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

Torque01:10

Torque

22.0K
Torque is an important quantity for describing the dynamics of a rotating rigid body. We see the application of torque in many ways in the world, such as when pressing the accelerator in a car, which causes the engine to apply additional torque on the drivetrain. Here, we define torque and provide a framework to create an equation to calculate torque for a rigid body with fixed-axis rotation.
Torque can be considered as the rotational counterpart to force. Since forces change the translational...
22.0K
Torque On A Current Loop In A Magnetic Field01:13

Torque On A Current Loop In A Magnetic Field

5.7K
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...
5.7K
Net Torque Calculations01:19

Net Torque Calculations

11.2K
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...
11.2K
Atomic Force Microscopy01:08

Atomic Force Microscopy

4.4K
Atomic force microscopy (AFM) is a type of scanning probe microscopy that can analyze topographic details of various specimens like ceramics, glass, polymers, and biological samples. AFM offers over 1000 times more resolution than the optical imaging system. Images generated from AFM are three-dimensional surface profiles, offering an advantage over the flat, two-dimensional images from other imaging techniques.
The AFM Probe
The probe is regarded as the heart of any AFM setup and comprises the...
4.4K
IR Spectroscopy: Hooke's Law Approximation of Molecular Vibration01:16

IR Spectroscopy: Hooke's Law Approximation of Molecular Vibration

2.7K
A covalently bonded heteronuclear diatomic molecule can be modeled as two vibrating masses connected by a spring. The vibrational frequency of the bond can be expressed using an equation derived from Hooke's law, which describes how the force applied to stretch or compress a spring is proportional to the displacement of the spring. In this case, the atoms behave like masses, and the bond acts like a spring.
According to Hooke's law, the vibrational frequency is directly proportional to...
2.7K
Standing Waves in a Cavity01:28

Standing Waves in a Cavity

1.4K
A household microwave and lasers are examples of standing electromagnetic waves in a cavity. When two conducting metal plates are placed parallel at the nodal planes, it creates a cavity where standing waves are formed. The cavity between the two planes is analogous to a stretched string held at the points x = 0 and x = L. Here, the distance 'L' between the two planes must be an integer multiple of half of the wavelength. The wavelengths that satisfy this condition are given by:
1.4K

You might also read

Related Articles

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

Sort by
Same author

Thermomechanically squeezed multi-mode phonon lasers with levitated optomechanics.

Nature communications·2026
Same author

Chiral laser gyroscopes breaking the lock-in limit.

Nature·2026
Same author

Corrigendum to "STAT3-driven EMT in cancer metastasis and chemoresistance: A review" [Int. J. Biol. Macromol. 357 (2026): 151403].

International journal of biological macromolecules·2026
Same author

Laser phase plate improves structure determination of small proteins by cryo-EM.

Science (New York, N.Y.)·2026
Same author

Cusp-singularity-enhanced Coriolis effect for sensitive chip-scale gyroscopes.

Nature·2026
Same author

A Meta-Analysis-Based Risk Score for Predicting Radiation Pneumonitis After Thoracic Radiation Therapy for Lung Cancer.

International journal of radiation oncology, biology, physics·2026

Related Experiment Video

Updated: Jan 11, 2026

Spectral and Angle-Resolved Magneto-Optical Characterization of Photonic Nanostructures
08:01

Spectral and Angle-Resolved Magneto-Optical Characterization of Photonic Nanostructures

Published on: November 21, 2019

7.6K

Quantum torque sensing with Kerr cavity optomechanics.

Hang Cheng, Jie Wang, Qian Zhang

    Optics Express
    |November 11, 2025
    PubMed
    Summary

    We theoretically demonstrate a Kerr-enhanced cavity optomechanical (COM) torque sensor that significantly suppresses quantum noise. This novel approach achieves a four-order-of-magnitude enhancement in force sensitivity, surpassing the standard quantum limit (SQL).

    More Related Videos

    Direct Force Measurements of Subcellular Mechanics in Confinement using Optical Tweezers
    09:56

    Direct Force Measurements of Subcellular Mechanics in Confinement using Optical Tweezers

    Published on: August 31, 2021

    5.5K
    Fabrication and Testing of Microfluidic Optomechanical Oscillators
    09:10

    Fabrication and Testing of Microfluidic Optomechanical Oscillators

    Published on: May 29, 2014

    12.6K

    Related Experiment Videos

    Last Updated: Jan 11, 2026

    Spectral and Angle-Resolved Magneto-Optical Characterization of Photonic Nanostructures
    08:01

    Spectral and Angle-Resolved Magneto-Optical Characterization of Photonic Nanostructures

    Published on: November 21, 2019

    7.6K
    Direct Force Measurements of Subcellular Mechanics in Confinement using Optical Tweezers
    09:56

    Direct Force Measurements of Subcellular Mechanics in Confinement using Optical Tweezers

    Published on: August 31, 2021

    5.5K
    Fabrication and Testing of Microfluidic Optomechanical Oscillators
    09:10

    Fabrication and Testing of Microfluidic Optomechanical Oscillators

    Published on: May 29, 2014

    12.6K

    Area of Science:

    • Quantum physics and precision measurement
    • Cavity optomechanics (COM)
    • Nonlinear optics and sensing

    Background:

    • Cavity optomechanical systems are advanced platforms for high-precision quantum measurements.
    • Applications include gravitational wave detection and ultrasensitive mechanical displacement sensing.
    • The potential of Kerr nonlinear media in COM systems for torque sensing is underexplored.

    Purpose of the Study:

    • To theoretically investigate the benefits of incorporating a Kerr nonlinear medium in COM systems for torque sensing.
    • To demonstrate the suppression of quantum noise below the standard quantum limit (SQL) using a Kerr-enhanced COM torque sensor.
    • To identify optimal parameter regimes for minimizing quantum noise through homodyne detection.

    Main Methods:

    • Theoretical analysis of a Kerr-enhanced cavity optomechanical system.
    • Optimization of homodyne detection techniques for noise reduction.
    • Modeling under experimentally feasible parameters.

    Main Results:

    • A Kerr-enhanced COM torque sensor can suppress quantum noise below the standard quantum limit (SQL).
    • Optimal parameter regimes for noise minimization were identified.
    • A four-orders-of-magnitude enhancement in force sensitivity was theoretically achieved compared to non-Kerr systems.

    Conclusions:

    • The proposed Kerr-enhanced COM torque sensor offers unprecedented force sensitivity.
    • The scheme is compatible with current COM engineering, enabling practical applications.
    • Potential applications include dark-matter searches and Casimir-torque measurements.