In this paper, we propose an energy harvester that overcomes the bottleneck problem under ultralow-frequency rotational motion. The harvester consists of bistable dual piezoelectric energy harvesters (BD-PEH) with the magnetic plucking mechanism. The driving magnet is introduced to provide the magnetic plucking to BD-PEH. Therefore, the BD-PEH can operate at high-frequency vibrations across the potential well under ultralow-frequency rotation, which enhances energy harvesting efficiency. A numerical model of the harvester is developed, and the model results are in agreement with the experimental results. The effect of the depth of the potential well on the performance of the harvester is analyzed. The deeper the potential well, the higher the energy output, but it will reduce the bandwidth of the harvester. The experimental results show that the highest average power output is 0.81 mW at 1.2 Hz. In conclusion, the energy harvester proposed in this paper can generate enough energy to drive low-power electronic devices under ultralow-frequency rotational motion.
{"title":"An ultralow-frequency high-efficiency rotational energy harvester with bistability principle and magnetic plucking mechanism","authors":"Xiaobo Rui, Hang Li, Yu Zhang, Zhou Sha, Hao Feng, Zhoumo Zeng","doi":"10.1063/5.0235392","DOIUrl":"https://doi.org/10.1063/5.0235392","url":null,"abstract":"In this paper, we propose an energy harvester that overcomes the bottleneck problem under ultralow-frequency rotational motion. The harvester consists of bistable dual piezoelectric energy harvesters (BD-PEH) with the magnetic plucking mechanism. The driving magnet is introduced to provide the magnetic plucking to BD-PEH. Therefore, the BD-PEH can operate at high-frequency vibrations across the potential well under ultralow-frequency rotation, which enhances energy harvesting efficiency. A numerical model of the harvester is developed, and the model results are in agreement with the experimental results. The effect of the depth of the potential well on the performance of the harvester is analyzed. The deeper the potential well, the higher the energy output, but it will reduce the bandwidth of the harvester. The experimental results show that the highest average power output is 0.81 mW at 1.2 Hz. In conclusion, the energy harvester proposed in this paper can generate enough energy to drive low-power electronic devices under ultralow-frequency rotational motion.","PeriodicalId":8094,"journal":{"name":"Applied Physics Letters","volume":"41 1","pages":""},"PeriodicalIF":4.0,"publicationDate":"2024-11-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142599522","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Sebastiano Battisti, Giorgio De Simoni, Alessandro Braggio, Alessandro Paghi, Lucia Sorba, Francesco Giazotto
We are proposing a hybrid superconductor–semiconductor platform using indium arsenide (InAs) grown on an insulating layer of indium aluminum arsenide heterostructure (InAsOI) as an ideal candidate for coherent caloritronic devices. These devices aim to heat or cool electrons out of equilibrium with respect to the phonon degree of freedom. However, their performances are usually limited by the strength of the electron–phonon (e-ph) coupling and the associated power loss. Our work discusses the advantages of the InAsOI platform, which are based on the significantly low e-ph coupling measured compared to all-metallic state-of-the-art caloritronic devices. Our structure demonstrates values of the e-ph coupling constant up to two orders of magnitude smaller than typical values in metallic structures.
