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Optical waveguide mode control by nanoslit-enhanced terahertz field.

A Novitsky1, M Zalkovskij, R Malureanu

  • 1DTU Fotonik-Department of Photonics Engineering, Technical University of Denmark, Kgs. Lyngby, Denmark. andrey.novitsky@tut.by

Optics Letters
|October 9, 2012
PubMed
Summary

This study introduces a method to control optical waveguide modes using terahertz (THz) waves. Optimized overlap and enhanced THz fields enable tunable optical properties for photonic devices.

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Area of Science:

  • Photonics
  • Optoelectronics
  • Terahertz Science

Background:

  • Optical waveguide modes are fundamental to photonic integrated circuits.
  • Control over these modes is crucial for advanced optical functionalities.
  • Terahertz (THz) waves offer unique properties for modulating optical signals.

Purpose of the Study:

  • To propose and investigate a scheme for controlling optical waveguide modes using THz waves.
  • To optimize the interaction between optical modes and THz fields.
  • To explore potential applications in optical switching and modulation.

Main Methods:

  • Numerical simulations to model the interaction between optical and THz fields.
  • Optimization of waveguide geometry and metallic nanoslit placement.

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  • Analysis of optical mode attenuation and nonlinear refractive index changes.

    • Main Results:

    • An optimized overlap between optical modes and enhanced THz fields was achieved.
    • A balance was found between optical loss and THz-induced refractive index change.
    • A 10 kV/cm THz field was shown to induce a 0.001 nonlinear refractive index change, sufficient for a π/2 phase shift.

    Conclusions:

    • The proposed scheme offers effective control of optical waveguide modes via THz waves.
    • Experimental observation of the effect is deemed feasible.
    • The method has potential applications in tunable optical devices like Mach-Zehnder interferometers.