Abstract
Guided-mode resonance strain sensors are planar binary gratings that have fixed resonance positions and quality factors decided by material properties and grating parameters. If one is restricted by material choices, the quality factor can only be improved by adjusting the grating parameters. We report a new method to improve quality factor by applying a slotting design rule to a grating design. We investigate this design rule by first providing a theoretical analysis on how it works and then applying it to a previously studied 2D solid-disc guided-mode resonance grating strain sensor design to create a new slotted-disc guided-mode resonance grating design. We then use finite element analysis to obtain reflection spectrum results that show the new design produces resonances with at least a 6-fold increase in quality factor over the original design and more axially-symmetric sensitivities. Lastly, we discuss the applicability of the slotting design rule to binary gratings in general as a means of improving grating performance while retaining both material and resonance position choices.
Highlights
IntroductionStrain sensing has numerous applications, from concrete structures [1] to biomechanics and robotics [2], in which the displacement of a deformable material under a force needs to measured.While there are several physical phenomena (piezoresistivity, piezoelectricity, capacitance) that can be used for measuring strain, of which piezoresistivity is currently the dominant form [3], a large number of optics-based strains sensors are being developed due to its smaller size, low power consumption, high sensitivity, large bandwidth, biocompatibility, and immunity to electromagnetic interference [4].The typical optics-based strain sensor is the fiber optic strain sensor, of which there are many variants, each of which exploit different optical phenomenon such as attenuation, fluorescence, luminescence, interference, to name a few [4]
Strain sensing has numerous applications, from concrete structures [1] to biomechanics and robotics [2], in which the displacement of a deformable material under a force needs to measured.While there are several physical phenomena that can be used for measuring strain, of which piezoresistivity is currently the dominant form [3], a large number of optics-based strains sensors are being developed due to its smaller size, low power consumption, high sensitivity, large bandwidth, biocompatibility, and immunity to electromagnetic interference [4].The typical optics-based strain sensor is the fiber optic strain sensor, of which there are many variants, each of which exploit different optical phenomenon such as attenuation, fluorescence, luminescence, interference, to name a few [4]
Grating design; Figure 6b presents the results for the slotted-disc Guided-mode resonance (GMR) grating design
Summary
Strain sensing has numerous applications, from concrete structures [1] to biomechanics and robotics [2], in which the displacement of a deformable material under a force needs to measured.While there are several physical phenomena (piezoresistivity, piezoelectricity, capacitance) that can be used for measuring strain, of which piezoresistivity is currently the dominant form [3], a large number of optics-based strains sensors are being developed due to its smaller size, low power consumption, high sensitivity, large bandwidth, biocompatibility, and immunity to electromagnetic interference [4].The typical optics-based strain sensor is the fiber optic strain sensor, of which there are many variants, each of which exploit different optical phenomenon such as attenuation, fluorescence, luminescence, interference, to name a few [4]. While there are several physical phenomena (piezoresistivity, piezoelectricity, capacitance) that can be used for measuring strain, of which piezoresistivity is currently the dominant form [3], a large number of optics-based strains sensors are being developed due to its smaller size, low power consumption, high sensitivity, large bandwidth, biocompatibility, and immunity to electromagnetic interference [4]. Guided-mode resonance (GMR) is a phenomenon that occurs when electromagnetic radiation incident upon a binary dielectric grating becomes coupled to the leaky (radiative) waveguide modes of that grating [5,6]. Given the wide range of fabrication feature sizes and a large selection of dielectric materials to choose from, GMR devices can be fabricated to operate over a variety of wavelength spectra that are of interest
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