Planar waveguide spectrometer

Donald S. Goldman; Patricia L. White; Norman C. Anheier Jr.

doi:10.1117/12.22978

1 November 1990 Planar waveguide spectrometer

Donald S. Goldman, Patricia L. White, Norman C. Anheier Jr.

Proceedings Volume 1338, Optoelectronic Devices and Applications; (1990) https://doi.org/10.1117/12.22978
Event: 34th Annual International Technical Symposium on Optical and Optoelectronic Applied Science and Engineering, 1990, San Diego, CA, United States

Abstract

An integrated optic consisting of buried diffraction gratings and a planar waveguide was developed as an internal reflectance element for broad-band spectroscopic analysis of liquids. Polystyrene or tantalum pentoxide waveguides were deposited over a pair of diffraction gratings etched into the surface of a glass slide. Multiwavelength light was focused through the substrate onto the first grating. Component wavelengths were coupled into the waveguide and spatially dispersed by the second grating after propagating through the waveguide. A silicon photodiode array detector was used to collect the spectral data. Our goal is to produce a compact, rapid spectrometer having no moving parts that can take advantage of fiber optics and fast array detectors in the visible and near-infrared regions for industrial process control. The thin planar waveguide provides enhanced sensitivity to analyze weaker absorptions in the near-infrared.

Citation Download Citation

Donald S. Goldman, Patricia L. White, and Norman C. Anheier Jr. "Planar waveguide spectrometer", Proc. SPIE 1338, Optoelectronic Devices and Applications, (1 November 1990); https://doi.org/10.1117/12.22978

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