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Terahertz emission from diamond nitrogen-vacancy centers.

Sándor Kollarics1,2,3, Bence Gábor Márkus3,4, Robin Kucsera1,2

  • 1Department of Physics, Institute of Physics, Budapest University of Technology and Economics, Műegyetem rkp.3, H-1111 Budapest, Hungary.

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We generated terahertz radiation using diamond nitrogen-vacancy centers. This method achieves population inversion via Zeeman splitting and optical pumping, paving the way for tunable terahertz sources.

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Area of Science:

  • Quantum optics
  • Solid-state physics
  • Spectroscopy

Background:

  • Coherent terahertz (THz) light sources are crucial for advanced research and applications.
  • Terahertz lasers require population inversion for efficient operation.
  • Nitrogen-vacancy (NV) centers in diamond are promising solid-state systems for quantum applications.

Purpose of the Study:

  • To demonstrate terahertz radiation generation using NV centers in diamond.
  • To achieve population inversion in NV centers for THz emission.
  • To explore the tunability of NV-center-based THz sources.

Main Methods:

  • Utilizing Zeeman splitting of the NV center's S=1 state in a 15 tesla magnetic field.
  • Selective optical pumping of the NV center's sublevels using visible light.
  • Employing a phase-sensitive THz setup optimized for electron spin resonance (ESR) measurements.
  • Conducting light-induced ESR measurements to determine spin-lattice relaxation times.

Main Results:

  • Successful generation of terahertz radiation from NV centers in diamond.
  • Achieved population inversion through Zeeman splitting and optical pumping, with a THz splitting of 0.42 THz.
  • Determined spin-lattice relaxation time, confirming phonon-mediated relaxation and efficient population inversion.
  • Demonstrated magnetic field tunability of the generated terahertz radiation.

Conclusions:

  • NV centers in diamond can serve as a novel platform for generating tunable terahertz radiation.
  • The demonstrated method offers a pathway towards next-generation coherent and tunable THz sources.
  • Understanding spin-lattice relaxation is key to optimizing population inversion and THz emission efficiency.