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A simple graphene nanoribbon structure-based terahertz all-optical logic gates with fano resonance
摘要： We design and numerically analyze an all-optical logic gates in the terahertz regime. The structure is composed of four graphene waveguides and a cavity resonator, which is a very simple structure. Due to the Fano resonance exciting in the asymmetry structure, the transmission spectrum can suddenly drops to a minimum value to excite logic “ON/OFF” state. By using this character, XOR, XNOR, and NOT gates can be realized with high contrast ratio of 17.8, 15.2 and 19.1 dB between logical “ON” and “OFF” states, respectively. This study opens a new avenue for designing graphene nanoribbon based integrated circuits.
关键词： Fano resonance,Graphene nanoribbon,Logic gates
更新于2025-09-16 10:30:52
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ALL-OPTICAL LOGIC GATES BASED ON SPATIAL-SOLITON INTERACTIONS IN OPTICAL COMMUNICATION SPECTRAL REGION
摘要： New designs of all-optical logic gates based on spatial-soliton interactions in optical communication spectral regions were proposed. The proposed structures are composed of local nonlinear Mach-Zehnder interferometer (MZI) waveguide structures with multi-input ports and two nonlinear output ports. They can be used to design various all-optical logic gates. The nonlinear MZI waveguide structure with local nonlinear waveguides functions like a phase shifter. It employs angular de?ection of spatial solitons controlled by the phase modulation created in the local nonlinear MZI. The light-induced index changes in the local nonlinear MZI waveguide structures break the symmetry of structure and make the output signal beam propagate through di?erent nonlinear output waveguides. By properly choosing the input control power, the spatial solitons will be switched to di?erent output ports. The numerical results show that the proposed local nonlinear MZI waveguide structures could really function as all-optical logic gates in the optical communication spectral region.
关键词： all-optical logic gates,spatial-soliton interactions,nonlinear waveguides,optical communication spectral regions,Mach-Zehnder interferometer
更新于2025-09-12 10:27:22
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Multi C–C/ C–N Coupled Light‐Emitting Aliphatic Terpolymers: N–H Functionalized Fluorophore‐Monomers and High‐Performance Applications
摘要： For circumventing the costly fluorescent labelling, nonconventional multifunctional intrinsically fluorescent aliphatic-terpolymers, i.e., 1, 2, 3, 4, and 5, were synthesized via C–C/ C–N coupled in situ protrusions of fluorophore-monomers in solution polymerization of two non-emissive monomers. These scalable terpolymers were suitable for sensing and high-performance exclusion of Cu(II), logic-function, and bioimaging. The structures of terpolymers, fluorescent monomers, aggregation-induced enhanced emissions, bioimaging abilities, and the superadsorption were understood using 1H/ 13C NMR, Fourier transform infrared spectroscopy, X-ray photoelectron spectroscopy, ultraviolet-visible spectroscopy, atomic absorption spectroscopy, thermogravimetric analysis, high-resolution transmission electron microscopy, dynamic light scattering, electron paramagnetic resonance spectroscopy, solid-state fluorescence, fluorescence imaging, and fluorescence lifetime, along with isotherms, kinetics, and thermodynamic studies. The geometries and electronic structures of fluorophores and absorption-emission properties of terpolymers were examined using density functional theory, time-dependent DFT, and natural transition orbital analyses. For 1, 2, and 5, the limit of detection values were 1.03 × 10?7, 1.65 × 10?7, and 1.77 × 10?7 M, respectively. The maximum adsorption capacities were 1575.21, 1433.70, and 1472.21 mg g?1 for 1, 2, and 5, respectively.
关键词： aliphatic,aggregation-induced enhanced emissions,light-emitting,logic-gates,superadsorption,Nonconventional,bioimaging,Cu(II)-sensors,DFT-TDDFT-NTO,terpolymers
更新于2025-09-11 14:15:04
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Vortex Beam Encoded All-Optical Logic Gates Based on Nano-Ring Plasmonic Antennas
摘要： Vortex beam encoded all-optical logic gates are suggested to be very important in future information processing. However, within current logic devices, only a few are encoded by using vortex beams and, in these devices, some space optical elements with big footprints (mirror, dove prism and pentaprism) are indispensable components, which is not conducive to device integration. In this paper, an integrated vortex beam encoded all-optical logic gate based on a nano-ring plasmonic antenna is proposed. In our scheme, by defining the two circular polarization states of the input vortex beams as the input logic states and the normalized intensity of the plasmonic field at the center of the nano-ring as the output logic states, OR and AND (NOR and NAND) logic gates are realized when two 1st (1st) order vortex beams are chosen as the two input signals; and a NOT logic gate is obtained when one 1st order vortex beam is chosen as the input signal. In addition, by defining the two linear polarization states (x and y polarization) of the input vortex beams as the two input logic states, an XNOR logic gate is realized when two 1st order vortex beams are chosen as the two input signals.
