A Novel Nano-Grating Structure of Polarizing Beam Splitters

We present a comprehensive analysis of physical evolution of nanograting formation based on an experiment performed with femtosecond pulses focused under moderate focusing conditions and where pulse energy is slowly increased as the focused beam is moved along the sample surface. The results demonstrate that nanograting inscription is initiated at the location of the maximum plasma density and evolves through local intensity side lobes, whose locations are self-regulated in a closed feedback loop, in agreement with the plasmonic model.

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Physical origin of nanograting formation on fused silica with femtosecond pulses

Liang

Vallée

2014

Applied Physics Letters

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Design of a Fused-Silica Subwavelength Polarizing Beam Splitter Grating Based on the Modal Method

Zhao

Yuan

Wang

et al. 2010

Chinese Phys. Lett.

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A polarizing beam splitter (PBS) design based on a fused-silica lamellar subwavelength transmission grating is demonstrated with the modal method, where TE-and TM-polarized waves are mainly diffracted in the −1 st and 0 th orders, respectively. The physical explanation of the grating diffraction is illustrated by the interference of the corresponding parts of the two propagating modes, which is very similar to a Mach-Zehnder interferometer. It is shown that diffraction efficients over 99% for a TM-polarized wave in the −1 st order and 90% for a TE-polarized wave in the 0 th order are obtained at the wavelength of 1.053 𝜇m. The polarization transmission extinction ratios are better than 33 dB and 51 dB for the order 0 th and the −1 st order, respectively. The splitting properties of the PBS grating designed by the modal method are in good agreement with the results simulated by the rigorous coupled wave analysis method.

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Optimal design of sub-wavelength metal rectangular gratings for polarizing beam splitter based on effective medium theory

et al. 2009

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A novel optimal design of sub-wavelength metal rectangular gratings for the polarizing beam splitter (PBS) is proposed. The method is based on effective medium theory and the method of designing single layer antireflection coating. The polarization performance of PBS is discussed by rigorous couple-wave analysis (RCWA) method at a wavelength of 1550 nm. The result shows that sub-wavelength metal rectangular grating is characterized by a high reflectivity, like metal films for TE polarization, and high transmissivity, like dielectric films for TM polarization. The optimal design accords well with the results simulated by RCWA method.

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A Novel Nano-Grating Structure of Polarizing Beam Splitters

Cited by 4 publications

References 9 publications

Physical origin of nanograting formation on fused silica with femtosecond pulses

Physical origin of nanograting formation on fused silica with femtosecond pulses

Design of a Fused-Silica Subwavelength Polarizing Beam Splitter Grating Based on the Modal Method

Optimal design of sub-wavelength metal rectangular gratings for polarizing beam splitter based on effective medium theory

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