Integrated photonic biosensors are capable of detecting trace amounts of biochemical substances without time-consuming labeling steps [1]. Ring resonators and Mach-Zehnder interferometers (MZI) are among the most widely used sensor architectures. The latter can operate with a simple, fixed-wavelength source and have recently shown state-of-the-art limit of detections (LOD) (10−7 108 RIU) [2] by using the coherent phase read-out illustrated in Fig. 1(a), overcoming sensitivity fading and directional ambiguity [3]. Sensors using resonant structures often require a wavelength-swept source or broadband source combined with a spectrum analyzer [4]. However, they can also be interrogated with a coherent detection scheme and a fixed wavelength source, shown in Fig. 1(b), making them especially suited for cost sensitive point-of-care devices.

© 2019 IEEE

PDF Article


You do not have subscription access to this journal. Citation lists with outbound citation links are available to subscribers only. You may subscribe either as an OSA member, or as an authorized user of your institution.

Contact your librarian or system administrator
Login to access OSA Member Subscription