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High focusing grating reflectors with TE-polarized normal incidence

马婷;袁晓东;叶卫民;徐威;秦石乔;朱志宏

  We design two types of reflectors by using subwavelength high-index contrast gratings,which exhibit similar high focusing capabilities at normal incidence with a TE-polarized plane wave.One type has bars of different heights,whereas the other has bars of different depths.Both grating reflectors are designed to be approximately 22 μm in structural length and 10 μm in focal length,at an operating wavelength of 1.55 μm.Both achieve a full-width-half-maximum of 0.9 μm at the focal plane,which is fairly close to the diffraction limit.Their reflectance reach as high as 94% and 91%.……