Relationship between linewidth and electric field intensity of guide-mode resonance filter

In this paper, relationship between linewidth and maximum electric field intensity (MEFI) at resonance of guided-mode resonance filter (GMRF) is investigated. It is demonstrated that the linewidth will vary inversely with the MEFI as one of some of the parameters of the GMRF increasing (e.g. period, thickness, and filling factor of the grating in the GMRF and cover refractive index) and with others maintained. Also it is demonstrated that resonant wavelength will shift to longer wavelength as any one of the parameters of the GMRF increasing. Moreover, the changes of period and thickness of grating have good linear relation with wavelength shifting. This will be of interest for optical sensor systems. (C) 2011 Elsevier GmbH. All rights reserved.