Erratum: “Resonant photodetector for cavity- and phase-locking of squeezed state generation” [Rev. Sci. Instrum. 87, 103114 (2016)]

Chen, Chaoyong; Zhi-Xiu, Li; Jin, Xiaoli; Zheng, Yaohui

doi:10.1063/1.5004706

Cited by 6 publications

(12 citation statements)

References 1 publication

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“…Bimorph actuators can function independently and do not require other mechanical components, which can also reduce weight penalties. As an example, an articulated finger driven by three discrete single‐mode piezoelectric actuators bridged by two interconnecting elements has been prepared by Chen et al within a compact structure by eliminating design challenges associated with coincidence of modal frequencies 119. Bimorph elements have also been employed in robotics to generate complex and diverse modes of locomotion.…”

Section: Piezoelectric Ceramics Polymers and Compositesmentioning

confidence: 99%

Materials as Machines

2020

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of responsive materials as machines is in robotics. The vision, leadership, and research of Bar-Cohen is seminal in both invigorating and focusing current-day research activities to develop responsive materials [2] and implement [3] them as lightweight, dexterous, and gentle (e.g., soft) robotic elements. In this spirit, this review exhaustively details the materials, the nature of their stimuli-response, and discusses considerations for their implementation in robotic systems and subsystems.Robotics is a well-established but growing field of research. Sustained progress in both performance and functionality continue to be realized in commercial robotic systems largely based on conventional materials and their integration with mechanisms. A recent example is the Atlas robot from Boston Dynamics [4] (Figure 1a). The incorporation of stimuli-responsive materials in robotics has largely focused on component-level demonstrations to extend the performance of a subsystem (such as a hand or gripper).Stimuli-responsive materials, spanning nearly all classes of materials and size scales, are currently subject to widespread examination in corporate, government, and academic research laboratories (Figure 1b-d). [5][6][7] In some cases, these materials have already found widespread commercial implementation in end use and are comparatively mature. The materials and fundamentals of their responses are summarized in Figure 2. Shape memory alloys (SMAs) and ceramic piezoelectric materials are distinctive in that they are hard, stimuli-responsive materials. Deformation of these materials can produce large energy densities due to their inherent stiffness. Electroactive polymers (EAPs) remain a topic of considerable interest, particularly dielectric elastomer actuators (DEAs). Engineered systems are rapidly emerging and enabling performance gains in robotics, largely based on pneumatic or fluidic (such as HASEL [8] actuators) transport processes that localize deformation to generate force or produce motion. Soft materials, such as shape memory polymers (SMPs), hydrogels, and liquid crystalline polymer networks (LCNs) and elastomers (LCEs) may offer distinctive functional performance to robotic systems in allowing local control of deformation without the need for complex interfacing with mechanisms. As will be evident, each of these materials has inherent advantages and performance tradeoffs that must be considered in functional implementations. However, responsive material systems have a common obstacle to widespread use: the performance and Machines are systems that harness input power to extend or advance function. Fundamentally, machines are based on the integration of materials with mechanisms to accomplish tasks-such as generating motion or lifting an object. An emerging research paradigm is the design, synthesis, and integration of responsive materials within or as machines. Herein, a particular focus is the integration of responsive materials to enable robotic (machine) functions such as gripping, lifting, or motility (walk...

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Section: Piezoelectric Ceramics Polymers and Compositesmentioning

confidence: 99%

Materials as Machines

2020

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“…Compared with the conventional broad-band photodetector, the RPD can not only significantly boost the signal at the resonant frequency, but also effectively suppress a large amount of noise outside the bandwidth, which represents a well-established technique for extracting the high-SNR error signal. [28] The performance of the RPD is often evaluated by the Q factor. As the Q factor increases, the 3-dB bandwidth of the RPD is reduced and the overall response is increased, hence the SNR of the error signal is improved.…”

Section: Photodetector Designmentioning

confidence: 99%

“…In virtue of the design idea of the resonant receiver, we obtained a high gain resonant photodetector (RPD) with a Q factor of 97.6 at the frequency of 58.6 MHz by utilizing a LC circuit to couple the photodiode to the load resistance directly. [28] Subsequently, by adding a winding transformer between the photodiode and the load resistance, the Q factor of the RPD was close to 100 in the frequency region of higher than 100 MHz. [29] Except for the extension of the resonant frequency, the improvement of the Q factor is another eternal pursuit of the RPD.…”

Section: Introductionmentioning

confidence: 97%

Realization of ultralow power phase locking by optimizing Q factor of resonant photodetector*

et al. 2020

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We design and construct a resonant photodetector (RPD) with a Q factor of 320.83 at the resonant frequency of 38.5 MHz on the basis of a theoretical analysis. Compared with the existing RPD under the same conditions, the signal-to-noise-ratio of the error signal is increased by 15 dB and the minimum operation power is reduced from −55 dBm to −70 dBm. By comparing the standard deviations of the stability curves, we confirm that the RPD has a dramatic improvement on ultralow power extraction. In virtue of the RPD, we have completed the demonstration of channel multiplexing quantum communication.

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“…An advanced Thomson scattering (TS) system [25] will be used to measure the electron density, neutral density and electron temperature profiles. Furthermore, the energy of energetic particles will be diagnosed by gridded energy analyzer [26] and multichannel soft x-ray spectrometer [27].…”

Section: Brief Introduction To Drexmentioning

confidence: 99%

Development of plasma sources for Dipole Research EXperiment (DREX)

Xiao

Wang

Peng

et al. 2017

Plasma Sci. Technol.

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Dipole Research EXperiment (DREX) is a new terrella device as part of the Space Plasma Environment Research Facility (SPERF) for laboratory studies of space physics relevant to the inner magnetospheric plasmas. Adequate plasma sources are very important for DREX to achieve its scientific goals. According to different research requirements, there are two density regimes for DREX. The low density regime will be achieved by an electron cyclotron resonance (ECR) system for the 'whistler/chorus' wave investigation, while the high density regime will be achieved by biased cold cathode discharge for the desired 'Alfvén' wave study. The parameters of 'whistler/chorus' waves and 'Alfvén' waves are determined by the scaling law between space and laboratory plasmas in the current device. In this paper, the initial design of these two plasma sources for DREX is described. Focus is placed on the chosen frequency and operation mode of the ECR system which will produce relatively low density 'artificial radiation belt' plasmas and the seed electrons, followed by the design of biased cold cathode discharge to generate plasma with high density.

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Erratum: “Resonant photodetector for cavity- and phase-locking of squeezed state generation” [Rev. Sci. Instrum. 87, 103114 (2016)]

Cited by 6 publications

References 1 publication

Materials as Machines

Materials as Machines

Realization of ultralow power phase locking by optimizing Q factor of resonant photodetector*

Development of plasma sources for Dipole Research EXperiment (DREX)

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