Terahertz-wave generation in a conventional optical fiber

Area of Science:

• Nonlinear Optics
• Terahertz (THz) Photonics
• Optical Fiber Technology

Background:

• Terahertz (THz) wave generation is crucial for various scientific and technological applications.
• Existing THz sources often face limitations in terms of size, efficiency, or tunability.
• Optical fibers offer a robust platform for light manipulation and propagation.

Purpose of the Study:

• To theoretically propose a novel method for generating terahertz (THz) waves.
• To achieve both surface-emitted and collinear phase-matched THz-wave generation.
• To utilize a conventional optical fiber as the active medium for THz-wave generation.

Main Methods:

• Theoretical investigation of terahertz (THz) wave generation.
• Application of third-order nonlinear effect: four-wave mixing (FWM).
• Utilizing a single-mode optical fiber for surface-emitted THz-wave generation.
• Achieving phase matching at ~800 nm and 1.5 microm pumping wavelengths.

Main Results:

• Demonstrated surface-emitted THz-wave generation via FWM in a single-mode fiber.
• Achieved perfect phase matching, enabling uniform third-order polarization.
• Optical fiber effectively functions as a phased array antenna for THz waves.
• Obtained collinear phase-matched THz waves propagating in the silica cladding.

Conclusions:

• The proposed method offers a promising route for compact and efficient terahertz (THz) wave generation.
• Optical fibers can serve as a versatile platform for integrated THz photonics.
• The technique facilitates both surface-emitted and collinear THz wave propagation.