Search research articles

ABOUT JoVE

Overview Leadership Blog JoVE Help Center

AUTHORS

Publishing Process Editorial Board Scope & Policies Peer Review FAQ Submit

LIBRARIANS

Testimonials Subscriptions Access Resources Library Advisory Board FAQ

RESEARCH

JoVE Journal Methods Collections JoVE Encyclopedia of Experiments Archive

EDUCATION

JoVE Core JoVE Business JoVE Science Education JoVE Lab Manual Faculty Resource Center Faculty Site

Terms & Conditions of Use

Related Concept Videos

Propagation of Waves

Propagation of Waves

When a wave propagates from one medium to another, part of it may get reflected in the first medium, and part of it may get transmitted to the second medium. In such a case, the interface of the two mediums can be considered as a boundary that is neither fixed nor free.
Consider a scenario where a wave propagates from a string of low linear mass density to a string of high linear mass density. In such a case, the reflected wave is out of phase with respect to the incident wave, however the...

The Wave Nature of Light

The Wave Nature of Light

The nature of light has been a subject of inquiry since antiquity. In the seventeenth century, Isaac Newton performed experiments with lenses and prisms and was able to demonstrate that white light consists of the individual colors of the rainbow combined together. Newton explained his optics findings in terms of a "corpuscular" view of light, in which light was composed of streams of extremely tiny particles traveling at high speeds according to Newton's laws of motion.

Reflection of Waves

Reflection of Waves

When a wave travels from one medium to another, it gets reflected at the boundary of the second medium. A common example of this is when a person yells at a distance from a cliff and hears the echo of their voice. The sound waves (longitudinal waves) traveling in the air are reflected from the bounding cliff. Similarly, flipping one end of a string whose other end is tied to a wall causes a pulse (transverse wave) to travel through the string, which gets reflected upon reaching the wall. In...

Space-Time Curvature and the General Theory of Relativity

Space-Time Curvature and the General Theory of Relativity

In 1905, Albert Einstein published his special theory of relativity. According to this theory, no matter in the universe can attain a speed greater than the speed of light in a vacuum, which thus serves as the speed limit of the universe.
This has been verified in many experiments. However, space and time are no longer absolute. Two observers moving relative to one another do not agree on the length of objects or the passage of time. The mechanics of objects based on Newton's laws of...

Electromagnetic Waves

Electromagnetic Waves

James Clerk Maxwell formulated a single theory combining all the electric and magnetic effects scientists knew during that time, calling the phenomena his theory predicted “Electromagnetic waves”. He brought together all the work that had been done by brilliant physicists such as Oersted, Coulomb, Gauss, and Faraday and added his own insights to develop the overarching theory of electromagnetism. Maxwell’s equations, combined with the Lorentz force law, encompass all the laws...

Electromagnetic Wave Equation

Electromagnetic Wave Equation

Maxwell's equations for electromagnetic fields are related to source charges, either static or moving. These fields act on a test charge, whose trajectory can thus be determined using suitable boundary conditions. The objective of electromagnetism is thus theoretically complete.
However, although electric and magnetic fields were first introduced as mathematical constructs to simplify the description of mutual forces between charges, a natural question emerges from Maxwell's equations:...

You might also read

Related Articles

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

Sort by

Same author

Optical cross-purity.

Optics letters·2026

Same author

Bridging the gap between ultrafast optics and resonant photonics in an omni-resonant Fabry-Pérot cavity.

Optics letters·2026

Same author

Observation of space-time surface plasmon polaritons.

Nature communications·2025

Same author

Resonance-free Fabry-Pérot cavity via unrestricted orbital-angular-momentum ladder-up.

Nature communications·2025

Same author

Ultrafast space-time optical merons in momentum-energy space.

Nature communications·2025

Same author

Optical spatiotemporal Fourier synthesis: tutorial.

Journal of the Optical Society of America. A, Optics, image science, and vision·2025

Search research articles

Related Experiment Video

Updated: Oct 17, 2025

Transmission of Multiple Signals through an Optical Fiber Using Wavefront Shaping

Transmission of Multiple Signals through an Optical Fiber Using Wavefront Shaping

Published on: March 20, 2017

Refraction of space-time wave packets: I. theoretical principles.

Murat Yessenov, Basanta Bhaduri, Ayman F Abouraddy

Journal of the Optical Society of America. A, Optics, Image Science, and Vision

|October 6, 2021

Summary

Space-time wave packets exhibit unique propagation properties. Their refraction at dielectric interfaces is governed by a new invariant, "spectral curvature," leading to novel phenomena like group-velocity invariance and anomalous refraction.

More Related Videos

Fabrication And Characterization Of Photonic Crystal Slow Light Waveguides And Cavities

Fabrication And Characterization Of Photonic Crystal Slow Light Waveguides And Cavities

Published on: November 30, 2012

Fabrication and Characterization of Disordered Polymer Optical Fibers for Transverse Anderson Localization of Light

Fabrication and Characterization of Disordered Polymer Optical Fibers for Transverse Anderson Localization of Light

Published on: July 29, 2013

Related Experiment Videos

Last Updated: Oct 17, 2025

Transmission of Multiple Signals through an Optical Fiber Using Wavefront Shaping

Transmission of Multiple Signals through an Optical Fiber Using Wavefront Shaping

Published on: March 20, 2017

Fabrication And Characterization Of Photonic Crystal Slow Light Waveguides And Cavities

Fabrication And Characterization Of Photonic Crystal Slow Light Waveguides And Cavities

Published on: November 30, 2012

Fabrication and Characterization of Disordered Polymer Optical Fibers for Transverse Anderson Localization of Light

Fabrication and Characterization of Disordered Polymer Optical Fibers for Transverse Anderson Localization of Light

Published on: July 29, 2013

Area of Science:

Optics
Wave Phenomena
Dielectric Materials

Background:

Space-time (ST) wave packets are pulsed optical beams with unique spatio-temporal structures.
These structures enable characteristics like propagation invariance and tunable group velocity.

Purpose of the Study:

To investigate the refraction of ST wave packets at planar interfaces between dielectrics.
To formulate a new law of refraction based on a spectral curvature invariant.

Main Methods:

Theoretical formulation of a new law of refraction for ST wave packets.
Derivation of refraction laws for baseband, X wave, and sideband ST wave packets.
Experimental confirmation of predicted refractive phenomena.

Main Results:

A novel optical refractive invariant, termed "spectral curvature," was identified.
The spectral curvature governs the change in ST wave-packet group velocity across interfaces.
Observed phenomena include group-velocity invariance, anomalous refraction, and group-velocity inversion.

Conclusions:

The spectral curvature invariant explains unique refraction behaviors of ST wave packets.
These phenomena are distinct from conventional optics due to the non-separability of spatial and temporal degrees of freedom.
The study predicts and experimentally confirms novel refractive behaviors dependent on the angle of incidence.