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Terahertz Microfluidic Sensing Using a Parallel-plate Waveguide Sensor
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Optical terahertz wave generation in a planar GaAs waveguide.

K L Vodopyanov1, Yu H Avetisyan

  • 1Edward L. Ginzton Laboratory, Stanford University, Stanford, California 94305, USA. vodopyan@stanford.edu

Optics Letters
|October 17, 2008
PubMed
Summary

We generated terahertz (THz) radiation using a gallium arsenide (GaAs) waveguide and phase-matched difference frequency mixing. This method produced 2 THz radiation with 1 microW average power, advancing THz wave generation techniques.

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Area of Science:

  • Optics and Photonics
  • Solid-State Physics
  • Electromagnetism

Background:

  • Terahertz (THz) radiation generation is crucial for various applications, including spectroscopy and imaging.
  • Efficiently generating THz waves at specific frequencies remains a challenge.
  • Planar waveguides offer a platform for integrated photonic devices.

Purpose of the Study:

  • To demonstrate the generation of terahertz (THz) radiation in a planar gallium arsenide (GaAs) waveguide.
  • To achieve phase-matched difference frequency mixing for THz wave production.
  • To characterize the generated THz radiation's frequency and power.

Main Methods:

  • Utilized a 61-microm-thick planar GaAs waveguide.
  • Employed phase-matched difference frequency mixing.

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  • Used signal and idler outputs from a near-degenerate type II synchronously pumped optical parametric oscillator (OPO) as the pump source.

    • Main Results:

    • Successfully generated THz radiation centered near 2 THz.
    • Achieved an average output power of 1 microW.
    • The pump source operated near 2 microm, with signal and idler powers of 250 mW and 750 mW, respectively.

    Conclusions:

    • Demonstrated efficient THz radiation generation in a planar GaAs waveguide via phase-matched difference frequency mixing.
    • The results show potential for integrated THz sources.
    • This method provides a viable route for producing tunable THz radiation.