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5 March 2021 Ultrasound detection aided by bound states in the continuum
Eric Y. Zhu, Li Qian, Ofer Levi
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Proceedings Volume 11642, Photons Plus Ultrasound: Imaging and Sensing 2021; 1164221 (2021) https://doi.org/10.1117/12.2579094
Event: SPIE BiOS, 2021, Online Only
Abstract
We detail the design for a better photonic-crystal slab (PCS) based sensor for ultrasound sensing. The sensing mechanism relies upon the sensitivity S of the optical resonance of the PCS to the index of the surrounding medium, the quality factor Q of the resonance, as well as the surrounding medium’s photoelastic coefficient. Traditionally, the interplay between S and Q in PCS devices means that increasing one will cause a decrease in the other. Here, we show that the use of so-called bound states in the continuum (BIC)-based resonance allow for a high Q (> 1e5) while maintaining a nominal S (~ 350 nm/RIU). We anticipate using BIC-based PCS sensors to have a 100x improvement in the ultrasound sensitivity over previous PCS devices.
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Eric Y. Zhu, Li Qian, and Ofer Levi "Ultrasound detection aided by bound states in the continuum", Proc. SPIE 11642, Photons Plus Ultrasound: Imaging and Sensing 2021, 1164221 (5 March 2021); https://doi.org/10.1117/12.2579094
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KEYWORDS
Ultrasonography
Sensors
Photonic crystals
Optical sensors
Photoelasticity
Product engineering
Water
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