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A household microwave and lasers are examples of standing electromagnetic waves in a cavity. When two conducting metal plates are placed parallel at the nodal planes, it creates a cavity where standing waves are formed. The cavity between the two planes is analogous to a stretched string held at the points x = 0 and x = L. Here, the distance 'L' between the two planes must be an integer multiple of half of the wavelength. The wavelengths that satisfy this condition are given by:
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Continuous-wave frequency upconversion with a molecular optomechanical nanocavity.

Wen Chen1, Philippe Roelli1, Huatian Hu2

  • 1Institute of Physics, Ecole Polytechnique Fédérale de Lausanne (EPFL), CH-1015 Lausanne, Switzerland.

Science (New York, N.Y.)
|December 2, 2021
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Summary
This summary is machine-generated.

We demonstrate a novel method for converting mid-infrared light to visible light using molecular optomechanics in a plasmonic nanocavity. This technique enhances upconversion efficiency by 13 orders of magnitude, enabling new applications in spectroscopy and sensing.

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Area of Science:

  • Optics and Photonics
  • Molecular Spectroscopy
  • Nanotechnology

Background:

  • Coherent upconversion of terahertz and mid-infrared signals to visible light is crucial for advanced spectroscopy, imaging, and sensing.
  • Conventional nonlinear optics face challenges in achieving efficient upconversion, especially at low signal powers.

Purpose of the Study:

  • To demonstrate optomechanical transduction of mid-infrared signals into the visible domain using a plasmonic nanocavity with molecules.
  • To achieve significant enhancement in upconversion efficiency per molecule at ambient conditions.

Main Methods:

  • Utilized a plasmonic nanocavity containing a few hundred molecules to host optomechanical transduction.
  • Applied submicrowatt continuous-wave mid-infrared (32 THz) signals to resonantly drive collective molecular vibrations.
  • Imprinted molecular vibration onto a visible pump laser, generating upconverted Raman sidebands.

Main Results:

  • Achieved optomechanical transduction of mid-infrared signals to the visible domain at ambient conditions.
  • Demonstrated upconverted Raman sidebands with subnatural linewidth.
  • The dual-band nanocavity provided an estimated 13 orders of magnitude enhancement in upconversion efficiency per molecule.

Conclusions:

  • Molecular cavity optomechanics offers a flexible paradigm for frequency conversion.
  • Tailorable molecular and plasmonic properties can be leveraged for enhanced upconversion.
  • This approach opens new possibilities for spectroscopy, imaging, and sensing applications.