关键词： vortex beam,all-optical logic gates,plasmonic
更新于2025-09-11 14:15:04
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Fluorescence ON-OFF switching, Boolean logic gates like behavior of carbon quantum dots and highly sensitive bovine serum albumin sensing
摘要： We demonstrate ?uorescence “ON-OFF” switching and photonic logic gates based on ?uorescence response of carbon quantum dots (CQDs) in the presence of graphene oxide (GO), reduced graphene oxide (RGO), and bovine serum albumin (BSA). We study the excited state electron and energy transfer interactions among the carbon based materials in detail through steady state ?uorescence (SSF) and time resolved ?uorescence (TRF) spectroscopy. CQDs function as donor; GO and RGO function as acceptors. SSF results show the ?uorescence “turn-OFF” behavior of CQDs in the presence of GO and RGO, and the reason is explained through Stern-Volmer plots. TRF results reveal a decrease in the decay time components of CQDs in the presence of GO and RGO. The gradual recovery of quenched ?uorescence of CQDs is observed by the addition of BSA at nanomolar concentrations which shows the highly sensitive “turn-ON” BSA sensing. Single input and two inputs photonic logic gates are implemented based on the ?uorescence response of CQDs in the presence of GO, RGO, and BSA in di?erent input combinations. The NOT, PASS1, NOR, and IMPLICATION gates like behavior of CQDs is demonstrated.
关键词： bovine serum albumin sensing,fluorescence ON-OFF switching,carbon quantum dots,Boolean logic gates
更新于2025-09-11 14:15:04
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[IEEE 2018 International Conference on Current Trends towards Converging Technologies (ICCTCT) - Coimbatore, India (2018.3.1-2018.3.3)] 2018 International Conference on Current Trends towards Converging Technologies (ICCTCT) - Design and Analysis of Optical Logic Gate using Two Dimension Photonic Crystal
摘要： In this paper, AND Logic gate functions are realized in a hexagonal lattice using 2D photonic crystal. The proposed logic gate is formed by the combination interference resonance phenomenon. Initially, the AND gate is designed without reference input which is considered as a two input logic gate and followed by another structure of photonic crystals with reference input is designed and its named as three input logic gate. The performance of proposed AND Logic gate structure is simulated by using 2D FDTD method. The simulation results show that the contrast ratio for two input AND gate and three input AND gate are 6.64 dB and 10.96 dB, respectively.
关键词： AND,Interference,Resonance,PBG Logic gates,Photonic crystal
更新于2025-09-09 09:28:46
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Designing Efficient Circuits Based on Runtime-Reconfigurable Field-Effect Transistors
摘要： An early evaluation in terms of circuit design is in order to assess the feasibility and practicability essential aspects for emerging nanotechnologies. Recon?gurable nanotechnologies, such as silicon or germanium nanowire-based recon?gurable ?eld-effect transistors, hold great promise as suitable primitives for enabling multiple functionalities per computational unit. However, contemporary CMOS circuit designs when applied directly with this emerging nanotechnology often result in sub-optimal designs. For example, 31% and 71% larger area was obtained for our two exemplary designs. Hence, new approaches delivering tailored circuit designs are needed to truly tap the exciting feature set of these recon?gurable nanotechnologies. To this effect, we propose six functionally enhanced logic gates based on a recon?gurable nanowire technology and employ these logic gates in ef?cient circuit designs. We carry out a detailed comparative study for a recon?gurable multifunctional circuit, which shows better normalized circuit delay (20.14%), area (32.40%), and activity as the power metric (40%) while exhibiting similar functionality as compared with the CMOS reference design. We further propose a novel design for a 1-bit arithmetic logic unit-based on silicon nanowire recon?gurable FETs with the area, normalized circuit delay, and activity gains of 30%, 34%, and 36%, respectively, as compared with the contemporary CMOS version.
关键词： silicon nanowire (SiNW) transistor,multi-independent gate recon?gurable ?eld-effect transistor,three-independent gate ?eld-effect transistor (TIGFET),Functionally enhanced logic gates
更新于2025-09-04 15:30:14