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22 February 2018 Photonic molecules for application in silicon-on-insulator optical sensors
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Proceedings Volume 10537, Silicon Photonics XIII; 105371B (2018)
Event: SPIE OPTO, 2018, San Francisco, California, United States
Optical sensors based on integrated photonics have experienced impressive advancements in the past few decades and represent one of the main sensing solutions in many areas including environmental sensing and medical diagnostics. In this context, optical microcavities are extensively employed as refractive index (RI) sensors, providing sharp optical resonances that allow the detection of very small variations in the surrounding RI. With increased sensitivity, however, the device is subjected to environmental perturbations that can also change the RI, such as temperature variations, and therefore compromise their reliability. In this work, we present the concept and experimental realization of a photonic sensor based on coupled microcavities or Photonic Molecules (PM) in which only one cavity is exposed to the sensing solution, allowing a differential measurement of the RI change. The device consists of an exposed 5-μm radius microdisk resonator coupled to an external clad microring resonator fabricated on silicon-on-insulator (SOI) platform. This design allows good sensitivity (26 nm/RIU) for transverse electrical mode (TE-mode) in a compact footprint (40 × 40 μm2), representing a good solution for real-life applications in which measurement conditions are not easily controllable.
© (2018) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
Luis A. M. Barea, Mario C. M. M. Souza, Andre L. Moras, Alvaro R. G. Catellan, Giuseppe A. Cirino, Antonio A. G. Von Zuben, Jose W. M. Bassani, and Newton C. Frateschi "Photonic molecules for application in silicon-on-insulator optical sensors", Proc. SPIE 10537, Silicon Photonics XIII, 105371B (22 February 2018);

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