Abstract
In this investigation, we report the study of an optical device for the measurement of hydrostatic pressure in fluids. The device studied is a sensor based on a dielectric optical resonator in the form of a capillary that confines the light in its interior through the phenomenon of total internal reflection. In the analytical study of the sensor, the excitation of the azimuthal modes WGMs inside the resonant cavity is considered, so that their sensitivity to changes in the hydrostatic pressure was analyzed as a function of the displacement of wavelengths of resonances in the cavity.
Highlights
Optical microresonators are optical devices that are indispensable in circuits of integrated optics, which have applications in different areas of science and engineering
The cylindrical optical microcavities that have been made using different types of materials, experience a series of resonances commonly known as Whispering Gallery modes WGMs, which are characteristic of the cavities that have rotational symmetry and can be explained through the phenomenon of total internal reflection occurring within these cavities when they are excited through an external source
To perform the theoretical study of the sensitivity of a capillary microresonator for the measurement of hydrostatic pressure in microfluidics, the cavity is considered as a system composed of three layers with different refractive indexes and the WGMs modes are excited in the intermediate layer to the interior of the structure because in that region the light experiences the phenomenon of total internal reflection between the inner and outer interface of the microcavity
Summary
Optical microresonators are optical devices that are indispensable in circuits of integrated optics, which have applications in different areas of science and engineering These optical microresonators have been manufactured with different morphologies in the form of capillaries [1,2,3,4], discs [5], rings [6 -8], toroids [9], spheres [10], bubbles [11], bottles [12], etc, using different materials such as silicon, silica, polymers, with applications in areas such as biology [13], medicine [4], physics [14], chemistry [10] and in the area of sensors for the measurement of temperature [15], humidity [12], refractive index [16] and some other physical variables of interest [6]. We have analyzed the sensitivity of a capillary resonator for the measurement of hydrostatic pressure of microfluidics, analyzing the propagation of WGMs modes and the spectral shifts in the resonance wavelengths of the cavity in response to changes in hydrostatic pressure within the resonator
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