{"title":"Extremely weak sub-Kelvin electron–phonon coupling in InAs on Insulator","authors":"Sebastiano Battisti, Giorgio De Simoni, Alessandro Braggio, Alessandro Paghi, Lucia Sorba, Francesco Giazotto","doi":"10.1063/5.0225361","DOIUrl":"https://doi.org/10.1063/5.0225361","url":null,"abstract":"We are proposing a hybrid superconductor–semiconductor platform using indium arsenide (InAs) grown on an insulating layer of indium aluminum arsenide heterostructure (InAsOI) as an ideal candidate for coherent caloritronic devices. These devices aim to heat or cool electrons out of equilibrium with respect to the phonon degree of freedom. However, their performances are usually limited by the strength of the electron–phonon (e-ph) coupling and the associated power loss. Our work discusses the advantages of the InAsOI platform, which are based on the significantly low e-ph coupling measured compared to all-metallic state-of-the-art caloritronic devices. Our structure demonstrates values of the e-ph coupling constant up to two orders of magnitude smaller than typical values in metallic structures.","PeriodicalId":8094,"journal":{"name":"Applied Physics Letters","volume":"1 1","pages":""},"PeriodicalIF":4.0,"publicationDate":"2024-11-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142599846","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
A conventional vortex-induced vibration (VIV)-based energy harvester is typically restricted to capturing wind energy from a very limited range of wind directions, making it inefficient in varying wind conditions. This Letter proposes a tri-section beam configuration for VIV-based piezoelectric energy harvester to enable harnessing wind energy from varying incident angle with different vibration modes being triggered. The finite element analysis investigates the tri-section beam harvester's mode shapes and natural frequencies. A wind tunnel experiment is conducted for a comparative study of the energy output performance of the harvesters with straight and tri-section beams. The findings show that the proposed harvester with the tri-section beam can efficiently capture wind energy from a much wider range of incident angles, as opposed to the specific limited directions of its counterpart with the straight beam. The proposed harvester can also widen the lock-in speed range with a higher bending mode being triggered and achieve the optimal output power of 1.388 mW when the proposed harvester works in the second mode at a higher natural frequency, superior to that of its counterpart (0.386 mW) that can only work in the first mode. The proposed configuration sheds light on developing multi-directional and multi-modal VIV-based energy harvesters adapted to wind conditions in natural environments.
{"title":"Multi-directional and multi-modal vortex-induced vibrations for wind energy harvesting","authors":"Cuipeng Xia, Lihua Tang, Peilun Yin, Kean C. Aw","doi":"10.1063/5.0243653","DOIUrl":"https://doi.org/10.1063/5.0243653","url":null,"abstract":"A conventional vortex-induced vibration (VIV)-based energy harvester is typically restricted to capturing wind energy from a very limited range of wind directions, making it inefficient in varying wind conditions. This Letter proposes a tri-section beam configuration for VIV-based piezoelectric energy harvester to enable harnessing wind energy from varying incident angle with different vibration modes being triggered. The finite element analysis investigates the tri-section beam harvester's mode shapes and natural frequencies. A wind tunnel experiment is conducted for a comparative study of the energy output performance of the harvesters with straight and tri-section beams. The findings show that the proposed harvester with the tri-section beam can efficiently capture wind energy from a much wider range of incident angles, as opposed to the specific limited directions of its counterpart with the straight beam. The proposed harvester can also widen the lock-in speed range with a higher bending mode being triggered and achieve the optimal output power of 1.388 mW when the proposed harvester works in the second mode at a higher natural frequency, superior to that of its counterpart (0.386 mW) that can only work in the first mode. The proposed configuration sheds light on developing multi-directional and multi-modal VIV-based energy harvesters adapted to wind conditions in natural environments.","PeriodicalId":8094,"journal":{"name":"Applied Physics Letters","volume":"19 1","pages":""},"PeriodicalIF":4.0,"publicationDate":"2024-11-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142599851","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Sylvain Iseni, Thalita M. C. Nishime, Torsten Gerling
This Letter focuses on the discharge mechanisms of an atmospheric pressure micro-plasma jet optimized for endoscopic applications in biology and medicine. This capacitively coupled plasma (CCP) features a concentric double flow allowing for shielding the Helium or Neon plasma gas with carbon dioxide from the humid ambient air. High-resolution optical emission spectroscopy allows for the analyses of the Stark effect of the He I 492.19 nm and the Hydrogen Hβ lines to determine the electric field (EF) and the electron density spatially resolved along the discharge expansion outside the source. EF in Neon at atmospheric pressure was reliably determined with the Stark shift measurement of the weak Ne I line at 515.196 nm. In both gases, the EF diagnostic revealed a steep transition from CCP afterglow to streamer discharge with a magnitude up to 30 kV/cm. This research is a significant step forward in the field of plasma medicine with a plasma source capable of delivering a reactive chemistry with or without an intense EF to the target.
