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Related Concept Videos

Modes of Standing Waves - I01:03

Modes of Standing Waves - I

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 phenomenon...
Modes of Standing Waves: II01:04

Modes of Standing Waves: II

The starting point for expressing the modes of standing waves is understanding the boundary conditions that the waves must follow. The boundary conditions are derived from the physical understanding of how the standing waves are sustained, that is, how the vibrating particles of the medium behave at the boundaries imposed on them.
For a tube open at one end and closed at the other filled with air, the modes are such that there is always an antinode at the open end and a node at the closed end.
Standing Waves01:17

Standing Waves

Sometimes waves do not seem to move; rather, they just vibrate in place. Unmoving waves can be seen on the surface of a glass of milk kept in a refrigerator, which is one example of standing waves. Vibrations from the refrigerator motor create waves on the milk that oscillate up and down but do not seem to move across the surface. These waves are formed or created by the superposition of two or more identical moving waves in opposite directions. The waves move through each other, with their...
Standing Electromagnetic Waves01:15

Standing Electromagnetic Waves

Electromagnetic waves can be reflected; the surface of a conductor or a dielectric can act as a reflector. As electric and magnetic fields obey the superposition principle, so do electromagnetic waves. The superposition of an incident wave and a reflected electromagnetic wave produces a standing wave analogous to the standing waves created on a stretched string.
Suppose a sheet of a perfect conductor is placed in the yz-plane, and a linearly polarized electromagnetic wave traveling in the...
Two-Dimensional (2D) NMR: Overview01:12

Two-Dimensional (2D) NMR: Overview

The 1D NMR spectrum of large and complex molecules like natural products has complicated splitting patterns and overlapping signals, which can be easily interpreted using 2-dimensional (2D) NMR. Unlike 1D NMR, 2D NMR has two frequency axes that provide the coupling information between the nucleus A and nucleus B in a molecule. The process from which 2D spectra are obtained has four steps.
The first step is the preparation period, during which nucleus A is excited with a radiofrequency pulse.
¹H NMR: Interpreting Distorted and Overlapping Signals01:02

¹H NMR: Interpreting Distorted and Overlapping Signals

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 slanted or...

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Direct Imaging of Laser-driven Ultrafast Molecular Rotation
10:52

Direct Imaging of Laser-driven Ultrafast Molecular Rotation

Published on: February 4, 2017

Two-dimensional poling patterns for 3rd and 4th harmonic generation.

Andrew Norton, C de Sterke

    Optics Express
    |May 26, 2009
    PubMed
    Summary
    This summary is machine-generated.

    Researchers discovered optimal poling patterns for 2D nonlinear photonic crystals. This breakthrough enhances efficiency for 3rd and 4th harmonic generation in optical devices.

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    Published on: September 5, 2019

    Area of Science:

    • Photonics
    • Nonlinear Optics
    • Materials Science

    Background:

    • Nonlinear photonic crystals are crucial for frequency conversion.
    • Optimizing poling patterns is essential for efficient harmonic generation.
    • Existing methods for chi(2) nonlinear photonic crystals have limitations.

    Purpose of the Study:

    • To determine globally optimal poling patterns for 2D chi(2) photonic crystals.
    • To enhance 3rd and 4th harmonic generation efficiency.
    • To provide a theoretical framework for designing advanced nonlinear optical devices.

    Main Methods:

    • Computational modeling of nonlinear optical effects.
    • Optimization algorithms to search for poling patterns.
    • Analysis of 2-dimensional chi(2) nonlinear photonic crystal structures.

    Main Results:

    • Globally optimal poling patterns were identified for 2D chi(2) photonic crystals.
    • Significant improvements in 3rd and 4th harmonic generation were demonstrated.
    • The findings provide precise design guidelines for enhanced optical frequency conversion.

    Conclusions:

    • The study presents a method for achieving optimal poling in nonlinear photonic crystals.
    • This research advances the field of optical harmonic generation.
    • The results pave the way for more efficient nonlinear optical devices.