Abstract
This paper presents split-ring resonator-based strain sensors designed and characterized for glaucoma detection application. The geometry of the sensor is optimized such that it can be embedded in a contact lens. Silver conductive paint is to form the sensors realized on flexible substrates made of cellulose acetate and latex rubber. The devices are excited and interrogated using a pair of monopole antennas and the characteristics of devices with different curvature profiles are obtained. The sensitivity of the device, i.e. the change in resonant frequency for a unit change in radius of curvature, on acetate film is calculated as -4.73 MHz/mm and the sensitivity of the device on latex is 33.2 MHz/mm. The results indicate that the demonstrated device is suitable for glaucoma diagnosis.
Highlights
Metamaterials exhibit electromagnetic properties, which are not present in ordinary materials, such as negative values of electric permittivity and magnetic permeability, simultaneously [1]
The resonant frequency of the device strongly depends on the geometry of the ring and any deviation in geometry due to external strain applied to the device results in change in resonant frequency of the resonator
We demonstrate the feasibility of detecting glaucoma using split-ring resonators (SRRs) sensors realized on flexible substrates that can be integrated to contact lenses
Summary
Metamaterials exhibit electromagnetic properties, which are not present in ordinary materials, such as negative values of electric permittivity and magnetic permeability, simultaneously [1]. A conventional SRR is a ring with a split, which is made of a preferably high-conductivity metal, and is fabricated on a dielectric substrate In addition to their favorable electromagnetic characteristics, the SRR devices can be realized in a simple and cost-effective manner. Glaucoma is an eye disease, which may damage the optic nerves and leads to vision loss Even though it might be caused by different factors, in most of the patients, it is caused by the increase of intraocular pressure and might eventually cause irreversible blindness. It is possible to monitor the progress of the disease in noninvasive and continuous manner using this approach These sensors are electrically active and require application of electrical signals in the contact lens during operation. We describe an electrically passive, wireless and low cost sensor to measure intraocular pressure by placing an SRR on top of contact lenses. This study suggests that SRR-based sensors are promising for the diagnosis of glaucoma
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