Jove
Visualize
Contact Us

Related Concept Videos

Positive and Negative Feedback Loops01:18

Positive and Negative Feedback Loops

24.9K
Animal organs and organ systems constantly adjust to internal and external changes through a process called homeostasis ("steady state"). Examples of these changes include regulation of the level of glucose or calcium in the blood or internal responses to external temperatures. Homeostasis requires  maintaining an internal dynamic equilibrium:
24.9K
Simulation, Fabrication and Characterization of THz Metamaterial Absorbers13:44

Simulation, Fabrication and Characterization of THz Metamaterial Absorbers

15.9K
This protocol outlines the simulation, fabrication and characterization of THz metamaterial absorbers. Such absorbers, when coupled with an appropriate sensor, have applications in THz imaging and...
15.9K
Fabricating Metamaterials Using the Fiber Drawing Method11:57

Fabricating Metamaterials Using the Fiber Drawing Method

14.3K
Metamaterials at terahertz frequencies offer unique opportunities, but are challenging to fabricate in bulk. We adapt the fabrication procedure for microstructured polymer optical fibers to inexpensively fabricate metamaterials potentially on an industrial scale. We produce polymethylmethacrylate fibers containing ~10 μm diameter indium wires separated by ~100 μm, which exhibit a terahertz plasmonic...
14.3K
Characterizing Dissipative Elastic Metamaterials Produced by Additive Manufacturing09:39

Characterizing Dissipative Elastic Metamaterials Produced by Additive Manufacturing

1.5K
Additively manufactured polymers have been widely used for producing elastic metamaterials. The viscoelastic behavior of these polymers at ultrasonic frequencies remains, however, poorly studied. This study reports a protocol to estimate the viscoelastic properties of 3D-printed polymers and show how to use them to analyze the metamaterial dynamics.
1.5K
A Lightweight, Headphones-based System for Manipulating Auditory Feedback in Songbirds10:13

A Lightweight, Headphones-based System for Manipulating Auditory Feedback in Songbirds

14.7K
We describe the design and assembly of miniaturized headphones suitable for replacing a songbird’s natural auditory feedback with a manipulated acoustic signal. Online sound processing hardware is used to manipulate song output, introduce real-time errors in auditory feedback via the headphones, and drive vocal motor...
14.7K
Feedback Inhibition00:46

Feedback Inhibition

56.9K
Biochemical reactions are occurring constantly in cells, converting starting substances to different products, usually with the help of enzymes that speed the reactions. Without enzymes, it would take far too long for most reactions to occur to be useful to the cell!
56.9K

You might also read

Related Articles

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

Sort by
Same author

Supersymmetric Isophase Acoustic Potentials.

Physical review letters·2026
Same author

Monolithic photonic architecture for volumetric illumination in plasmonic photocatalysis.

Nanoscale·2026
Same author

Vortex beam nanofocusing and optical skyrmion generation via hyperbolic metamaterials.

Nanophotonics (Berlin, Germany)·2025
Same author

Structuring polarization states of light in space and time.

Nanophotonics (Berlin, Germany)·2025
Same author

Intermodal all-optical pulse switching and frequency conversion using temporal reflection and refraction in multimode fibers.

Nanophotonics (Berlin, Germany)·2025
Same author

Von Willebrand Factor Multimers in Aortic Stenosis Surgery: Dynamics and Disease Correlation.

Journal of atherosclerosis and thrombosis·2025
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 Experiment Video

Updated: Jan 19, 2026

Simulation, Fabrication and Characterization of THz Metamaterial Absorbers
13:44

Simulation, Fabrication and Characterization of THz Metamaterial Absorbers

Published on: December 27, 2012

15.9K

Distributed feedback lasing based on a negative-index metamaterial waveguide.

Bryce A Tennant, Riffat Ara, Abdulaziz Atwiri

    Optics Letters
    |September 14, 2019
    PubMed
    Summary
    This summary is machine-generated.

    Researchers developed a novel distributed feedback (DFB) laser using coupled positive-index and negative-index metamaterial waveguides. This innovative design enables tunable single-mode lasing without traditional gratings.

    More Related Videos

    Positive and Negative Feedback Loops
    01:18

    Positive and Negative Feedback Loops

    24.9K
    Fabricating Metamaterials Using the Fiber Drawing Method
    11:57

    Fabricating Metamaterials Using the Fiber Drawing Method

    Published on: October 18, 2012

    14.3K

    Related Experiment Videos

    Last Updated: Jan 19, 2026

    Simulation, Fabrication and Characterization of THz Metamaterial Absorbers
    13:44

    Simulation, Fabrication and Characterization of THz Metamaterial Absorbers

    Published on: December 27, 2012

    15.9K
    Positive and Negative Feedback Loops
    01:18

    Positive and Negative Feedback Loops

    24.9K
    Fabricating Metamaterials Using the Fiber Drawing Method
    11:57

    Fabricating Metamaterials Using the Fiber Drawing Method

    Published on: October 18, 2012

    14.3K

    Area of Science:

    • Optics and Photonics
    • Materials Science
    • Nanotechnology

    Background:

    • Traditional distributed feedback (DFB) lasers rely on Bragg gratings for optical feedback.
    • Metamaterials offer unique electromagnetic properties not found in natural materials.
    • Coupling active materials with metamaterials presents new avenues for laser design.

    Purpose of the Study:

    • To introduce a new type of grating-less DFB laser.
    • To investigate optical feedback mechanisms using evanescent coupling between waveguides.
    • To explore the potential for single-mode and broadband lasing.

    Main Methods:

    • Formulation and solution of active positive-index material (PIM) and negative-index metamaterial (NIM) coupled-mode equations.
    • Characterization of the dispersion relation and resonant optical gain.
    • Analysis of lasing properties based on waveguide wavenumber differences.

    Main Results:

    • Demonstrated a novel DFB laser design based on PIM-NIM waveguide coupling.
    • The photonic bandgap is controlled by the difference in waveguide wavenumbers, not a Bragg wavenumber.
    • Achieved tunable single-mode lasing, with potential for broadband operation.

    Conclusions:

    • This PIM-NIM coupled waveguide structure offers a new paradigm for grating-less DFB lasers.
    • The ability to control lasing modes via wavenumber difference provides enhanced tunability.
    • The proposed laser architecture holds promise for advanced photonic applications requiring single-mode broadband emission.