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Related Concept Videos

NMR Spectrometers: Radiofrequency Pulses and Pulse Sequences01:17

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A pulse is a short burst of radio waves distributed over a range of frequencies that simultaneously excites all the nuclei in the sample. Upon passing a radio frequency pulse along the x-axis, the nuclei absorb energy corresponding to their Larmor frequencies and achieve resonance. This shifts the net magnetization vector from the z-axis toward the transverse plane. This angle of rotation of the magnetization vector, or the flip angle, is proportional to the duration and intensity of the pulse.
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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...
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Updated: Jan 11, 2026

Microwave Photonics Systems Based on Whispering-gallery-mode Resonators
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Shaping Ultrafast Pulses for Enhanced Resonant Nonlinear Interactions.

Omri Meron1,2, Snir Nehemia1,2, Uri Arieli1,2

  • 1Condensed Matter Physics Department, School of Physics and Astronomy, Faculty of Exact Sciences, Tel Aviv University, Tel Aviv 6997801, Israel.

Nano Letters
|November 17, 2025
PubMed
Summary
This summary is machine-generated.

Shaped ultrafast pulses enhance resonant nonlinear processes in nanostructures. We found two enhancement regimes, one compensating dispersion and another using counterintuitive polarization for constructive interference.

Keywords:
Coherent ControlLSPRNonlinear OpticsPlasmonicPulse shapingUltrafast Physics

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Area of Science:

  • Nonlinear optics
  • Quantum control
  • Plasmonics

Background:

  • Shaped ultrafast pulses steer light-matter interactions.
  • Antisymmetric spectral phases drive nonresonant transitions.
  • Resonant transitions suffer from material dispersion, reducing efficiency.

Purpose of the Study:

  • Investigate spectral phase effects on resonant multiphoton transitions.
  • Explore enhancement mechanisms beyond dispersion compensation.
  • Utilize arctangent spectral phase shaping for four-wave mixing.

Main Methods:

  • Sub-10 fs single-pulse four-wave mixing experiments.
  • Utilized arctangent spectral phase shaping.
  • Theoretical analysis of nonlinear optical phenomena.

Main Results:

  • Identified two distinct enhancement regimes for resonant nonlinear processes.
  • One regime compensates for material dispersion.
  • A counterintuitive regime induces antisymmetric polarization for constructive interference.

Conclusions:

  • Arctangent spectral phase shaping offers new pathways for enhancing resonant nonlinear processes.
  • Two distinct mechanisms contribute to enhanced nonlinear efficiency.
  • Understanding scaling behaviors with harmonic order and quality factor is key.