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Two-dimensional stretchable blazed wavelength-tunable grating based on PDMS

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Abstract

This paper reports a two-dimensional stretchable blazed wavelength-tunable grating based on polydimethylsiloxane (PDMS). In the elastic range, stretch the grating along ($Y$-axis) and perpendicular to ($X$-axis) the grating line, fix the position of the ${+}{{1}}$st-order spot to maintain the grating period, and only change the groove angle to tune the blazed wavelength. By stretching the grating up to 20% of the $Y$-axis, and 5.2% of the $X$-axis, the groove angle is reduced by 1.33°, and the blazed wavelength of the first-order diffraction shifts toward the short-wave direction by 42.3 nm. The sensitivity of a spectrometer can be enhanced by tuning the blazed wavelength of the PDMS grating to the wavelength of the spectrum peak under observation in the bands from 460.8 nm to 503.1 nm.

© 2020 Optical Society of America

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