<div style="text-align:justify;"> We developed a Bessel-beam photoacoustic microscopical simulation platform by using the k-Wave: MATLAB toolbox. The simulation platform uses the ring slit method to ge...<div style="text-align:justify;"> We developed a Bessel-beam photoacoustic microscopical simulation platform by using the k-Wave: MATLAB toolbox. The simulation platform uses the ring slit method to generate Bessel beam. By controlling the inner and outer radius of the ring slit, the depth-of-field (DoF) of Bessel beam can be controlled. And the large volumetric image is obtained by point scanning. The simulation experiments on blood vessels were carried out to demonstrate the feasibility of the simulation platform. This simulation work can be used as an auxiliary tool for the research of Bessel-beam photoacoustic microscopy. </div>展开更多
A simple and repeatable method to fabricate high-aspect-ratio （HAR） and high-quality microgrooves in silica is reported. The method consists of two steps： （I） formation of laser-modified regions by femtosecond Be...A simple and repeatable method to fabricate high-aspect-ratio （HAR） and high-quality microgrooves in silica is reported. The method consists of two steps： （I） formation of laser-modified regions by femtosecond Bessel beam irradiation, and （2） removing laser-modified regions through HF etching. Uniform, straight microgrooves can be fabricated and the highest aspect ratio that can be reached is -52. The phenomenon is attributed to the uniform energy distribution in the long propagation distance, which leads to the long and uniform laser-modified regions and subsequent HF acid etching of laser-modified regions with high selectivity. This method will have potential applications in fabrication of HAR microgrooves in transparent materials.展开更多
文摘<div style="text-align:justify;"> We developed a Bessel-beam photoacoustic microscopical simulation platform by using the k-Wave: MATLAB toolbox. The simulation platform uses the ring slit method to generate Bessel beam. By controlling the inner and outer radius of the ring slit, the depth-of-field (DoF) of Bessel beam can be controlled. And the large volumetric image is obtained by point scanning. The simulation experiments on blood vessels were carried out to demonstrate the feasibility of the simulation platform. This simulation work can be used as an auxiliary tool for the research of Bessel-beam photoacoustic microscopy. </div>
基金supported by the National 973 Program of China(No.2011CB013000)the National Natural Science Foundation of China(Nos.91323301 and 51305030)
文摘A simple and repeatable method to fabricate high-aspect-ratio （HAR） and high-quality microgrooves in silica is reported. The method consists of two steps： （I） formation of laser-modified regions by femtosecond Bessel beam irradiation, and （2） removing laser-modified regions through HF etching. Uniform, straight microgrooves can be fabricated and the highest aspect ratio that can be reached is -52. The phenomenon is attributed to the uniform energy distribution in the long propagation distance, which leads to the long and uniform laser-modified regions and subsequent HF acid etching of laser-modified regions with high selectivity. This method will have potential applications in fabrication of HAR microgrooves in transparent materials.
