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QExtra Technology Antireflection Coating
Apr 2013
HORIBA ScientificRequest Info
EDISON, N.J., April 30, 2013 — Horiba Scientific’s QExtra Technology is an antireflection multilayer coating designed to improve quantum efficiency of back-illuminated CCDs over a broad spectral range while suppressing etaloning effects in the near-IR region above 750 nm in back-thinned silicon scientific cameras.

The coating provides low-light-detection capabilities from 300 to 1000 nm with quantum efficiency higher than 90%, an advantage for spectroscopy experiments where the UV and NIR regions are important.

The increase in sensitivity combined with the company’s scientific cameras makes the back-illuminated CCDs suitable for low-light luminescence, fluorescence and Raman spectroscopy measurements.

QExtra Technology is available with Horiba Scientific’s Symphony II CCD and Synapse CCD cameras.


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antireflection coating
A thin layer of material applied to a lens surface to reduce the amount of reflected energy. Ideally the index of refraction of that material should be equal to the square root of the product of the indices of the material on either side of the coating, while the ideal thickness for a single-layer coating is one-quarter of the wavelength at which reflectance is to be minimized. See also multilayer coating.
A phenomenon that degrades the performance of thinned, back-illuminated CCDs. The effect is caused by lightwaves passing through the CCD and reflected at the rear surface, producing interference fringes when they interact with incoming waves.
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