Demirkiran Aytac, Karakuzu Agah, Erkol Hakan, Torun Hamdi, Unlu Mehmet B
Opt Express. 2018 Feb 19;26(4):4906-4919. doi: 10.1364/OE.26.004906.
This study presents a simulation-based analysis on the excitation of microcantilever in air using pulsed-laser-induced photoacoustic waves. A model was designed and coded to investigate the effects of consecutive photoacoustic waves, arising from a spherical light absorber illuminated by short laser pulses. The consecutiveness of the waves were adjusted with respect to the pulse repetition frequency of the laser to examine their cumulative effects on the oscillation of microcantilever. Using this approach, oscillation characteristics of two rectangular cantilevers with different resonant frequencies (16.9 kHz and 505.7 kHz) were investigated in the presence of the random oscillations. The results show that the effective responses of the microcantilevers to the consecutive photoacoustic waves provide steady-state oscillations, when the pulse repetition frequency matches to the fundamental resonant frequency or its lower harmonics. Another major finding is that being driven by the same photoacoustic pressure value, the high frequency cantilever tend to oscillate at higher amplitudes. Some of the issues emerging from these findings may find application area in atomic force microscopy actuation and photoacoustic signal detection.
本研究对空气中使用脉冲激光诱导光声波激发微悬臂梁进行了基于模拟的分析。设计并编写了一个模型，以研究由短激光脉冲照射的球形光吸收体产生的连续光声波的影响。相对于激光的脉冲重复频率调整波的连续性，以检查它们对微悬臂梁振荡的累积影响。使用这种方法，在存在随机振荡的情况下，研究了两个具有不同共振频率（16.9 kHz和505.7 kHz）的矩形悬臂梁的振荡特性。结果表明，当脉冲重复频率与基频共振频率或其较低谐波匹配时，微悬臂梁对连续光声波的有效响应提供稳态振荡。另一个主要发现是，在相同的光声压力值驱动下，高频悬臂梁倾向于以更高的振幅振荡。这些发现中出现的一些问题可能会在原子力显微镜驱动和光声信号检测中找到应用领域。