这封信主要介绍了一种大气压微等离子体射流的放电机制，该射流经过优化，可用于生物和医学领域的内窥镜应用。这种电容耦合等离子体（CCP）具有同心双流的特点，可以用二氧化碳屏蔽潮湿环境空气中的氦气或氖气等离子气体。利用高分辨率光学发射光谱分析 He I 492.19 nm 线和氢 Hβ 线的斯塔克效应，可以确定电场（EF）和电子密度，并沿放电源外的放电扩展进行空间分辨。通过对波长为 515.196 nm 的弱 Ne I 线进行斯塔克偏移测量，可以可靠地确定大气压下氖中的 EF。在这两种气体中，EF 诊断显示了从 CCP 余辉到流形放电的陡峭过渡，幅度高达 30 kV/cm。这项研究在等离子体医学领域迈出了重要的一步，等离子体源能够向目标提供有或无强 EF 的活性化学物质。
{"title":"Transition from afterglow to streamer discharge in an atmospheric capacitively coupled micro-plasma jet","authors":"Sylvain Iseni, Thalita M. C. Nishime, Torsten Gerling","doi":"10.1063/5.0232114","DOIUrl":"https://doi.org/10.1063/5.0232114","url":null,"abstract":"This Letter focuses on the discharge mechanisms of an atmospheric pressure micro-plasma jet optimized for endoscopic applications in biology and medicine. This capacitively coupled plasma (CCP) features a concentric double flow allowing for shielding the Helium or Neon plasma gas with carbon dioxide from the humid ambient air. High-resolution optical emission spectroscopy allows for the analyses of the Stark effect of the He I 492.19 nm and the Hydrogen Hβ lines to determine the electric field (EF) and the electron density spatially resolved along the discharge expansion outside the source. EF in Neon at atmospheric pressure was reliably determined with the Stark shift measurement of the weak Ne I line at 515.196 nm. In both gases, the EF diagnostic revealed a steep transition from CCP afterglow to streamer discharge with a magnitude up to 30 kV/cm. This research is a significant step forward in the field of plasma medicine with a plasma source capable of delivering a reactive chemistry with or without an intense EF to the target.","PeriodicalId":8094,"journal":{"name":"Applied Physics Letters","volume":"16 1","pages":""},"PeriodicalIF":4.0,"publicationDate":"2024-11-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142599526","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
The elimination of circulating tumor cells (CTCs) has recently emerged as a reliable route to inhibit metastasis of cancer. Despite some progress of photodynamic therapy and photothermal therapy (PTT), their unsatisfying efficacy or difficult operation has limited their clinical application. Herein, inspired by an immersion heater, an electrothermal therapy (ETT) strategy for the elimination of CTCs in the peripheral blood was proposed by using a functionalized injection needle. CTCs can be captured by the nanostructured surface of the injection needle and then killed in the energized state due to the temperature increase caused by electrothermal conversion. ETT not only avoids the irradiation through an external light source but also controls the temperature of the needle more easily and accurately than PTT. Thus, this study proposes a more applicable strategy for the elimination of CTCs.
