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High-performance flexible UV photodetectors based on AZO/ZnO/PVK/PEDOT:PSS heterostructures integrated on human hair
摘要： Flexible optoelectronics is an emerging research field that has attracted profound interest in recent years due to the special functions and potential applications of these devices in flexible image sensors, optical computing, energy conversion devices, Internet of Things and other technologies. Here, we demonstrate the high-performance UV photodetectors using AZO/ZnO nanorods/PVK/PEDOT:PSS heterostructures integrated on human hair. Due to the precise interfacial energy-level alignment among all layers and superior mechanical characteristics of human hair, the as-obtained photodetector shows a fast response time, high photoresponsivity and excellent flexibility. According to integrate 7 heterostructures as 7 display pixels, the flexible UV-image sensor has superior device performance and outstanding flexibility and can produce vivid and accurate images of Arabic numerals from 0 to 9. Different combinations of the two heterostructures can also be used to achieve flexible photon-triggered logic functions including AND, OR and NAND gates. The findings in this work indicate the possibility of using the human hair as fibre-shaped flexible substrate and will allow the use of hair-based hierarchical heterostructures as building blocks to create exciting opportunities for next generation high-performance, multifunctional, low-cost, and flexible optoelectronic devices.
关键词： photon-triggered logic gates,fast photoresponse,UV photodetectors,human hair,optical-image sensors
更新于2025-11-14 17:04:02
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[IEEE 2018 3rd International Conference for Convergence in Technology (I2CT) - Pune (2018.4.6-2018.4.8)] 2018 3rd International Conference for Convergence in Technology (I2CT) - Implementation of Polarization-Conversion in Ring-Resonator and its Application to Design All-Optical NOT Logic Gate
摘要： All-optical NOT logic gate is theoretically described using the concept of polarization-conversion in ring resonator. Conversion of polarization states occurs at very high speed of 0.2 ps and high Q-factor of about 1500 is obtained. The design may used in intensity based all-optical switching as well as in designing of all-optical logic gates. Low pump power of about 40 nW/m is required for such conversion based all-optical gates. Suitability in pumping, refractive index contrast, height-to-width ratio of waveguide and phase-matching condition is necessary to obtain such results.
关键词： ring-resonator,polarization conversion,all-optical switch,FDTD simulation,logic gates
更新于2025-09-23 15:23:52
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SERS detection of mercury (II)/lead (II): A new class of DNA logic gates
摘要： A conceptually new class of DNA logic gates for Hg2+ and Pb2+ ion simultaneous detection has been constructed based on the activity of DNAzyme dependent on metal ions. For sensitive and specific detection of Hg2+ and Pb2+ ions, we demonstrate a surface-enhanced Raman scattering (SERS)-active platform by employing the oligonucleotide-functionalized and gold coated polystyrene microspheres (PSMPs). In this work, Hg2+ and Pb2+ were used as the input, and the SERS signals were the output. Hg2+ ions were captured by a mismatched T-Hg-T bridge. Pb2+ ions were bound to 8–17DNAzyme to break the cleavage substrate. The limit of detection (LOD) of Hg2+ is 0.1 nmol L?1 and Pb2+ is 1.0 nmol L?1, which is far below the limit of 10.0 ppb (31 nmol L?1) and 10.0 ppm (3.02 × 104 nmol L?1) for drinking water stipulated by the World Health Organization. Additionally, this system has the potential to be ideal candidates for intelligent DNA calculator design applications. Furthermore, the designed strategy could be extended to other multiplex metal ions that can be combined with DNA molecules, and can be applied to many other fields such as environmental detection, toxin detection and liquid analysis.
关键词： SERS,DNA logic gates,Simultaneous detection
更新于2025-09-23 15:22:29
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[IEEE 2019 PhotonIcs & Electromagnetics Research Symposium - Spring (PIERS-Spring) - Rome, Italy (2019.6.17-2019.6.20)] 2019 PhotonIcs & Electromagnetics Research Symposium - Spring (PIERS-Spring) - Miniature Multiferroic Interferometer for Voltage-controlled Spin-wave Logic Gates
摘要： Novel Mach-Zender-type interferometer based on thin-film multiferroic structure has been proposed and described. The performance of the main element of such device, a tunable phase shifter, has been analysed. The distinctive features of the proposed interferometer are high efficiency and small device area in comparison with other spin-wave logic gates. We expect that our results allow exploiting spin-electromagnetic wave phenomena for enhanced logic functionality and efficient data transfer.
