Guided-mode resonance in tunable orthogonal grating

Zhenhua Wang; Yonggang Wu; Zihuan Xia; Naibo Chen; Leijie Ling; Heyun Wu; Gang Lv

doi:10.1117/12.887614

18 February 2011 Guided-mode resonance in tunable orthogonal grating

Zhenhua Wang, Yonggang Wu, Zihuan Xia, Naibo Chen, Leijie Ling, Heyun Wu, Gang Lv

Proceedings Volume 7995, Seventh International Conference on Thin Film Physics and Applications; 799517 (2011) https://doi.org/10.1117/12.887614
Event: Seventh International Conference on Thin Film Physics and Applications, 2010, Shanghai, China

Abstract

In this paper, we present a new tunable orthogonal grating consisting of two weakly modulated subwavelength gratings perpendicularly to one another. Using the rigorous coupled-wave analysis (RCWA), we calculate and analyze the characteristics of guided-mode resonance on incident angle for TE/TM polarization. We demonstrate that a wide range tunability of such structure accomplished with only a nanoscale variation of the spacing between the gratings. For a normally incident wave of both TE and TM polarization, the structure turns out the same spectrum and resonance peaks. A gap of reflection peaks is found, and electric field distributions manifest that this gap is due to the interaction between the leaky modes of TE₀-TE₀, TM₀-TM₀ or TE₀-TM₀. We investigate the reflection efficiency of TE/TM polarization as a function of the wavelength with the angle of incidence as a parameter. As incident angle increases, the separation of the resonances increases also. At the same time, some specific wavelengths are maintained.

Citation Download Citation

Zhenhua Wang, Yonggang Wu, Zihuan Xia, Naibo Chen, Leijie Ling, Heyun Wu, and Gang Lv "Guided-mode resonance in tunable orthogonal grating", Proc. SPIE 7995, Seventh International Conference on Thin Film Physics and Applications, 799517 (18 February 2011); https://doi.org/10.1117/12.887614

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KEYWORDS

Polarization

Diffraction gratings

Diffraction

Reflection

Refractive index

Waveguides

Modulation

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