近年来，消除循环肿瘤细胞（CTCs）已成为抑制癌症转移的可靠途径。尽管光动力疗法和光热疗法（PTT）取得了一些进展，但由于疗效不理想或操作困难，限制了它们在临床上的应用。本文受浸入式加热器的启发，提出了一种利用功能化注射针消除外周血中四氯化碳的电热疗法（ETT）策略。CTC 可被注射针的纳米结构表面捕获，然后在通电状态下因电热转换引起的温度升高而被杀死。ETT 不仅避免了外部光源的照射，而且比 PTT 更容易、更准确地控制针头的温度。因此，本研究提出了一种更适用于消除四氯化碳的策略。
{"title":"Electrothermal therapy for the in vivo elimination of circulating tumor cells by using a functionalized injection needle","authors":"Bingqi Zhang, Fengting Wang, Xiangtian Kong, Xiaoyao Zhang, Tongsheng Chen, Xinlei Li","doi":"10.1063/5.0226868","DOIUrl":"https://doi.org/10.1063/5.0226868","url":null,"abstract":"The elimination of circulating tumor cells (CTCs) has recently emerged as a reliable route to inhibit metastasis of cancer. Despite some progress of photodynamic therapy and photothermal therapy (PTT), their unsatisfying efficacy or difficult operation has limited their clinical application. Herein, inspired by an immersion heater, an electrothermal therapy (ETT) strategy for the elimination of CTCs in the peripheral blood was proposed by using a functionalized injection needle. CTCs can be captured by the nanostructured surface of the injection needle and then killed in the energized state due to the temperature increase caused by electrothermal conversion. ETT not only avoids the irradiation through an external light source but also controls the temperature of the needle more easily and accurately than PTT. Thus, this study proposes a more applicable strategy for the elimination of CTCs.","PeriodicalId":8094,"journal":{"name":"Applied Physics Letters","volume":"22 1","pages":""},"PeriodicalIF":4.0,"publicationDate":"2024-11-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142599525","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Superconducting niobium is the base material for many modern particle accelerators. The high cleanliness requirements in all radio frequency superconductor technology have led to the development of complex cleaning processes in recent decades. High-pressure rinsing, heating processes under vacuum and gas atmospheres as well as chemical and electrochemical polishing are commonly applied procedures, that are required to obtain the properties needed for their application. In order to optimize the surface finish of Nb materials in a more environment-compatible way, i.e., with less energy consumption and avoiding hazardous liquids, we report on a combination of simultaneous N-doping and laser polishing here. A nanosecond laser was employed, and the prepared Nb surfaces were investigated with a combination of electron microscopy, x-ray fluorescence spectroscopy (EDX), optical profilometry, and x-ray absorption spectroscopy (EXAFS) to show the effect of different N2-pressures during the laser polishing procedure in an ultrahigh vacuum chamber. The results show that for N2-pressures above ca. 10−3 mbar, traces of nitrogen can be observed by both EDX and EXAFS. In parallel, a smoothing of the surfaces occur, with slightly different roughnesses and microstructures of the polycrystalline Nb surfaces depending on the N2-pressure.
{"title":"Simultaneous laser polishing and N-doping of niobium","authors":"Florian Brockner, Dirk Lützenkirchen-Hecht","doi":"10.1063/5.0228817","DOIUrl":"https://doi.org/10.1063/5.0228817","url":null,"abstract":"Superconducting niobium is the base material for many modern particle accelerators. The high cleanliness requirements in all radio frequency superconductor technology have led to the development of complex cleaning processes in recent decades. High-pressure rinsing, heating processes under vacuum and gas atmospheres as well as chemical and electrochemical polishing are commonly applied procedures, that are required to obtain the properties needed for their application. In order to optimize the surface finish of Nb materials in a more environment-compatible way, i.e., with less energy consumption and avoiding hazardous liquids, we report on a combination of simultaneous N-doping and laser polishing here. A nanosecond laser was employed, and the prepared Nb surfaces were investigated with a combination of electron microscopy, x-ray fluorescence spectroscopy (EDX), optical profilometry, and x-ray absorption spectroscopy (EXAFS) to show the effect of different N2-pressures during the laser polishing procedure in an ultrahigh vacuum chamber. The results show that for N2-pressures above ca. 10−3 mbar, traces of nitrogen can be observed by both EDX and EXAFS. In parallel, a smoothing of the surfaces occur, with slightly different roughnesses and microstructures of the polycrystalline Nb surfaces depending on the N2-pressure.","PeriodicalId":8094,"journal":{"name":"Applied Physics Letters","volume":"13 1","pages":""},"PeriodicalIF":4.0,"publicationDate":"2024-11-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142599849","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Yijun Zhang, Yang Shen, Mei Cui, Jing Liu, Dabao Xie, Fangfang Ren, Shulin Gu, Youdou Zheng, Rong Zhang, Jiandong Ye
Orientation-dependent substrates provide effective platforms for achieving α-Ga2O3 with low dislocation densities, whereas the associated strain and dislocation dynamics have not been fully explored. Herein, we investigated the evolution of growth mode, interfacial strain, and dislocation propagation in the α-Ga2O3 epitaxial layer with various orientations, grown by the halide vapor-phase epitaxy. Strain tensor theory and geometric phase analysis indicate that the m-plane α-Ga2O3 epitaxial layer exhibits the lowest misfit tensile strain, measured at εxx = 1.46% and εyy = 1.81%, resulting in the lowest edge dislocation density. The m-plane lattice exhibits an inclination of 33.60°, while the c-plane lattice is horizontally aligned and the a-plane lattice oriented perpendicularly. The orientation-dependent growth significantly influences stress relaxation through the generation of misfit dislocations, originating from either basal or prismatic slip. Edge dislocations, induced by misfit dislocations, favor the c-axis, remaining well confined within the in-plane interfacial layer of the m-plane α-Ga2O3, leading to reduced low edge dislocation density in the subsequent thick epitaxial layer. These findings shed light on the epitaxial dynamics of α-Ga2O3 heteroepitaxy, paving the way for the development of high-performance power devices.
