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Caption : fig. s1. sem images of si gratings with (a) 300, (b) 400, (c) 500 and (d) 600 nm period, respectively. (e) statistical histograms of slits corresponding to si gratings.

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Caption : fig. s2. sem images of hmdg nanostructures with (a) 300, (b) 400, (c) 500 and (d) 600 nm period, respectively. (e) statistical histograms of slits corresponding to hmdg nanostructures.

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Caption : fig. s3. the definition of polarization. (a) p polarization and (b) s polarization.

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Caption : fig. s4. polarization dependent reflectance spectra obtained on hmdg-400 with 75° illumination angle at varied azimuthal angles for (a) unpolarization, (b) p polarization, and (c) s polarization.