5 March 2018 Graphene-based ultrasonic detector for photoacoustic imaging
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Proceedings Volume 10710, Young Scientists Forum 2017; 1071032 (2018) https://doi.org/10.1117/12.2317598
Event: Young Scientists Forum 2017, 2017, Shanghai, China
Abstract
Taking advantage of optical absorption imaging contrast, photoacoustic imaging technology is able to map the volumetric distribution of the optical absorption properties within biological tissues. Unfortunately, traditional piezoceramics-based transducers used in most photoacoustic imaging setups have inadequate frequency response, resulting in both poor depth resolution and inaccurate quantification of the optical absorption information. Instead of the piezoelectric ultrasonic transducer, we develop a graphene-based optical sensor for detecting photoacoustic pressure. The refractive index in the coupling medium is modulated due to photoacoustic pressure perturbation, which creates the variation of the polarization-sensitive optical absorption property of the graphene. As a result, the photoacoustic detection is realized through recording the reflectance intensity difference of polarization light. The graphene-based detector process an estimated noise-equivalentpressure (NEP) sensitivity of ~ 550 Pa over 20-MHz bandwidth with a nearby linear pressure response from 11.0 kPa to 53.0 kPa. Further, a graphene-based photoacoustic microscopy is built, and non-invasively reveals the microvascular anatomy in mouse ears label-freely.
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Fan Yang, Wei Song, Chonglei Zhang, Hui Fang, Changjun Min, Xiaocong Yuan, "Graphene-based ultrasonic detector for photoacoustic imaging", Proc. SPIE 10710, Young Scientists Forum 2017, 1071032 (5 March 2018); doi: 10.1117/12.2317598; https://doi.org/10.1117/12.2317598
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