取向相关衬底为实现具有低位错密度的α-Ga2O3提供了有效平台，但相关的应变和位错动力学尚未得到充分探索。在此，我们研究了通过卤化物气相外延生长的不同取向的 α-Ga2O3 外延层中生长模式、界面应变和位错传播的演变。应变张量理论和几何相分析表明，m面α-Ga2O3外延层在εxx = 1.46%和εyy = 1.81%时表现出最低的错配拉伸应变，导致边缘位错密度最低。m 平面晶格的倾角为 33.60°，而 c 平面晶格水平排列，a 平面晶格垂直取向。取向依赖性生长通过产生错位而对应力松弛产生重大影响，错位产生于基底滑移或棱柱滑移。由错配位错诱发的边缘位错偏向于 c 轴，被很好地限制在 m 面 α-Ga2O3 的面内界面层中，导致随后的厚外延层中边缘位错密度降低。这些发现揭示了 α-Ga2O3 异质外延的外延动力学，为开发高性能功率器件铺平了道路。
{"title":"Orientation-dependent strain and dislocation in HVPE-grown α -Ga2O3 epilayers on sapphire substrates","authors":"Yijun Zhang, Yang Shen, Mei Cui, Jing Liu, Dabao Xie, Fangfang Ren, Shulin Gu, Youdou Zheng, Rong Zhang, Jiandong Ye","doi":"10.1063/5.0239533","DOIUrl":"https://doi.org/10.1063/5.0239533","url":null,"abstract":"Orientation-dependent substrates provide effective platforms for achieving α-Ga2O3 with low dislocation densities, whereas the associated strain and dislocation dynamics have not been fully explored. Herein, we investigated the evolution of growth mode, interfacial strain, and dislocation propagation in the α-Ga2O3 epitaxial layer with various orientations, grown by the halide vapor-phase epitaxy. Strain tensor theory and geometric phase analysis indicate that the m-plane α-Ga2O3 epitaxial layer exhibits the lowest misfit tensile strain, measured at εxx = 1.46% and εyy = 1.81%, resulting in the lowest edge dislocation density. The m-plane lattice exhibits an inclination of 33.60°, while the c-plane lattice is horizontally aligned and the a-plane lattice oriented perpendicularly. The orientation-dependent growth significantly influences stress relaxation through the generation of misfit dislocations, originating from either basal or prismatic slip. Edge dislocations, induced by misfit dislocations, favor the c-axis, remaining well confined within the in-plane interfacial layer of the m-plane α-Ga2O3, leading to reduced low edge dislocation density in the subsequent thick epitaxial layer. These findings shed light on the epitaxial dynamics of α-Ga2O3 heteroepitaxy, paving the way for the development of high-performance power devices.","PeriodicalId":8094,"journal":{"name":"Applied Physics Letters","volume":"95 1","pages":""},"PeriodicalIF":4.0,"publicationDate":"2024-11-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142599523","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Overcoming the diffraction limit has been a long-lasting pursuit for researchers owing to the great potential it offers in going beyond the fundamental resolution restriction in imaging processes. In acoustics, meta-lenses have been a promising way to achieve sub-wavelength imaging, the practical application of which, however, has been limited by expensive material manufacturing, complex system setup, and material loss. Here, we propose a set of procedures equivalent to a virtual super-lens that selectively amplifies the evanescent wave components in the measured acoustic field spectrum, thereby enabling super-resolution imaging without any auxiliary setups or purposely designed super-lens. The proposed virtual super-lens is experimentally verified by considering the imaging of an irregularly shaped sample with sub-wavelength features. We further demonstrate the robustness of the high-quality imaging performance remains acceptable with some environment background noises. In the light of the simple experimental setup involved, our proposed method is flexible and can be readily applied to various practical imaging scenarios.
