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Related Concept Videos

Double Resonance Techniques: Overview01:12

Double Resonance Techniques: Overview

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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.
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Updated: Feb 17, 2026

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Making two-photon processes dominate one-photon processes using mid-IR phonon polaritons.

Nicholas Rivera1, Gilles Rosolen2,3, John D Joannopoulos1

  • 1Department of Physics, Massachusetts Institute of Technology, Cambridge, MA 02139; joannop@mit.edu nrivera@mit.edu.

Proceedings of the National Academy of Sciences of the United States of America
|December 14, 2017
PubMed
Summary

Phonon polaritons enable highly efficient sources for generating pairs of light particles in the mid-infrared and terahertz ranges. This breakthrough accelerates two-photon emission, paving the way for novel quantum light sources.

Keywords:
Purcell effectlight–matter interactionsnanophotonicsphonon polaritonstwo-photon processes

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Area of Science:

  • Quantum optics
  • Condensed matter physics
  • Photonics

Background:

  • Phonon polaritons are hybrid light-phonon modes confined to polar dielectric surfaces.
  • Traditional light sources often emit single photons, limiting certain quantum applications.

Purpose of the Study:

  • To investigate the potential of phonon polaritons for creating efficient sources of photon pairs.
  • To explore the enhancement of two-photon emission processes using these hybrid modes.

Main Methods:

  • Theoretical modeling of emitter decay rates in the presence of phonon polaritons.
  • Analysis of confinement and bandwidth effects of phonon polaritons on emission processes.

Main Results:

  • Phonon polaritons facilitate preferential emission of photon pairs, significantly outperforming single-photon emission.
  • Two-photon emission via phonon polaritons occurs on nanosecond timescales, orders of magnitude faster than in free space.
  • The effect is robust across various polar dielectric materials like hexagonal boron nitride and silicon carbide.

Conclusions:

  • Phonon polaritons offer a viable strategy for designing efficient quantum light sources in the mid-IR/terahertz spectrum.
  • These sources can emit photon pairs with a broad spectrum, enabling new possibilities for single and multiple photon generation.