关键词： multiferroic structure,spin-electromagnetic wave phenomena,spin-wave logic gates,Mach-Zender-type interferometer
更新于2025-09-23 15:21:01
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Inverted mirror image molecular beacon-based three concatenated logic gates to detect p53 tumor suppressor gene
摘要： Mutation of p53 tumor suppressor gene represents one of the early molecular events in tumor initiation and progression. Although molecular computing holds tremendous potential with important applications in diagnosis, prognosis and treatment of human diseases at the molecular level, designing molecular logic gates to implement cascade amplification via operating autonomously for the detection of point mutations still remains challenging. In this contribution, we developed a three concatenated logic gates (TCLG) to perform multiple strand displacement amplification (m-SDA) for screening the cancer-related point mutations only via designing an innovative molecular beacon (MB). Specifically, using p53 gene as model target, extending the two ends of a MB via adding two fragments with the same sequence achieves two unique terminal single-stranded (ss) overhangs. After self-folding of MB into hairpin structure, the two overhangs exhibit a near inverted mirror image (IM) relationship if taking the base nature and direction into account. For this, the probe is called IM-MB. Because cascade SDAs can occur on IM-MB and promote each other, the target gene can be detected down to 10 pM. Along this line, the TCLG circuit was proposed, and two primers and target gene serve as the indispensable input signals. Utilizing this logic circuit, the point mutation or absence of target gene can be sensitively screened. Moreover, its potential application in the recognition of point mutations in complex biomatrix has been demonstrated via blind test. The proof-of-concept scheme is expected to provide new insight into the development of DNA-based molecular logic gates and their applications in basic research, medical diagnosis and precise treatment and treatment of genetic diseases.
关键词： Multiple strand displacement amplification,p53 tumor suppressor gene,Logic gates,DNA
更新于2025-09-23 15:21:01
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Ultra-scaled MoS<sub>2</sub> transistors and circuits fabricated without nanolithography
摘要： The future scaling of semiconductor devices can be continued only by the development of novel nanofabrication techniques and atomically thin transistor channels. Here we demonstrate ultra-scaled MoS2 field-effect transistors (FETs) realized by shadow evaporation method which does not require nanofabrication. The method enables large-scale fabrication of MoS2 FETs with fully gated 10-nm long channels. The realized ultra-scaled MoS2 FETs exhibit very small hysteresis of current-voltage characteristics, record high drain currents of ～ 560 A/m, very good drain current saturation for such ultra-short devices, subthreshold swing ～ 120 mV/dec, and drain current on/off ratio ～ 106 in air ambient. The fabricated ultra-scaled MoS2 FETs are also used to realize logic gates in n-type depletion-load technology. The inverters exhibit a voltage gain of ～ 50 at a power supply voltage of only 1.5 V and are capable of in/out signal matching.
关键词： transistor scaling,field-effect transistors,logic gates,MoS2,short-channel effects
更新于2025-09-23 15:19:57
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Controlled Phase Gate Protocol for Neutral Atoms via Off-Resonant Modulated Driving
摘要： Neutral-atom arrays serve as an ideal platform to study quantum simulation and quantum logic gates, where intense efforts have been devoted to improving the fidelity of two-qubit gates. We report our recent findings in constructing a different type of two-qubit controlled phase gate protocol with neutral atoms enabled by the Rydberg blockade, which aims at both robustness and high fidelity. It relies upon a modulated driving pulse with a specially tailored smooth waveform to gain appropriate phase accumulations for quantum gates. The major features include finishing a gate operation within a single pulse, not necessarily requiring individual site addressing, not being sensitive to the exact value of the blockade shift, and suppressing the population leakage error and rotation error. Building upon this progress, we further develop an upgrade in the form of dual-pulse off-resonant modulated driving with the major distinct feature of Doppler insensitivity, in order to address the challenge to the fidelity of two-qubit gates caused by residual thermal motion of the cold atoms. In principle, the gate fidelity remains reasonably high over a relatively significant velocity range of the qubit atoms. Moreover, we anticipate that this will inspire future improvements in gate protocols for other types of qubit platforms, and the strategies used here may find applications in the area of quantum optimal control.
