Fabry-Pérot optical sensor and portable detector for monitoring high-resolution ocular hemodynamics

A Compact Optical Pressure Measurement System for Acquiring Intraocular Pressure and Ocular Pulse

Frequent and accurate monitoring of intraocular pressure is an important aspect of glaucoma management and is central to timely therapeutic intervention and treatment optimization. Intraocular pressure is known to fluctuate not only throughout the day, but also as a function of the heart rate. This pulsatory pressure change behavior is known as the ocular pulse. In this study, we report on the measurement of the ocular pulse profile using a miniaturized intraocular pressure sensor implanted in the eye of a New Zealand White rabbit. The pressure sensor is based on the principle of interferometry and does not require an internal power source. The ocular pulse variation has been measured up to 5 Hz with an accuracy of +/- 0.15 mmHg using both a DSLR reader and a handheld smartphone reader.

Surface-plasmon-coupled optical force sensors based on metal-insulator-metal metamaterials with movable air gap

We proposed surface-plasmon-coupled optical force sensors based on metal–insulator–metal (MIM) metamaterials with a movable air gap as an insulator layer. The MIM metamaterial was composed of an air gap sandwiched by a metal nanodot array and a metal diaphragm, the resonant wavelength of which was red-shifted when the air gap was narrowed by applying a normal force. We designed and fabricated a prototype of the proposed sensor and confirmed that the MIM metamaterial could be used as a force sensor with larger sensitivity than a force sensor based on Fabry-Pérot interferometer (FPI).