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Proceedings Paper

Guided-mode resonance in tunable orthogonal grating
Author(s): Zhenhua Wang; Yonggang Wu; Zihuan Xia; Naibo Chen; Leijie Ling; Heyun Wu; Gang Lv
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Paper 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.

Paper Details

Date Published: 18 February 2011
PDF: 4 pages
Proc. SPIE 7995, Seventh International Conference on Thin Film Physics and Applications, 799517 (18 February 2011); doi: 10.1117/12.887614
Show Author Affiliations
Zhenhua Wang, Tongji Univ. (China)
Yonggang Wu, Tongji Univ. (China)
Zihuan Xia, Tongji Univ. (China)
Naibo Chen, Tongji Univ. (China)
Leijie Ling, Tongji Univ. (China)
Heyun Wu, Tongji Univ. (China)
Gang Lv, Tongji Univ. (China)


Published in SPIE Proceedings Vol. 7995:
Seventh International Conference on Thin Film Physics and Applications
Junhao Chu; Zhanshan Wang, Editor(s)

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