Abstract
A comparison of optical sensors’ characteristics based on guided-mode resonance has been carried out. It was considered a prism structure with a metal film, a metal grating on a metal substrate and a dielectric grating on a dielectric substrate. It is shown that the main characteristics are determined by the sensitivity of the constant propagation of the respective waveguides on a change in wavelength and a change in the refractive index of the tested medium. In addition, they depend on the full width at half maximum of the spectral or angular reflectance dependence. The corresponding analytical relationships obtained for the three types of sensors are almost the same. It is demonstrated that the ratio of the sensor spectral sensitivity on the resonance curve spectral width is equal to the ratio of the angular sensitivity on the angular width of the corresponding resonance curve for all three types of sensors.
Highlights
Optical sensors for measuring biological solutions’ refractive indices are mainly based on resonant excitation of the waveguide processes
It is demonstrated that the ratio of the sensor spectral sensitivity on the resonance curve spectral width is equal to the ratio of the angular sensitivity on the angular width of the corresponding resonance curve for all three types of sensors
The spectral sensitivity of the prism structure is much higher than the corresponding sensitivity of the metal grating on the metal substrate
Summary
Optical sensors for measuring biological solutions’ refractive indices are mainly based on resonant excitation of the waveguide processes. The analytical equations relating the parameters of the waveguide, the angle of incidence, the angular and spectral sensitivity of the sensor, and the relationship between the full widths at half maximum of the resonance spectral and angular dependences, will be obtained. These studies will show us what to expect from sensors based on planar waveguides. When the guided-mode resonance is excited in the grating structure, the following equation wavelength and the refractive indices of the layers form the waveguide; in particular, the refractive is satisfied [4]: index of the tested medium. Is accurate under plasmon–polariton resonance in the prism structure
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