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Optical spectrometer based on continuously-chirped guided mode resonance filter.

Yung-Jr Hung, Chia-Wei Kao, Tzu-Chieh Kao

|November 25, 2018

Summary

This summary is machine-generated.

We developed a tunable GMR filter using chirped gratings for optical spectrum analysis. This device enables precise wavelength sweeping and spectrum reconstruction of various light sources.

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Area of Science:

Photonics
Optical Engineering
Materials Science

Background:

Gratings are crucial optical components for manipulating light.
Tunable filters are essential for advanced optical sensing and analysis.
Existing filters often lack the precise tunability and bandwidth control required for complex spectral reconstruction.

Purpose of the Study:

To introduce a novel tunable GMR filter utilizing continuously period-chirped gratings.
To demonstrate the filter's capability for monotonic wavelength sweeping and stable spectral reconstruction.
To showcase the application of the chirped GMR filter in analyzing optical spectra of different light sources.

Main Methods:

Fabrication of a tunable GMR filter with continuously period-chirped gratings (ΔP = 130 nm) and a graded Ta2O5 waveguide layer (ΔT = 36 nm).
Utilized a modified Lloyd's mirror interferometer with a convex mirror for grating definition.
Employed masked e-beam evaporation for Ta2O5 film deposition.
Characterized the filter's performance under normal incidence for TE and TM polarized light.

Main Results:

Achieved sharp transmission dips at resonant wavelengths with filter bandwidths of ~4.2 nm (TE) and ~0.78 nm (TM).
Demonstrated monotonic wavelength sweeping from 500 to 700 nm with stable bandwidth and intensity.
Successfully reconstructed the optical spectra of a white light emitting diode and a dual-peak laser beam.

Conclusions:

The developed tunable GMR filter offers precise control over resonant wavelengths and bandwidth.
The filter's ability to sweep wavelengths monotonically enables accurate optical spectrum reconstruction.
This chirped GMR filter serves as a promising dispersive device for advanced spectral analysis applications.