论文标题
低增生光电探测器的同源时域声学成像
Homodyne Time-Domain Acousto-Optic Imaging for Low-Gain Photodetectors
论文作者
论文摘要
声学成像（AOI）是一种混合成像模态，能够通过局部超声调制的扩散光子的局部超声调制来映射深层组织中的光通量速率。由于调制光子的强度相对较低，因此AOI系统通常依赖于高增益的光电探测器，例如光电倍增管（PMTS），由于大小和成本而限制可伸缩性，并且可能会显着增加检测到的信号中由于低量子产率或增益噪声而导致的相对射击。在这封信中，我们开发了一种同伴AOI方案，其中调制光子通过干扰参考梁而放大，从而可以使用低增益光电探测器检测。我们通过硅光电二极管实验证明了我们的方法，与基于PMT的设置相比，SNR的改善4倍。
Acousto-optics imaging (AOI) is a hybrid imaging modality that is capable of mapping the light fluence rate in deep tissue by local ultrasound modulation of the diffused photons. Since the intensity of the modulated photons is relatively low, AOI systems often rely on high-gain photodetectors, e.g. photomultiplier tubes (PMTs), which limit scalability due to size and cost and may significantly increase the relative shot-noise in the detected signal due to low quantum yields or gain noise. In this Letter, we have developed a homodyne AOI scheme in which the modulated photons are amplified by interference with a reference beam, enabling their detection with low-gain photodetectors. We experimentally demonstrate our approach with a silicon photodiode, achieving over a 4-fold improvement in SNR in comparison to a PMT-based setup.
