Abstract
The optical characteristics of a simple, planar, single layer, dielectric Mg-based guided mode resonance filter (GMRF) were investigated by means of rigorous-coupled wave analysis (RCWA). This filter has great potential for real-life applications, especially as bio- and environmental sensors. The structure of the proposed sensor is compact, and all of its layers can be grown in a single process. In this paper, we present results on the design of a water pollution sensor in the violet region of the visible spectrum. The spectral and angular sensitivities of the sensor for both the transverse electric (TE) and transverse magnetic (TM) polarization modes were estimated and compared for various regions in the violet spectrum. A spectral response characterized with a narrow bandwidth and low reflection side bands was realized by carrying out extensive parameter search and optimization. Optimal spectral and angular sensitivities were found for the sensor with a grating thickness of 100 nm in the TM polarized mode where we found them to be 100 nm and 40 degrees, per index refraction unit, respectively.
Highlights
The MgF2/magnesium oxide (MgO) combination used in our Mg-based guided mode resonance filter (GMRF) structure has been widely used in many scientific and technological applications
Optimal spectral and angular sensitivities were found for the sensor with a grating thickness of 100 nm in the transverse magnetic (TM) polarized mode where we found them to be 100 nm and 40 degrees, per index refraction unit, respectively
The MgF2/MgO combination used in our Mg-based guided mode resonance filter (GMRF) structure has been widely used in many scientific and technological applications
Summary
The MgF2/MgO combination used in our Mg-based guided mode resonance filter (GMRF) structure has been widely used in many scientific and technological applications. One related notable application is its usage as an insulating film-matrix for magnetic granules Fe50Co50 and Fe50Co50B20, leading to the large tunnel magneto-resistance effect that can be utilized for magnetic sensing [1]. When phase-matching conditions involving the wave vectors of the incident, reflected and transmitted radiations are met, externally propagating waves can be coupled into guided modes by the grating. These guided modes are “leaky” due to the modulation in the refractive index of the waveguide. This causes the guided modes to slowly leak out from the waveguide and recombine with the incident radiation to establish a resonance [3, 4]
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