Jove
Visualize
Contact Us
JoVE
x logofacebook logolinkedin logoyoutube logo
ABOUT JoVE
OverviewLeadershipBlogJoVE Help Center
AUTHORS
Publishing ProcessEditorial BoardScope & PoliciesPeer ReviewFAQSubmit
LIBRARIANS
TestimonialsSubscriptionsAccessResourcesLibrary Advisory BoardFAQ
RESEARCH
JoVE JournalMethods CollectionsJoVE Encyclopedia of ExperimentsArchive
EDUCATION
JoVE CoreJoVE BusinessJoVE Science EducationJoVE Lab ManualFaculty Resource CenterFaculty Site
Terms & Conditions of Use
Privacy Policy
Policies

Related Concept Videos

Torque On A Current Loop In A Magnetic Field01:13

Torque On A Current Loop In A Magnetic Field

5.6K
The most common application of magnetic force on current-carrying wires is in electric motors. These consist of loops of wire, which are placed between the magnets with a magnetic field. When current flows through the loops, the magnetic field applies torque, which causes the shaft to rotate, thus converting electrical energy to mechanical energy.
Consider a rectangular current-carrying loop containing N turns of wire, placed in a uniform magnetic field. The net force on a current-carrying loop...
5.6K
Net Torque Calculations01:19

Net Torque Calculations

11.1K
When a mechanic tries to remove a hex nut with a wrench, it is easier if the force is applied at the farthest end of the wrench handle. The lever arm is the distance from the pivot point (the hex nut in this case) to the person’s hand. If this distance is large, the torque is higher. Only the component of the force perpendicular to the lever arm contributes to the torque. Therefore, pushing the wrench perpendicular to the lever arm is more advantageous. If multiple people apply force to...
11.1K
Torque Free Motion01:15

Torque Free Motion

750
The torque-free motion refers to the movement of a rigid body in space when no external torques are acting upon it. This type of motion can be observed in environments where there are no external forces or frictions, like in outer space. For example, a rotation of Mars in space is a torque-free motion. Mars is an axisymmetric object, meaning it has an axis of symmetry along which it rotates, designated as the z-axis. The rotating frame of reference is defined such that the center of mass of...
750

You might also read

Related Articles

Articles linked to this work by shared authors, journal, and citation graph.

Sort by
Same author

A Trajectory-Regularized Physics-Informed Hybrid Framework for Specialty Fresh Food Commodity Price Forecasting and Market Stability Monitoring.

Foods (Basel, Switzerland)·2026
Same author

Soft supermolecule stabilized buried interface for high-performance inverted perovskite solar cells and modules.

Nature communications·2026
Same author

Defect-engineered BiOBr/g-C<sub>3</sub>N<sub>4</sub> heterojunction anchored on Ulva prolifera biochar for enhance photocdatalytic degradation of tetracycline.

Environmental research·2026
Same author

Self-adaptive hetero-phase superlattices in TaS<sub>2</sub> via layer-resolved 1T-to-1H transformations.

National science review·2026
Same author

Fe/Mg-LDH modified biochar for heavy metal soil remediation: Effects on microbial community structure and metabolic activity.

Journal of hazardous materials·2026
Same author

Isotropic zero thermal expansion in sodalite crystals from 11 to 893 K.

Nature chemistry·2026

Related Experiment Video

Updated: Dec 31, 2025

Construction and Operation of a Light-driven Gold Nanorod Rotary Motor System
09:48

Construction and Operation of a Light-driven Gold Nanorod Rotary Motor System

Published on: June 30, 2018

9.2K

Ultrasensitive torque detection with an optically levitated nanorotor.

Jonghoon Ahn1, Zhujing Xu2, Jaehoon Bang1

  • 1School of Electrical and Computer Engineering, Purdue University, West Lafayette, IN, USA.

Nature Nanotechnology
|January 15, 2020
PubMed
Summary

Researchers developed a highly sensitive torque sensor using an optically levitated nanoparticle at room temperature. This breakthrough achieves unprecedented sensitivity for detecting minute forces and opens new avenues in fundamental physics research.

More Related Videos

High-Speed Magnetic Tweezers for Nanomechanical Measurements on Force-Sensitive Elements
08:50

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

Published on: May 12, 2023

2.7K
Label-free Single Molecule Detection Using Microtoroid Optical Resonators
08:53

Label-free Single Molecule Detection Using Microtoroid Optical Resonators

Published on: December 29, 2015

9.6K

Related Experiment Videos

Last Updated: Dec 31, 2025

Construction and Operation of a Light-driven Gold Nanorod Rotary Motor System
09:48

Construction and Operation of a Light-driven Gold Nanorod Rotary Motor System

Published on: June 30, 2018

9.2K
High-Speed Magnetic Tweezers for Nanomechanical Measurements on Force-Sensitive Elements
08:50

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

Published on: May 12, 2023

2.7K
Label-free Single Molecule Detection Using Microtoroid Optical Resonators
08:53

Label-free Single Molecule Detection Using Microtoroid Optical Resonators

Published on: December 29, 2015

9.6K

Area of Science:

  • Physics
  • Nanotechnology
  • Metrology

Background:

  • Torque sensors are crucial for fundamental physics discoveries, including gravity and electromagnetism.
  • Existing high-sensitivity torque sensors often require complex nanofabrication and cryogenic cooling.
  • The quest for enhanced torque detection sensitivity is ongoing for applications in magnetism and quantum phenomena.

Purpose of the Study:

  • To develop a novel torque sensor with significantly improved sensitivity at room temperature.
  • To explore the potential of optically levitated nanoparticles for high-precision torque measurements.
  • To enable the detection of subtle physical effects like vacuum friction.

Main Methods:

  • Utilizing an optically levitated nanoparticle trapped in vacuum as the core sensing element.
  • Achieving ultra-high rotational speeds of the nanoparticle beyond 5 GHz (300 billion rpm).
  • Measuring torque by monitoring changes in the nanorotor's motion.

Main Results:

  • Demonstrated a torque sensor with a sensitivity of (4.2 ± 1.2) × 10⁻²⁷ N m Hz⁻¹/² at room temperature.
  • The developed sensor operates without complex nanofabrication or cryogenic conditions.
  • The system's sensitivity surpasses previous records achieved at millikelvin temperatures.

Conclusions:

  • Optically levitated nanorotors offer a promising platform for ultra-sensitive torque sensing at room temperature.
  • This technology has the potential to enable the detection of elusive phenomena like vacuum friction.
  • Future applications include studies in nanoscale magnetism and quantum geometric phase.