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IR Spectrometers01:25

IR Spectrometers

There are two main infrared (IR) spectrophotometers: dispersive IR spectrometers and Fourier transform infrared (FTIR) spectrometers. In a dispersive IR spectrometer, a beam of infrared radiation produced by a hot wire is divided into two parallel equal-intensity beams using mirrors. One beam passes through the sample, while another is a reference beam. The beams then move through the monochromator, which separates the radiations into a continuous spectrum of different frequencies. The...

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Fabrication And Characterization Of Photonic Crystal Slow Light Waveguides And Cavities
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Refractive index measurement of optical waveguides using modified end-fire coupling method.

Wan-Shao Tsai1, Sheng-Chieh Piao, Pei-Kuen Wei

  • 1Department of Applied Materials and Optoelectronics Engineering, National Chi-Nan University, No. 1, University Road, Puli, Nantou County 54561, Taiwan.

Optics Letters
|June 3, 2011
PubMed
Summary

A new end-fire coupling technique accurately reconstructs optical waveguide index profiles using differential optical fields and an inverse algorithm. This method enhances optical waveguide characterization for improved device performance.

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Area of Science:

  • Optics and Photonics
  • Materials Science

Background:

  • Accurate characterization of optical waveguide index profiles is crucial for designing and fabricating advanced photonic devices.
  • Existing methods for reconstructing waveguide index profiles can be complex or lack sufficient resolution.

Purpose of the Study:

  • To develop and demonstrate a modified end-fire coupling method for reconstructing two-dimensional (2D) optical waveguide index profiles.
  • To validate the method's accuracy using a known waveguide sample.

Main Methods:

  • Utilized a modified end-fire coupling approach to measure differential optical fields.
  • Employed a CCD camera for spatially perturbed image acquisition.
  • Applied an inverse algorithm based on the Helmholtz equation for profile reconstruction.
  • Incorporated a closed-loop piezoelectric stage and an oil-immersion objective lens for high-resolution measurements.

Main Results:

  • Successfully reconstructed the 2D index profiles of a single-mode fiber and a Ti:LiNbO(3) waveguide.
  • Demonstrated good agreement between the measured and known index profiles in the core regions.

Conclusions:

  • The modified end-fire coupling method provides an effective and accurate means for reconstructing 2D optical waveguide index profiles.
  • This technique offers a valuable tool for optical waveguide characterization and device optimization.