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We demonstrate narrow band optical filter like frequency response with full width half maximum (FWHM) of nearly (1.75 ± 0.25) Hz in fluorescein doped boric acid glass films [10−4 M], using modulated optical phase conjugation and a nearly non-degenerate four wave mixing technique. Modulated optical phase conjugation signals are described in the limit of a weak probe and relatively strong pump beams. Both pump beams are of nearly equal intensity at a wavelength of 514.5 nm from a continuous-wave Ar+ laser. The probe beam frequency has been detuned with a ramp signal using a piezo electric mirror. 相似文献
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Hydrostatic stresses in Si substrates near edges of Pt/PZT microstructures used in pyrosensor fabrication have been predicted theoretically by finite element (FE) calculations. Within the absorption limited depth zone from which Raman radiation can be detected the substrate stress varies considerably. The characteristic lateral length scale of the average stress profile perpendicular to the film edges is less than 50 μm resulting from contributions of different depth. These stresses could be measured by spatially resolved Raman spectroscopy with an accuracy of 1‐2 μm.The values of the film stress of Pt and PZT have been estimated by fitting the FE models to the measured curves of the stress distribution in the Si substrate. 相似文献
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建立了音叉-探针-样品系统机械振动方程和电子学振荡方程,并得到其振动特性的解析表达式,进一步得到等效电路的电子学特性,进而系统分析了压电石英音叉的控制探针与样品(T-S)间距离的作用机制及其机电特性。为探针-样品间距控制方法提供了依据。 相似文献
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Jasmine C. Gomez Nicholas S. Vishnosky Spencer T. Kim Steluta A. Dinca Eric B. Finkelstein Rachel C. Steinhardt 《Advanced functional materials》2023,33(24):2214893
A novel soft actuator is designed, fabricated, and optimized for applied use in soft robotics and biomedical applications. The soft actuator is powered by the expansion and contraction of a graphene-containing and encased liquid marble using the photothermal effect. Unfortunately, conventional liquid marbles are found to be too fragile and prone to cracking and failure for such applications. After experimentation, it is possible to remedy this problem by synthesizing liquid marbles encased with polymeric shells–polymerized in situ–for added mechanical strength and robustness. These marbles are shown to have intrinsic photothermal activity. They are then situated in bimorph-type soft actuators where one side of the actuator has a dramatically different Young's modulus than the other, leading to directional actuation which is successfully demonstrated in multistep walking soft robots. The soft actuators are shown to successfully activate the mechanosensitive Piezo protein in a transfected human cell line with high effectiveness and no toxicity. Overall, the liquid marble-powered soft actuators described here represent a new soft actuation methodology and a novel tool for mechanobiological studies, such as stem cell fate and organoid differentiation. 相似文献
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Piezo‐Phototronic Effect on Performance Enhancement of Anisotype and Isotype Heterojunction Photodiodes 下载免费PDF全文
The piezo‐phototronic effect is confirmed as a promising methodology to optimize the performance of optoelectronic devices. However, not only positive effects, but also negative effects may be produced in some types of photodiodes (PDs) by the piezo‐phototronic effect, resulting in the restriction of the PDs' photoresponse performance enhancement. In order to obtain the largest possible photoresponse performance enhancement, it is essential to investigate how the piezo‐phototronic effect influences the photoresponse performance of PDs with different device configurations and structures. Here, the piezo‐phototronic effect on the photoresponse performance enhancement of anisotype (p‐Si/n‐ZnO) and isotype (n‐Si/n‐ZnO) heterojunction PDs is thoroughly investigated. The experimental results show that the piezo‐phototronic effect induced improvement of the p‐Si/n‐ZnO heterojunction PD is much larger than that of the n‐Si/n‐ZnO heterojunction PD. The energy band diagrams under compressive strains are carefully analyzed, revealing that two positive effects are introduced to the p‐Si/n‐ZnO heterojunction PD, whereas one positive and two negative effects are introduced to the n‐Si/n‐ZnO heterojunction PD by the piezo‐phototronic effect. This work presents an in‐depth understanding about the piezo‐phototronic effect on the photoresponse performances of PDs with different device configurations and structures. 相似文献
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