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

Carrier Generation and Recombination

Carrier Generation and Recombination

Carrier generation is the process by which electron-hole pairs (EHPs) are created within the semiconductor. In direct-bandgap semiconductors, such as gallium arsenide (GaAs), this occurs efficiently when energy absorption prompts valence electrons to leap into the conduction band, leaving behind holes.
This process is given by the generation rate G and is efficient due to the conservation of momentum between the valence band maximum and conduction band minimum.
Indirect generation involves an...

Atomic Nuclei: Nuclear Relaxation Processes

Atomic Nuclei: Nuclear Relaxation Processes

In the absence of an external magnetic field, nuclear spin states are degenerate and randomly oriented. When a magnetic field is applied, the spins begin to precess and orient themselves along (lower energy) or against (higher energy) the direction of the field. At equilibrium, a slight excess population of spins exists in the lower energy state. Because the direction of the magnetic field is fixed as the z-axis, the precessing magnetic moments are randomly oriented around the z-axis. This...

You might also read

Related Articles

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

Sort by

Same author

The national Australian survey about nurses' knowledge of evidence based guidelines for ventilated patients: and the Belgian national bundle campaign?

Intensive & critical care nursing·2020

Same author

Development of clinical pharmacy in Belgian hospitals through pilot projects funded by the government.

Acta clinica Belgica·2018

Same author

Improving the quality of the intensive care follow-up of ventilated patients during a national registration program.

Public health·2017

Same author

Switchable 3D liquid crystal grating generated by periodic photo-alignment on both substrates.

Soft matter·2015

Same author

Lanthanide-Assisted Deposition of Strongly Electro-optic PZT Thin Films on Silicon: Toward Integrated Active Nanophotonic Devices.

ACS applied materials & interfaces·2015

Same author

Optical gain from polyfluorene keto defects in a liquid crystal mixture.

Chemical communications (Cambridge, England)·2015

Search research articles

Related Experiment Video

Updated: Jun 22, 2026

Orientational Transition in a Liquid Crystal Triggered by the Thermodynamic Growth of Interfacial Wetting Sheets

Orientational Transition in a Liquid Crystal Triggered by the Thermodynamic Growth of Interfacial Wetting Sheets

Published on: May 15, 2017

Induced modulation instability and recurrence in nematic liquid crystals.

J Beeckman, X Hutsebaut, M Haelterman

|June 24, 2009

Summary

Researchers observed the Fermi-Pasta-Ulam recurrence in spatial optics within a nematic liquid crystal cell. This study marks the first experimental demonstration of this phenomenon in the spatial optical domain, validated by numerical simulations.

More Related Videos

Preparation of Liquid Crystal Networks for Macroscopic Oscillatory Motion Induced by Light

Preparation of Liquid Crystal Networks for Macroscopic Oscillatory Motion Induced by Light

Published on: September 20, 2017

High-Contrast and Fast Photorheological Switching of a Twist-Bend Nematic Liquid Crystal

High-Contrast and Fast Photorheological Switching of a Twist-Bend Nematic Liquid Crystal

Published on: October 31, 2019

Related Experiment Videos

Last Updated: Jun 22, 2026

Orientational Transition in a Liquid Crystal Triggered by the Thermodynamic Growth of Interfacial Wetting Sheets

Orientational Transition in a Liquid Crystal Triggered by the Thermodynamic Growth of Interfacial Wetting Sheets

Published on: May 15, 2017

Preparation of Liquid Crystal Networks for Macroscopic Oscillatory Motion Induced by Light

Preparation of Liquid Crystal Networks for Macroscopic Oscillatory Motion Induced by Light

Published on: September 20, 2017

High-Contrast and Fast Photorheological Switching of a Twist-Bend Nematic Liquid Crystal

High-Contrast and Fast Photorheological Switching of a Twist-Bend Nematic Liquid Crystal

Published on: October 31, 2019

Area of Science:

Nonlinear Optics
Liquid Crystal Physics
Spatial Dynamics

Background:

Modulation instability (MI) is a key phenomenon in nonlinear optics.
Nematic liquid crystals (NLCs) exhibit unique nonlinear optical properties.
The Fermi-Pasta-Ulam (FPU) recurrence is a phenomenon observed in nonlinear dynamical systems.

Purpose of the Study:

To experimentally investigate induced modulation instability in a nematic liquid crystal cell.
To explore the spatial frequency gain of perturbations under specific conditions.
To identify and confirm the manifestation of Fermi-Pasta-Ulam recurrence in the spatial optical domain.

Main Methods:

Launching two elliptical beams with slightly different angles into an NLC cell.
Creating a sinusoidally varying intensity profile at the cell entrance.
Analyzing the evolution of optical patterns and comparing with numerical simulations.

Main Results:

Observed the recurrence of optical signals under specific experimental conditions.
Investigated the gain of perturbations across a range of spatial frequencies.
Demonstrated good agreement between experimental findings and numerical simulations.

Conclusions:

The observed signal recurrence is believed to be the first experimental observation of Fermi-Pasta-Ulam recurrence in the spatial optical domain.
Nematic liquid crystals provide a viable medium for observing FPU recurrence in spatial optics.
The study validates the phenomenon through experimental observation and numerical simulation.