We described a highly efficient polarizing beam splitter (PBS) of a deep-etched binary-phase fused-silica grating, where TE- and TM-polarized waves are mainly diffracted in the -1st and 0th orders, respectively. To achieve a high extinction ratio and diffraction efficiency, the grating depth and period are optimized by using rigorous coupled-wave analysis, which can be well explained based on the modal method with effective indices of the modes for TE/TM polarization. Holographic recording technology and inductively coupled plasma etching are employed to fabricate the fused-silica PBS grating. Experimental results of diffraction efficiencies approaching 80% for a TE-polarized wave in the -1st order and more than 85% for a TM-polarized wave in the 0th order were obtained at a wavelength of 1550 nm. Because of its compact structure and simple fabrication process, which is suitable for mass reproduction, a deep-etched fused-silica grating as a PBS should be a useful device for practical applications.
"The beam splitter, as a basic device in nanophotonics, has attractive application prospects in photonic integration, laser splitting   and interferometers  . Besides conventional beam splitters, photonic crystal splitters are widely studied. "
[Show abstract][Hide abstract] ABSTRACT: We report on a set of metamaterials composed of combined metallodielectric films as regards beam splitting use. The energy flow distributions of the structures are investigated by using the finite element method. It is found that the beams split and propagate along the direction normal to the films. After propagation to the far field, the resolution of the beams is about a sixth of the wavelength. Two-beam symmetrical and non-symmetrical splitting and also multi-beam splitting are obtained by changing the structures.
Journal of optics 01/2012; 14(1):015103. DOI:10.1088/2040-8978/14/1/015103 · 2.06 Impact Factor
"with the reverse case where the TE-and TM-polarized waves are diffracted in the –1st and 0th orders, respectively. Different effective indices will be excited for the polarization in the 0th order, which cause different tendencies of diffraction efficiencies compared with references  and  "
[Show abstract][Hide abstract] ABSTRACT: We describe high-density deep-etched fused-silica transmission polarizing beam splitter (PBS) gratings and their simple physical explanation. Optimized numerical results of the grating depth and period are given using the rigorous coupled-wave analysis in order to achieve high extinction ratio and efficiency for the usual laser wavelengths 351, 441.6, 532, 632.8, 800, and 1053 nm. The physical mechanism of such a PBS grating can be well explained with the effective indices of the modes for TE/TM polarization, which is a useful extension of the modal method for different structures reported in this paper. Compared with the work of Clausnitzer et al., fused-silica gratings can work as PBSs for not only the special duty cycle of 0.51 but also the usual duty cycle of 0.50. These numerical results and simple physical explanation provide a useful guideline for the design of a PBS grating.
[Show abstract][Hide abstract] ABSTRACT: In this paper, we propose a broadband compact polarizing beam splitter (PBS) constructed by only a single layer subwavelength asymmetric profile grating. The properties of the grating PBS are investigated by rigorous coupled-wave analysis. It is shown that, over a broadband spectrum of 1.53–1.62 µm, the grating PBS demonstrates high diffraction efficiencies (>97%) with extinction ratio (ER) greater than 16 dB and a comparatively wide angular bandwidth (about 8°). Effects of deviation from the design parameters on the performance of the grating PBS are also presented.
Journal of optics 11/2009; 12(1):015703. DOI:10.1088/2040-8978/12/1/015703 · 2.06 Impact Factor
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