{"title":"Acoustic sub-wavelength imaging via a virtual super-lens","authors":"Chen Zheng, Long-Sheng Zeng, Zong-Lin Li, Zi-Bin Lin, Peng Wu, Tuo Liu, Yu-Gui Peng, Xue-Feng Zhu","doi":"10.1063/5.0233793","DOIUrl":"https://doi.org/10.1063/5.0233793","url":null,"abstract":"Overcoming the diffraction limit has been a long-lasting pursuit for researchers owing to the great potential it offers in going beyond the fundamental resolution restriction in imaging processes. In acoustics, meta-lenses have been a promising way to achieve sub-wavelength imaging, the practical application of which, however, has been limited by expensive material manufacturing, complex system setup, and material loss. Here, we propose a set of procedures equivalent to a virtual super-lens that selectively amplifies the evanescent wave components in the measured acoustic field spectrum, thereby enabling super-resolution imaging without any auxiliary setups or purposely designed super-lens. The proposed virtual super-lens is experimentally verified by considering the imaging of an irregularly shaped sample with sub-wavelength features. We further demonstrate the robustness of the high-quality imaging performance remains acceptable with some environment background noises. In the light of the simple experimental setup involved, our proposed method is flexible and can be readily applied to various practical imaging scenarios.","PeriodicalId":8094,"journal":{"name":"Applied Physics Letters","volume":"4 1","pages":""},"PeriodicalIF":4.0,"publicationDate":"2024-11-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142599852","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Trevor Chistolini, Kyunghoon Lee, Archan Banerjee, Mohammed Alghadeer, Christian Jünger, M. Virginia P. Altoé, Chengyu Song, Sudi Chen, Feng Wang, David I. Santiago, Irfan Siddiqi
Suspending devices on thin SiN membranes can limit their interaction with the bulk substrate and reduce parasitic capacitance to ground. While suspending devices on membranes are used in many fields including radiation detection using superconducting circuits, there has been less investigation into maximum membrane aspect ratios and achievable suspended device quality, metrics important to establish the applicable scope of the technique. Here, we investigate these metrics by fabricating superconducting coplanar waveguide resonators entirely atop thin (∼110 nm) SiN membranes, where the membrane's shortest length to thickness yields an aspect ratio of approximately 7.4×103. We compare these membrane resonators to on-substrate resonators on the same chip, finding similar internal quality factors ∼105 at single photon levels. Furthermore, we confirm that these membranes do not adversely affect resonator thermalization and conduct further materials characterization. By achieving high quality superconducting circuit devices fully suspended on thin SiN membranes, our results help expand the technique's scope to potential uses including incorporating higher aspect ratio membranes for device suspension and creating larger footprint, high impedance, and high quality devices.
