanotechnology, Massey University

U. Staufer Micro and Nano Engineering - Mechanical, Maritime and Materials Engineering

Ebubekir Avci MacDiarmid Institute for Advanced Materials and Nanotechnology, Massey University

Research Group

Team Carlas Smith (Mechanical, Maritime and Materials Engineering) (TU Delft)

DOI: https://doi.org/10.1109/MARSS55884.2022.9870464

Stability analysis Force measurement Force Optical imaging Systematics Stimulated emission Optical design

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Published Date

2022

Language

English

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Faculty

Mechanical, Maritime and Materials Engineering

Department

Delft Center for Systems and Control

Research Group

Team Carlas Smith

Abstract

Optical micromachines have the potential to improve the capabilities of optical tweezers by amplifying forces and allowing for indirect handling and probing of specimens. However, systematic design and testing of micromachine performance is still an emerging field. In this work we have designed and tested an unsupported microlever, suitable for general-purpose optical tweezer studies, that demonstrates stable trapping performance and repeatable doubling of applied forces. Stable trapping was ensured by analysing images to monitor focus shift when levers oscillated repeatedly, before the best-performing design was selected for force amplification. This study also shows that direct measurement of trap stiffness using the equipartition theorem appears to be a valid method for measuring applied forces on the spherical handles of microlevers.

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