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Related Concept Videos

Double Resonance Techniques: Overview01:12

Double Resonance Techniques: Overview

Double resonance techniques in Nuclear Magnetic Resonance (NMR) spectroscopy involve the simultaneous application of two different frequencies or radiofrequency pulses to manipulate and observe two distinct nuclear spins. One important application of double resonance is spin decoupling, which selectively suppresses coupling with one type of nucleus while observing the NMR signal from another nucleus, simplifying the spectrum and enhancing resolution.
Spin decoupling is usually achieved by...
¹H NMR: Complex Splitting01:13

¹H NMR: Complex Splitting

A proton M that is coupled to a proton X results in doublet signals for M. However, NMR-active nuclei can be simultaneously coupled to more than one nonequivalent nucleus. When M is coupled to a second proton A, such as in styrene oxide, each peak in the doublet is split into another doublet.
Splitting diagrams or splitting tree diagrams are routinely used to depict such complex couplings. While drawing splitting diagrams, the splitting with the larger coupling constant is usually applied first.
Sound Waves: Resonance01:14

Sound Waves: Resonance

Resonance is produced depending on the boundary conditions imposed on a wave. Resonance can be produced in a string under tension with symmetrical boundary conditions (i.e., has a node at each end). A node is defined as a fixed point where the string does not move. The symmetrical boundary conditions result in some frequencies resonating and producing standing waves, while other frequencies interfere destructively. Sound waves can resonate in a hollow tube, and the frequencies of the sound...
Resonance and Hybrid Structures02:16

Resonance and Hybrid Structures

According to the theory of resonance, if two or more Lewis structures with the same arrangement of atoms can be written for a molecule, ion, or radical, the actual distribution of electrons is an average of that shown by the various Lewis structures.
Resonance Structures and Resonance Hybrids
The Lewis structure of a nitrite anion (NO2−) may actually be drawn in two different ways, distinguished by the locations of the N–O and N=O bonds.
Concept of Resonance and its Characteristics01:19

Concept of Resonance and its Characteristics

If a driven oscillator needs to resonate at a specific frequency, then very light damping is required. An example of light damping includes playing piano strings and many other musical instruments. Conversely, to achieve small-amplitude oscillations as in a car's suspension system, heavy damping is required. Heavy damping reduces the amplitude, but the tradeoff is that the system responds at more frequencies. Speed bumps and gravel roads prove that even a car's suspension system is not immune...
¹H NMR of Conformationally Flexible Molecules: Temporal Resolution00:52

¹H NMR of Conformationally Flexible Molecules: Temporal Resolution

At room temperature, the chair conformer of cyclohexane undergoes rapid ring flipping between two equivalent chair conformers at a rate of approximately 105 times per second. These two chair conformers are in equilibrium. The rapid ring flipping results in the interconversion of the axial proton to an equatorial proton and an equatorial to the axial proton. Such interconversions are too rapid and cannot be detected on the NMR timescale. Hence, the NMR spectrometer cannot distinguish between the...

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Related Experiment Video

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Fabrication of Nanopillar-Based Split Ring Resonators for Displacement Current Mediated Resonances in Terahertz Metamaterials
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Resonance splitting in gyrotropic ring resonators.

Dirk Jalas1, Alexander Petrov, Michael Krause

  • 1Institute of Optical and Electronic Materials, Hamburg University of Technology, D-21073 Hamburg, Germany.

Optics Letters
|October 23, 2010
PubMed
Summary

We propose a novel silicon ring resonator optical isolator. This device utilizes resonance splitting in a magneto-optical polymer cladding to achieve a compact 10μm footprint, offering efficient optical isolation.

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Area of Science:

  • Photonics and optical engineering
  • Materials science

Background:

  • Optical isolators are crucial components in photonic integrated circuits, preventing back-reflections.
  • Silicon ring resonators offer a scalable platform for integrated optics.
  • Magneto-optical materials enable non-reciprocal light propagation.

Purpose of the Study:

  • To theoretically investigate an optical isolator concept using a silicon ring resonator.
  • To explore the use of magneto-optical polymer cladding for resonance splitting.
  • To demonstrate the feasibility of a compact integrated optical isolator.

Main Methods:

  • Derivation of a perturbation method for analyzing modes in a cylindrical coordinate system.
  • Modeling of a silicon ring resonator with magneto-optical polymer cladding.
  • Simulation of resonance splitting for clockwise and counterclockwise modes.

Main Results:

  • Resonance splitting increases with decreasing ring radius.
  • A splitting of 29 GHz was demonstrated for a ring radius of approximately 1.5 μm.
  • The proposed device has a small geometrical footprint of 10 μm.

Conclusions:

  • A theoretical concept for an optical isolator based on resonance splitting is presented.
  • The design utilizes a silicon ring resonator and magneto-optical polymer cladding.
  • The proposed integrated optical isolator is compact and efficient.