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The ancient silk fibre finds new application as a bio-chemically functional optofluidic material. We demonstrate a silk protein diffraction grating doped with human haemoglobin. The haemoglobin remains chemically active within the grating and responds spectrally to ambient gas concentration. The grating performs a dual role of providing spectral analysis and a bio-chemical substrate in one component.
© 2011 Optical Society of America
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