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

Modes of Standing Waves - I01:03

Modes of Standing Waves - I

3.1K
A close look at earthquakes provides evidence for the conditions appropriate for resonance, standing waves, and constructive and destructive interference. A building may vibrate for several seconds with a driving frequency matching the building's natural frequency of vibration; this produces a resonance that results in one building collapsing while the neighboring buildings do not. Often, buildings of a certain height are devastated, while other taller buildings remain intact. This...
3.1K
¹H NMR: Interpreting Distorted and Overlapping Signals01:02

¹H NMR: Interpreting Distorted and Overlapping Signals

1.1K
Spin systems where the difference in chemical shifts of the coupled nuclei is greater than ten times J are called first-order spin systems. These nuclei are weakly coupled, and their chemical shifts and coupling constant can generally be estimated from the well-separated signals in the spectrum.
As Δν decreases and the signals move closer, the doublets appear increasingly distorted. The intensities of the inner lines increase at the cost of those of the outer lines as the signals are...
1.1K
Linear Approximation in Frequency Domain01:26

Linear Approximation in Frequency Domain

144
Linear systems are characterized by two main properties: superposition and homogeneity. Superposition allows the response to multiple inputs to be the sum of the responses to each individual input. Homogeneity ensures that scaling an input by a scalar results in the response being scaled by the same scalar.
In contrast, nonlinear systems do not inherently possess these properties. However, for small deviations around an operating point, a nonlinear system can often be approximated as linear....
144
Second-Order Circuits01:17

Second-Order Circuits

1.7K
Integrating two fundamental energy storage elements in electrical circuits results in second-order circuits, encompassing RLC circuits and circuits with dual capacitors or inductors (RC and RL circuits). Second-order circuits are identified by second-order differential equations that link input and output signals.
Input signals typically originate from voltage or current sources, with the output often representing voltage across the capacitor and/or current through the inductor. For example, in...
1.7K
Aliasing01:18

Aliasing

253
Accurate signal sampling and reconstruction are crucial in various signal-processing applications. A time-domain signal's spectrum can be revealed using its Fourier transform. When this signal is sampled at a specific frequency, it results in multiple scaled replicas of the original spectrum in the frequency domain. The spacing of these replicas is determined by the sampling frequency.
If the sampling frequency is below the Nyquist rate, these replicas overlap, preventing the original...
253
Oscillations In An LC Circuit01:30

Oscillations In An LC Circuit

2.5K
An idealized LC circuit of zero resistance can oscillate without any source of emf by shifting the energy stored in the circuit between the electric and magnetic fields. In such an LC circuit, if the capacitor contains a charge q before the switch is closed, then all the energy of the circuit is initially stored in the electric field of the capacitor. This energy is given by
2.5K

You might also read

Related Articles

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

Sort by
Same author

Anharmonic phonons via quantum thermal bath simulations.

The Journal of chemical physics·2026
Same author

How do diluent-aggregates interactions affect the structure of colloidal systems in solvent extraction?

The Journal of chemical physics·2026
Same author

From mesoscopic to macroscopic models of reactive Brownian nanoparticles.

The Journal of chemical physics·2026
Same author

Modeling the Vibrational Circular Dichroism Spectroscopy of Phenylcyclohexanediol Solvated in Dimethyl Sulfoxide Using Polarizable Molecular Dynamics.

The journal of physical chemistry. B·2026
Same author

Liquid water under vibrational strong coupling: An extended cavity Born-Oppenheimer molecular dynamics study.

The Journal of chemical physics·2025
Same author

Inter cross-linking microgels by superchaotropic nano-ions at interface: Controlled stabilization of emulsions.

Journal of colloid and interface science·2025

Related Experiment Video

Updated: Sep 23, 2025

Harmonic Nanoparticles for Regenerative Research
09:23

Harmonic Nanoparticles for Regenerative Research

Published on: May 1, 2014

11.8K

Why local and non-local terms are essential for second harmonic generation simulation?

Yann Foucaud1, Jean-François Dufrêche1, Bertrand Siboulet1

  • 1ICSM, Univ Montpellier, CEA, CNRS, ENSCM, Marcoule, France. yann.foucaud@gmail.com.

Physical Chemistry Chemical Physics : PCCP
|May 17, 2022
PubMed
Summary

Simulating Second Harmonic Generation (SHG) requires accounting for both local dipole and non-local quadrupole contributions at interfaces. Including quadrupole effects is essential for accurate SHG signal prediction, especially at interfaces like water/air.

More Related Videos

20 mJ, 1 ps Yb:YAG Thin-disk Regenerative Amplifier
10:17

20 mJ, 1 ps Yb:YAG Thin-disk Regenerative Amplifier

Published on: July 12, 2017

11.7K
Multimodal Optical Imaging Platform for Studying Cellular Metabolism
04:47

Multimodal Optical Imaging Platform for Studying Cellular Metabolism

Published on: June 6, 2025

650

Related Experiment Videos

Last Updated: Sep 23, 2025

Harmonic Nanoparticles for Regenerative Research
09:23

Harmonic Nanoparticles for Regenerative Research

Published on: May 1, 2014

11.8K
20 mJ, 1 ps Yb:YAG Thin-disk Regenerative Amplifier
10:17

20 mJ, 1 ps Yb:YAG Thin-disk Regenerative Amplifier

Published on: July 12, 2017

11.7K
Multimodal Optical Imaging Platform for Studying Cellular Metabolism
04:47

Multimodal Optical Imaging Platform for Studying Cellular Metabolism

Published on: June 6, 2025

650

Area of Science:

  • Interface science
  • Nonlinear optics
  • Computational chemistry

Background:

  • Second Harmonic Generation (SHG) is a powerful technique for interface analysis.
  • The molecular origin of SHG signals is debated due to competing dipole and quadrupole contributions.
  • Understanding these contributions is crucial for accurate interpretation of experimental SHG data.

Purpose of the Study:

  • To develop and validate a method for simulating SHG signals at a model water/air interface.
  • To investigate the relative importance of local dipole and non-local quadrupole contributions to the SHG response.
  • To assess the impact of molecular environment on hyperpolarizability and its role in SHG.

Main Methods:

  • Molecular response simulation incorporating local (dipole) and non-local (quadrupole) terms.
  • Modeling the dependency of polarizability and hyperpolarizability on the molecular chemical environment.
  • Representation of the bulk quadrupole response.

Main Results:

  • Simulations show that dipole contributions alone are insufficient to model SHG signals, even with environmental effects.
  • The bulk quadrupole contribution significantly dominates the dipole contribution.
  • Including the quadrupole term is essential for predicting SHG response accurately.

Conclusions:

  • Accurate SHG simulation necessitates the inclusion of both local and non-local molecular contributions.
  • Non-local quadrupole effects are critical and often dominant in determining the overall SHG signal at interfaces.
  • Considering the influence of the local chemical environment enhances the accuracy of SHG predictions.