18 February 2011 Guided-mode resonance in tunable orthogonal grating
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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.
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Zhenhua Wang, Zhenhua Wang, Yonggang Wu, Yonggang Wu, Zihuan Xia, Zihuan Xia, Naibo Chen, Naibo Chen, Leijie Ling, Leijie Ling, Heyun Wu, Heyun Wu, Gang Lv, 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); doi: 10.1117/12.887614; https://doi.org/10.1117/12.887614
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