Opt Lett. 2022 Jun 1;47(11):2895-2898. doi: 10.1364/OL.458383.
We introduce a method to extract the photoacoustic (PA) signal from a contrast reduction of the interference spectrum acquired by spectral domain optical coherence tomography (SDOCT). This all-optical detection is achieved in a noncontact manner directly on the water surface covered on the sample by using its specular reflection. During SDOCT exposure, the phase of the interference spectrum keeps shaking according to the water surface vibration induced by PA excitation. This results in an interference contrast reduction which is quantified by a fast Fourier transform (FFT) for PA imaging. A tungsten filament, asparagus fern leaf, and mouse auricle are imaged to demonstrate the method.
我们介绍了一种从光谱域光相干断层扫描（SDOCT）获得的干涉光谱对比度降低中提取光声（PA）信号的方法。这种全光学检测是通过使用样品表面上覆盖的水的镜面反射，以非接触的方式直接在水面上实现的。在 SDOCT 曝光期间，干涉光谱的相位根据 PA 激发引起的水面振动不断晃动。这导致干涉对比度降低，通过快速傅里叶变换（FFT）进行 PA 成像进行量化。我们使用钨灯丝、羊齿蕨叶和小鼠耳廓进行成像以演示该方法。
