Abstract

We describe the concept of a super compact diffractive imaging spectrometer, with optical components a few millimeters across in all dimensions, capable of detecting optical fluorescence spectra within the entire visible spectral range from $400\mathrm{nm}$ to $700\mathrm{nm}$ with resolution of the order of 2 nm. In addition, the proposed spectrometer is capable of working simultaneously with multiple, up to 35, independent input optical channels. A specially designed diffractive optical element integrated with a planar optical waveguide is the key component of the proposed device. In the preliminary experimental tests, a uniform waveguide grating with a microlens was used to mimic operation of the diffractive optical element. A microspectrometer with optical components measured below 1 cm in all dimensions covers the spectral range from $450\mathrm{nm}$ to $650\mathrm{nm}$ and shows a spectral resolution of $0.5\mathrm{nm}$ at wavelengths close to $514\mathrm{nm}$ and $633\mathrm{nm}$.

© 2006 Optical Society of America

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