The fast advances in research of integrated silicon photonic and optical microcavities are collaborating for a rapid increase in the number of devices with important features such as reduced size and easy integration with the standard Complementary Metal-Oxide-Semiconductor (CMOS) technology and with other devices present in a chip. Consequently, the applications of these devices are also increasing rapidly, reaching areas of high scientific, technologic and strategic interest. In this context, the optical sensors based on microcavities coupled to waveguides are showing up with applications in significant areas such as physics, biology, chemicals and medicine. However, these sensors still have fundamental limitations like the requirement to have simultaneously high quality factor (Q) as well as long free spectral range (FSR) in microcavities with reduced sizes. In this respect, the purpose of this work is to design, fabricate and characterize optical sensors based on Photonic Molecules (PMs) in Silicon-on-Insulator (SOI) platforms. These PMs are photonic structures formed by electromagnetic coupling of two or more optical microcavities and their combination with the SOI platform will make it possible to break the fundamental constraint between Q, FSR and the size of the cavities, allowing optical sensors to be free from the limitations that recent optical sensors based on microcavities face.
News published in Agência FAPESP Newsletter about the scholarship: