Whispering Gallery Mode microresonators are suitable for biosensing applications as they exhibit large Quality factors (Q) capable of sensing single nanoparticles, while also showcasing a dramatically reduced footprint compared to standard optical sensing techniques. The presence of a biological analyte on the microresonator’s surface results in a small change in the resonator’s overall diameter and refractive index. This induces a shift in resonant properties such as the center wavelength, the linewidth, and the amplitude, which can be measured in real time. In this paper we will discuss details of our optical sensing technique. We describe our microsphere and tapered fiber fabrication processes, we provide evidence of an effective biofunctionalization procedure, and we present spectral data from real-time biosensing.
Journal: TechConnect Briefs
Volume: TechConnect Briefs 2021
Published: October 18, 2021
Pages: 196 - 199
Industry sector: Sensors, MEMS, Electronics
Topics: Nanoelectronics, Sensors - Chemical, Physical & Bio