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Related Concept Videos

¹³C NMR: Distortionless Enhancement by Polarization Transfer (DEPT)01:20

¹³C NMR: Distortionless Enhancement by Polarization Transfer (DEPT)

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When proton-coupled carbon-13 spectra are simplified by a broadband proton decoupling technique, structural information about the coupled protons is lost. Distortionless enhancement by polarization transfer (DEPT) is a technique that provides information on the number of hydrogens attached to each carbon in a molecule. While the DEPT experiment utilizes complex pulse sequences, the pulse delay and flip angle are specifically manipulated. The resulting signals have different phases depending on...
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Double Resonance Techniques: Overview01:12

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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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¹³C NMR: ¹H–¹³C Decoupling01:04

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The probability of having two carbon-13 atoms next to each other is negligible because of the low natural abundance of carbon-13. Consequently, peak splitting due to carbon-carbon spin-spin coupling is not observed in spectra. However, protons up to three sigma bonds away split the carbon signal according to the n+1 rule, resulting in complicated spectra.
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Carrier Generation and Recombination01:22

Carrier Generation and Recombination

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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.
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Deactivation Processes: Jablonski Diagram01:25

Deactivation Processes: Jablonski Diagram

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Luminescence, the emission of light by a substance that has absorbed energy, is a process that involves the interaction of molecules with light. The energy-level diagram, or Jablonski diagram, is a graphical representation of these interactions, illustrating the various states and transitions a molecule can undergo. In a typical Jablonski diagram, the lowest horizontal line represents the ground-state energy of the molecule, which is usually a singlet state. This state represents the energies...
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Updated: Jun 8, 2025

Generation and Coherent Control of Pulsed Quantum Frequency Combs
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Dephasingless two-color terahertz generation.

Tanner T Simpson1,2, Jeremy J Pigeon3, Kyle G Miller3

  • 1Laboratory for Laser Energetics, University of Rochester, Rochester, NY, 14623-1299, USA. tsim@lle.rochester.edu.

Scientific Reports
|November 4, 2024
PubMed
Summary
This summary is machine-generated.

Researchers developed a new optical setup to create a powerful, single-cycle terahertz (THz) pulse. This method overcomes dispersion issues, enabling THz radiation with reduced angular spread for advanced applications.

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Design, Fabrication, and Experimental Characterization of Plasmonic Photoconductive Terahertz Emitters
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Area of Science:

  • Optics and Photonics
  • Ultrafast Science
  • Terahertz (THz) Technology

Background:

  • Broadband terahertz (THz) radiation is generated by photoionized electron currents driven by multi-color laser pulses.
  • Dispersion in optical media causes phase evolution between laser harmonics, leading to dephasing and multi-cycle THz pulses with significant angular dispersion.

Purpose of the Study:

  • To introduce a novel optical configuration that compensates for phase evolution during THz pulse generation.
  • To enable the formation of a high-quality, single-cycle THz pulse with minimal angular dispersion.

Main Methods:

  • Utilizing the spherical aberration of an axilens to control the phase of the laser pulse.
  • Mapping a radial phase variation to a longitudinal phase variation using the axilens.
  • Combining the axilens configuration with an ultrashort flying focus technique.

Main Results:

  • Demonstrated compensation of relative phase evolution between laser harmonics.
  • Achieved the formation of a single-cycle THz pulse with significantly reduced angular dispersion.
  • Obtained THz pulses with 1/4 the angular divergence compared to conventional methods.

Conclusions:

  • The novel optical configuration effectively mitigates dispersion-induced dephasing in THz generation.
  • This technique allows for the generation of high-intensity, low-divergence single-cycle THz pulses.
  • The method offers precise control over THz pulse characteristics, including emission angle and spectral properties.