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Proceedings Paper

Photonic molecules for application in silicon-on-insulator optical sensors
Author(s): 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; Newton C. Frateschi
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Paper Abstract

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.

Paper Details

Date Published: 22 February 2018
PDF: 8 pages
Proc. SPIE 10537, Silicon Photonics XIII, 105371B (22 February 2018); doi: 10.1117/12.2287844
Show Author Affiliations
Luis A. M. Barea, Univ. Federal de São Carlos (Brazil)
Mario C. M. M. Souza, Univ. Estadual de Campinas (Brazil)
Andre L. Moras, Univ. Estadual de Campinas (Brazil)
Alvaro R. G. Catellan, Univ. Federal de São Carlos (Brazil)
Giuseppe A. Cirino, Univ. Federal de São Carlos (Brazil)
Antonio A. G. Von Zuben, Univ. Estadual de Campinas (Brazil)
Jose W. M. Bassani, Univ. Estadual de Campinas (Brazil)
Newton C. Frateschi, Univ. Estadual de Campinas (Brazil)

Published in SPIE Proceedings Vol. 10537:
Silicon Photonics XIII
Graham T. Reed; Andrew P. Knights, Editor(s)

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