Subwavelength acoustic imaging using kHz-GHz extraordinary transmission

我们展示了一种基于膜共振（MR）的基于超透射（ET）的扫描声学显微镜，其音频（高达20 kHz）范围（波长~1-10 mm）具有深亚波长（<lamba/30）分辨率。显微镜有一个直径约1厘米的塑料膜，工作在1000赫兹左右。我们确认可以进行15毫米距离的地形测量。对几种材料进行线性扫描，以确认λ /20的分辨率。我们已经开发了一个新的系统分析模型，目前正在准备将结果发表在期刊上。我们还在纳米级硅桥中对纵波的GHz ET进行了模拟，并证实了该原理在输入侧有凹槽的情况下是有效的。我们计算出最高可达250的传动效率，创下世界纪录。一篇期刊论文已经完成，我们正处于最后检查阶段，准备在2-3周内提交。

We have demonstrated an Extraordinary-Transmission (ET)-based scanning acoustic microscope based on membrane resonance (MR) in the audio (up to 20 kHz) range (wavelength ~1-10 mm) with deeply sub-wavelength (<lamba/30) resolution. The microscope has a plastic membrane of diameter around 1 cm working at around 1000 Hz. We confirmed operation for topography measurement up to 15 mm distance. Linear scans were made of several materials to confirm lambda/20 resolution. We have developed a new analytical model of this system and are preparing a journal publication of the results at the present time.We have also done simulations on GHz ET of longitudinal waves in nanoscale silicon bridges and confirmed the principle works with grooves at the input side. We have calculated the transmission efficiency to be a maximum of 250, a world record. A journal paper has been written and we are on the final check stage, ready for submission in around 2-3 weeks.