Development of tunable Fabry-Pérot polymer film sensors for parellelised photoacoustic signal acquisition (Conference Presentation)
Development of tunable Fabry-Pérot polymer film sensors for parellelised photoacoustic signal acquisition (Conference Presentation)
复制标题
开发用于并行光声信号采集的可调谐法布里-珀罗聚合物薄膜传感器（会议演示）
DOI：
10.1117/12.2290409
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发表时间：
2018
期刊：
影响因子：
--
通讯作者：
Jan Laufer
中科院分区：
文献类型：
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作者：
Claus Villringer;Taravat Saeb Gilani;Sara Gehauf;Clemens Wiedenhöft;Patrick Steglich;Silvio Pulwer;Maria Richetta;Sigurd Schrader;Jan Laufer
FP聚合物薄膜传感器具有元件尺寸小、声灵敏度高、透明和平坦的频率响应特性，能够在反向模式下实现高分辨率3D光声成像。然而，与并行化的压电探测器阵列相比，传统的光栅扫描查询可能导致数据采集缓慢（3D图像需要几分钟）。为了解决这一限制，研究了使用基于相机的FP传感器读出的并行化。这种方法要求聚合物隔离剂的光学厚度在扫描区域内足够均匀，以获得所有活性元素的高声学灵敏度。由于具有足够厚度均匀性的无源聚合物层的沉积具有挑战性，因此研究了电光（EO）或压电（PE）可调聚合物膜间隔片的使用。间隔片夹在两个介电镜和透明电极之间，形成FP传感器。在这项工作中，研究了由嵌入PMMA基质的EO发色团（2-甲基-4-硝基苯胺）和热蒸发PE膜间隔剂（PVDF）组成的自旋涂层主客系统。两个系统都使用电晕放电进行电极化。确定了光传递函数、600 ~ 1100nm激发通带的透射光谱和FP传感器的调谐范围。此外，还演示了对PA波的检测。可调FP传感器与基于相机的查询技术相结合，有可能提供以秒为数量级的3D图像采集时间。
Fabry-Pérot (FP) polymer film sensors exhibit small element sizes, high acoustic sensitivity, transparency and flat frequency response to enable high resolution 3D photoacoustic (PA) imaging in backward mode. However, conventional raster scan interrogation can result in slow data acquisition (several min for 3D images) compared to parallelized piezoelectric detector arrays. To address this limitation, parallelization using a camera-based readout of FP sensors is investigated. This approach requires the optical thickness of the polymer spacer to be sufficiently uniform over the scan area to obtain high acoustic sensitivity for all active elements. Since the deposition of passive polymer layers with sufficient homogeneity of thickness is challenging, the use of electro-optically (EO) or piezoelectric (PE) tunable polymer film spacers is investigated. The spacers are sandwiched between two dielectric mirrors and transparent electrodes to form an FP sensor. In this work, spin coated guest-host systems consisting of EO chromophores (2-methyl-4-nitroaniline) embedded in a PMMA matrix, and thermally evaporated PE film spacers (PVDF) were examined. Both systems were electrically poled using a corona discharge. The optical transfer function, the transmission spectrum of the excitation passband from 600 nm to 1100 nm and the tuning range of the FP sensors were determined. Furthermore, the detection of PA waves was demonstrated. Tunable FP sensors in conjunction with camera-based interrogation techniques have the potential to provide 3D image acquisition times on the order of seconds.