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Sep. 2010

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Chinese Optics> 2010> 3(4): 348-352.

Wang Bo. Polarization-selectivity of high-density phase gratings[J]. Chinese Optics, 2010, 3(4): 348-352.

Citation:

Wang Bo. Polarization-selectivity of high-density phase gratings[J].Chinese Optics, 2010, 3(4): 348-352.

Wang Bo. Polarization-selectivity of high-density phase gratings[J]. Chinese Optics, 2010, 3(4): 348-352.

Citation:

Wang Bo. Polarization-selectivity of high-density phase gratings[J].Chinese Optics, 2010, 3(4): 348-352.

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Polarization-selectivity of high-density phase gratings

Wang Bo

School of Physics and Optoelectronic Engineering,Guangdong University of Technology,Guangzhou 510006,China

Received Date:11 Jan 2010
Rev Recd Date:13 Mar 2010
Publish Date:25 Aug 2010

Abstract

Abstract

Diffraction properties of high-density gratings are polarization-dependent, which are different from those of conventional gratings. For TE- and TM-polarized incident waves with a wavelength of 1 550 nm and a duty cycle of 0.5, diffraction efficiencies in the 0th and-1st orders are calculated using Rigorous Coupled-wave Analysis(RCWA). It indicates that more polarization-dependent characteristics are shown for the period 1 200 nm compared with 1 550 nm. Especially, with the period 890 nm, the diffraction efficiency of TE-polarized wave changes with grating depth sinusoidally, while the efficiency of TM-polarized wave which has polarization-selectivity is always concentrated on the 0th order. According to modal method, modes excited by the incident wave are investigated for different periods and the accumulated phase differences of the two modes with different effective indices are calculated when they propagate through the grating region. Moreover, diffraction efficiencies in the 0th and-1st orders are simulated based on two-beam interference. Experimental result shows that the numerical calculation result using RCWA coincides well with the theoretical predictions of modal method, which can explain the physical mechanism of polarization-selectivity of high-density phase gratings.
- high-density grating,
- Rigorous Coupled-wave Analysis(RCWA),
- modal method,
- polarization-selectivity

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References (1)

References

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