{"title":"Performance of superconducting resonators suspended on SiN membranes","authors":"Trevor Chistolini, Kyunghoon Lee, Archan Banerjee, Mohammed Alghadeer, Christian Jünger, M. Virginia P. Altoé, Chengyu Song, Sudi Chen, Feng Wang, David I. Santiago, Irfan Siddiqi","doi":"10.1063/5.0222680","DOIUrl":"https://doi.org/10.1063/5.0222680","url":null,"abstract":"Suspending devices on thin SiN membranes can limit their interaction with the bulk substrate and reduce parasitic capacitance to ground. While suspending devices on membranes are used in many fields including radiation detection using superconducting circuits, there has been less investigation into maximum membrane aspect ratios and achievable suspended device quality, metrics important to establish the applicable scope of the technique. Here, we investigate these metrics by fabricating superconducting coplanar waveguide resonators entirely atop thin (∼110 nm) SiN membranes, where the membrane's shortest length to thickness yields an aspect ratio of approximately 7.4×103. We compare these membrane resonators to on-substrate resonators on the same chip, finding similar internal quality factors ∼105 at single photon levels. Furthermore, we confirm that these membranes do not adversely affect resonator thermalization and conduct further materials characterization. By achieving high quality superconducting circuit devices fully suspended on thin SiN membranes, our results help expand the technique's scope to potential uses including incorporating higher aspect ratio membranes for device suspension and creating larger footprint, high impedance, and high quality devices.","PeriodicalId":8094,"journal":{"name":"Applied Physics Letters","volume":"95 1","pages":""},"PeriodicalIF":4.0,"publicationDate":"2024-11-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142599848","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
D. Furuya, M. Oda, Z. Chen, L. Li, H. Murakawa, H. Sakai, H. Nitani, Y. Niwa, H. Abe, H. Uetsuka, T. Karube, H. Inui, N. Hanasaki
High-/medium-entropy alloys (H/MEAs) have attracted attention for their excellent mechanical properties. According to first-principles calculations, the atomic displacements from their lattice points are element-dependent and correlated with the yield strength of H/MEAs. To investigate experimentally the element dependence of the local structure, we measured the extended x-ray absorption fine structure in seven kinds of face-centered cubic H/MEAs consisting of 3d transition metal elements. Our experimental results indicate that the local disorder around chromium (Cr) is larger than that around other elements, which is a common feature in all the measured fcc H/MEAs, aligning with prior theoretical studies indicating larger displacements of Cr in comparison to other elements. We discuss the mechanism underlying the local structural disorder induced by the constituent element Cr.
高/中熵合金（H/MEAs）因其优异的机械性能而备受关注。根据第一原理计算，原子从其晶格点的位移与元素有关，并与 H/MEAs 的屈服强度相关。为了通过实验研究局部结构的元素依赖性，我们测量了七种由 3d 过渡金属元素组成的面心立方 H/MEAs 的扩展 X 射线吸收精细结构。我们的实验结果表明，铬（Cr）周围的局部无序度大于其他元素周围的无序度，这是所有测量到的 fcc H/MEAs 的共同特征，这与之前理论研究表明铬的位移大于其他元素的结论一致。我们讨论了组成元素铬引起局部结构紊乱的内在机制。
{"title":"Local structural disorder introduced by Cr in fcc high-/medium-entropy alloys consisting of 3d transition metal elements","authors":"D. Furuya, M. Oda, Z. Chen, L. Li, H. Murakawa, H. Sakai, H. Nitani, Y. Niwa, H. Abe, H. Uetsuka, T. Karube, H. Inui, N. Hanasaki","doi":"10.1063/5.0231343","DOIUrl":"https://doi.org/10.1063/5.0231343","url":null,"abstract":"High-/medium-entropy alloys (H/MEAs) have attracted attention for their excellent mechanical properties. According to first-principles calculations, the atomic displacements from their lattice points are element-dependent and correlated with the yield strength of H/MEAs. To investigate experimentally the element dependence of the local structure, we measured the extended x-ray absorption fine structure in seven kinds of face-centered cubic H/MEAs consisting of 3d transition metal elements. Our experimental results indicate that the local disorder around chromium (Cr) is larger than that around other elements, which is a common feature in all the measured fcc H/MEAs, aligning with prior theoretical studies indicating larger displacements of Cr in comparison to other elements. We discuss the mechanism underlying the local structural disorder induced by the constituent element Cr.","PeriodicalId":8094,"journal":{"name":"Applied Physics Letters","volume":"71 1","pages":""},"PeriodicalIF":4.0,"publicationDate":"2024-11-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142599524","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
京公网安备 11010802042870号
京ICP备2023020795号-1
扫码关注我们
求助内容：
应助结果提醒方式：