51 research outputs found
Orbital Angular Momentum Mode Multiplexer Based on Multimode Micro-Ring Resonator with Angular Gratings
We demonstrate silicon photonic orbital angular momentum multiplexing devices based on mulitmode microring resonator. Up to four optical beams carrying different orbital angular momentum states can be selectively excited from different input ports
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Predicting Capacity of Hard Carbon Anodes in Sodium-Ion Batteries Using Porosity Measurements
We report an inverse relationship between measurable porosity values and reversible capacity from sucrose-derived hard carbon as an anode for sodium-ion batteries (SIBs). Materials with low measureable pore volumes and surface areas obtained through Nâ sorption yield higher reversible capacities. Conversely, increasing measurable porosity and specific surface area leads to sharp decreases in reversible capacity. Utilizing a low porosity material, we thus are able to obtain a reversible capacity of 335 mAh gâ»Âč. These findings suggest that sodium-ion storage is highly dependent on the absence of pores detectable through Nâ sorption in sucrose-derived carbon
Orbital angular momentum vector modes (de)multiplexer based on multimode micro-ring
Orbital angular momentum (OAM) multiplexing has emerged as an important method to increase the communication capacities in future optical information technologies. In this work, we demonstrate a silicon integrated OAM (de)multiplexer with a very simple structure. By simply tapping the evanescent wave of two different whispering gallery modes rotating inside a multimodal micro-ring resonator, four in-plane waveguide modes are converted to four free-space vector OAM beams with high mode purity. We further demonstrate chip-to-chip OAM multiplexing transmission using a pair of silicon devices, which shows low-level mode crosstalk and favorable link performance
Integrated optical vortex beam receivers
A simple and ultra-compact integrated optical vortex beam receiver device is
presented. The device is based on the coupling between the optical vortex modes and
whispering gallery modes in a micro-ring resonator via embedded angular gratings, which
provides the selective reception of optical vortex modes with definitive total angular
momentum (summation of spin and orbital angular momentum) through the phase matching
condition in the coupling process. Experimental characterization confirms the correct
detection of the total angular momentum carried by the vortex beams incident on the device.
In addition, photonic spin-controlled unidirectional excitation of whispering-gallery modes in
the ring receiver is also observed, and utilized to differentiate between left- and right-circular
polarizations and therefore unambiguously identify the orbital angular momentum of incident
light. Such characteristics provide an effective mode-selective receiver for the eigen-modes in
orbital angular momentum fiber transmission where the circularly polarized OAM modes can
be used as data communications channels in multiplexed communications or as photonic
states in quantum information applications
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Reducing COâ to dense nanoporous graphene by Mg/Zn for high power electrochemical capacitors
Converting CO2 to valuable materials is attractive.Herein, we report using simple metallothermic reactions to reduce atmospheric CO2 to dense nanoporous graphene. By using a Zn/Mg mixture as a reductant, the resulted nanoporous graphene exhibits highly desirable properties: high specific surface area of 1900 m2/g, a great conductivity of 1050 S/m and a tap density of 0.63 g/cm3, comparable to activated carbon. The nanoporous graphene contains a fine mesoporous structure constructed by curved few-layer graphene nanosheets. The unique property ensemble enables one of the best high-rate performances reported for electrochemical capacitors: a specific capacitance of ~170F/g obtained at 2000 mV/s and 40 F/g at a frequency of 120 Hz. This simple fabricating strategy conceptually provides opportunities for materials scientists to design and prepare novel carbon materials with metallothermic reactions.This is the publisherâs final pdf. The published article is copyrighted by Elsevier and can be found at: http://www.journals.elsevier.com/nano-energy/.Keywords: Magnesiothermic reduction, Nanoporous graphene, COâ reduction, Electrochemical capacitor
Highly selective adsorption of ethylene over ethane in a MOF featuring the combination of open metal site and Ï-complexation
Multivariable analysis of egg white protein-chitosan interaction: Influence of pH, temperature, biopolymers ratio, and ionic concentration
The influence of pH, temperature, biopolymer ratio, total concentration, and ionic concentration on the interaction between egg white protein (EWP) and chitosan (CS) was investigated through turbidity, zeta potential, and state diagram in our research. In addition, phase behavior was observed under various conditions. The turbidity of EWP remained low (turbidity < 0.03) and basically unchanged at a wide range of pH (4.0â8.0), while the turbidity of CS was slightly higher (turbidity < 0.2) after pH 7.0 than before. Moreover, under the same conditions, a sharply rising peak pattern was observed for the complex between EWP and CS. The maximum turbidity value was observed at 55 °C, and the temperature had a mild effect on turbidity. The optimum EWP to CS ratio was found to be 12:1 based on the turbidity curves and state diagrams influenced by different biopolymer mixing ratios. With the enhanced concentrations of total biopolymer, the maximum turbidity rose insignificantly above 0.1%
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