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Thermo-Tuning Fourier Transform Spectrometer Based on SU-8 Waveguide.

Qiongchan Shao1, Xiao Ma2, Mingyu Li3

  • 1State Key Laboratory of Extreme Photonics and Instrumentation, Centre for Integrated Optoelectronics, College of Optical Science and Engineering, Zhejiang University, Hangzhou 310027, China.

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Summary

We developed a compact, low-cost on-chip Fourier transform spectrometer (FTS) using a Mach-Zehnder interferometer (MZI). This device offers high throughput for spectral analysis within a small footprint.

Keywords:
Fourier transformMach-Zehnder interferometerthermal tuning

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Area of Science:

  • Photonics
  • Spectroscopy
  • Microfabrication

Background:

  • On-chip Fourier transform spectrometers (FTS) offer miniaturization and cost-effectiveness for spectral analysis.
  • Traditional spectrometers are often bulky and expensive, limiting their widespread application.
  • Integrated photonic devices are crucial for developing compact sensing technologies.

Purpose of the Study:

  • To design, fabricate, and characterize a novel Mach-Zehnder interferometer (MZI) based Fourier transform spectrometer (FTS) on a chip.
  • To demonstrate the feasibility of using SU-8 polymer waveguides for integrated spectroscopy.
  • To evaluate the performance metrics including footprint, spectral bandwidth, and resolution.

Main Methods:

  • Fabrication of a Mach-Zehnder interferometer (MZI) using SU-8 polymer waveguide technology.
  • Integration of a micro-heater for active tuning of the optical path length difference.
  • Characterization of the device by analyzing interference signals using Fourier transform algorithms.
  • Measurement of spectral bandwidth and resolution.

Main Results:

  • A compact FTS device with a footprint of only 2 × 12 mm2 was successfully fabricated.
  • The device achieved a spectral bandwidth of approximately 100 nm.
  • The spectral resolution was determined to be less than 20 nm.
  • The MZI optical path length difference was effectively tuned by a heater with low power consumption (max 2.2 W).

Conclusions:

  • The developed on-chip MZI FTS represents a promising technology for compact and cost-effective spectral analysis.
  • SU-8 polymer waveguides are suitable for fabricating integrated Fourier transform spectrometers.
  • The device's small size and performance metrics indicate potential for various applications requiring portable spectroscopy.