Scatterings
One-step Rainbow Grating
A low-cost, single-step method makes reflection gratings with tailored, variable periods.
A rainbow-colored grating, about 25 mm wide, lit by sunlight. Enlarged images show the grating surface with slowly varying period. Black bars = 10 µm.
A low-cost, single-step method makes reflection gratings with tailored, variable periods. A group led by University at Buffalo (U.S.A.) engineering professors Qiaoqiang Gan and Alexander N. Cartwright reports making graded holographic photopolymer gratings that produce a rainbow-colored reflection image (Adv. Mater., doi:10.1002/adma.201104628). The gratings could be integrated with detectors or imagers to create compact spectroscopic analyzers.
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