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Proceedings Article

Guided-mode resonance in tunable orthogonal grating

[+] Author Affiliations
Zhenhua Wang, Yonggang Wu, Zihuan Xia, Naibo Chen, Leijie Ling, Heyun Wu, Gang Lv

Tongji Univ. (China)

Proc. SPIE 7995, Seventh International Conference on Thin Film Physics and Applications, 799517 (February 17, 2011); doi:10.1117/12.887614
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From Conference Volume 7995

  • Seventh International Conference on Thin Film Physics and Applications
  • Junhao Chu; Zhanshan Wang
  • Shanghai, China | September 24, 2010

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.

© (2010) COPYRIGHT SPIE--The International Society for Optical Engineering. Downloading of the abstract is permitted for personal use only.
Citation

Zhenhua Wang ; Yonggang Wu ; Zihuan Xia ; Naibo Chen ; Leijie Ling, et al.
"Guided-mode resonance in tunable orthogonal grating", Proc. SPIE 7995, Seventh International Conference on Thin Film Physics and Applications, 799517 (February 17, 2011); doi:10.1117/12.887614; http://dx.doi.org/10.1117/12.887614


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