关键词： Doppler insensitivity,controlled phase gate,quantum logic gates,neutral-atom arrays,Rydberg blockade,quantum simulation
更新于2025-09-23 15:19:57
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Efficient “Ratiometric” fluorescence chemosensor for selective detection of Hg2+ ions based on phosphonates: its live cell imaging and molecular keypad lock applications
摘要： We report that the smart chemosensors (L1 and L2) can detect Hg2+ ion selectively over other metal ions was studied by various spectral techniques. Particularly, the proposed chemosensors exhibiting the notable color and spectra changes with the addition of mercury ions. Moreover, the colorimetric and fluorescence could be reversed with the addition of EDTA into the L1-Hg2+ and L2-Hg2+ solutions. Based on the admirable reversibility process, we displayed a molecular-scale sequential information processing circuit proposed the “Writing-Reading-Erasing-Reading” and “Multi-write” behaviors in the form of binary logic. Furthermore, L1 and L2 mimic as a molecular keypad lock and molecular logic gates with the successive addition of Hg2+ and EDTA. The binding ability of Hg2+ ion with L1 and L2 was further demonstrated by Density Functional Theory (DFT) studies. The biocompatibility of these chemosensors is successfully used for live cell imaging of Hg2+ in HeLa cells under the experimental conditions. Furthermore, the sensors L1 and L2 were also useful to determine the concentration of Hg2+ ion in real water samples to exhibit its practical applications.
关键词： Cell imaging,Molecular keypad lock,Chemosensors,Turn-off Fluorescence,Mercury (II),Logic gates
更新于2025-09-19 17:15:36
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Ultrafast all-optical digital comparator using quantum-dot semiconductor optical amplifiers
摘要： In this investigation, three types of 160 Gb/s all-optical digital comparators using quantum-dot semiconductor optical amplifiers (QD-SOAs) are constructed. These configurations have different combination patterns of logic gates and QD-SOAs. Based on numerical simulations, we investigate and evaluate the performance of the devices in terms of the number of logic gates and QD-SOAs, and the value of the extinction ratio (ER). In addition, we demonstrate the effect of amplified spontaneous emission (ASE) noise on the ER and Q-factor. The results show that two of the three configurations are superior to the other configuration in terms of circuit complexity, value of ER, and sensitivity to injection current. Moreover, these two configurations achieve ER values over 10 dB and Q-factor over 9, even when intense ASE noise is considered. The proposed configurations have several advantages such as high quality, easy configuration, insensitivity to injection current, and strong noise robustness, which are favorable for practical applications. This investigation also facilitates the specification of the pros and cons of each configuration, and the determination of the appropriate comparator according to the desired requirements.
关键词： Logic gates,All-optical digital comparator,Amplified spontaneous emission (ASE),Quantum-dot semiconductor optical amplifier (SOA)
更新于2025-09-19 17:15:36
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Terahertz plasmonic SWAP and Fredkin gates utilizing graphene nano-ribbon waveguides
摘要： In this paper, terahertz plasmonic SWAP and Fredkin gates using the Si–SiO2-air–graphene–air structure deposited on the SiO2/Si substrate are presented and numerically studied. The presented terahertz plasmonic SWAP gate is composed of a symmetric Y-junction, two all-pass microring resonators, and a double series-coupled microring resonator, and the proposed terahertz plasmonic Fredkin gate comprises a three-arm Y-junction, three all-pass microring resonators, and a double series-coupled microring resonator. By flexibly adjusting graphene’s chemical potential in rings, microring resonators’ resonant states produce the change, then logic operations of SWAP and Fredkin gates can be correctly executed. Simulation results show that our designed terahertz plasmonic SWAP and Fredkin gates exhibit excellent extinction ratio and crosstalk. For the designed terahertz plasmonic SWAP gate, the extinction ratio can be greater than 20.92 dB and the crosstalk can be less than ?21.38 dB. With input logic states of ‘000’, ‘001’, ‘010’, ‘011’, ‘100’, ‘101’, ‘110’, and ‘111’, the designed terahertz plasmonic Fredkin gate has a minimum extinction ratio of 21.65 dB and a maximum crosstalk of ?21.15 dB.
关键词： Integrated optics,Logic gates,Waveguide,Graphene nano-ribbon,Plasmonic
更新于2025-09-19 17:13:59