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Atomic Force Microscopy

Atomic Force Microscopy

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The AFM Probe
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Updated: Jun 25, 2025

Implementation of a Reference Interferometer for Nanodetection

Implementation of a Reference Interferometer for Nanodetection

Published on: April 26, 2014

A nanonewton force sensor using a U-shape tapered microfiber interferometer.

Ling Chen^1,2,3, Bin Liu², Christopher Markwell³

¹State Key Laboratory of Information Photonics and Optical Communications, Beijing University of Posts and Telecommunications, Beijing 100876, China.

Science Advances

|May 29, 2024

Summary

This summary is machine-generated.

This study introduces an ultrasensitive all-fiber nanonewton force sensor. This simple, low-cost device achieves a detection limit of ~5.4 nanonewtons, advancing nanomechanical measurements.

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High-Speed Magnetic Tweezers for Nanomechanical Measurements on Force-Sensitive Elements

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Published on: May 12, 2023

Area of Science:

Physics
Materials Science
Engineering

Background:

Nanomechanical measurements are crucial for material science, micromanipulation, and mechanobiology.
Detecting ultraweak forces at the nanonewton level with simple configurations remains a significant challenge.

Purpose of the Study:

To propose and experimentally demonstrate an ultrasensitive all-fiber nanonewton force sensor.
To achieve a low limit of detection for precise force measurements.

Main Methods:

Development of an all-fiber force sensor using a single-mode-tapered U-shape multimode-single-mode fiber probe.
Experimental validation of the sensor's performance, including force measurement on a human hair sample.

Main Results:

The proposed sensor achieved a limit of detection of approximately 5.4 nanonewtons.
The sensor accurately determined the spring constant of a human hair sample, with results comparable to atomic force microscopy (AFM).

Conclusions:

The developed all-fiber sensor offers a significant advancement in minimum detectable force for nanonewton measurements.
The sensor boasts a simple configuration, ease of fabrication, and low cost, making it advantageous over existing optical fiber force sensors.