Broadband graphene-based photoacoustic microscopy with high sensitivity. | |
Zhu, Siwei; Yuan, Xiaocong; Yang, Fan; Song, Wei; Zhang, Chonglei; Min, Changjun; Fang, Hui; Du, Luping; Wu, Peng; Zheng, Wei | |
刊名 | NANOSCALE |
2018 | |
文献子类 | 期刊论文 |
英文摘要 | Photoacoustic microscopy (PAM) enables the measurement of properties associated with optical absorption within tissues and complements sophisticated technologies employing optical microscopy. An inadequate frequency response as determined by a piezoelectric ultrasonic transducer results, however, in poor depth resolution and inaccurate measurements of the coefficients of optical absorption. We developed a PAM system configured as an attenuated total reflectance sensor with a ten-layer graphene film sandwiched between a prism and water (the coupling medium) for photoacoustic (PA) wave detection. Transients of the PA pressure cause perturbations in the refractive index of the water thereby changing the polarization-dependent absorption of the graphene film. The signal in PA detection involves recording the difference in the temporal-varying reflectance intensity between the two orthogonally polarized probe beams. The graphene-based sensor has an estimated noise-equivalent-pressure sensitivity of similar to 550 Pa over an approximately linear pressure response from 11.0 kPa to 55.0 kPa. Moreover, it enables a much broader PA bandwidth detection of up to similar to 150 MHz, primarily dominated by a highly localized evanescent field. From the strong optical absorption of inherent hemoglobin, in vivo label-free PAM imaging provided a three-dimensional viewing of the microvasculature of a mouse ear. These results suggest great potential for graphene-based PAM in biomedical investigations, such as microcirculation studies. |
URL标识 | 查看原文 |
语种 | 英语 |
内容类型 | 期刊论文 |
源URL | [http://ir.siat.ac.cn:8080/handle/172644/14211] |
专题 | 深圳先进技术研究院_医工所 |
推荐引用方式 GB/T 7714 | Zhu, Siwei,Yuan, Xiaocong,Yang, Fan,et al. Broadband graphene-based photoacoustic microscopy with high sensitivity.[J]. NANOSCALE,2018. |
APA | Zhu, Siwei.,Yuan, Xiaocong.,Yang, Fan.,Song, Wei.,Zhang, Chonglei.,...&Li, Changhui.(2018).Broadband graphene-based photoacoustic microscopy with high sensitivity..NANOSCALE. |
MLA | Zhu, Siwei,et al."Broadband graphene-based photoacoustic microscopy with high sensitivity.".NANOSCALE (2018). |
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