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The spin-dependent exchange-correlation potential is approximated within the generalized gradient approximation using the QuantumWise toolkit ATK, which employs local numerical double-zeta polarized basis orbitals. We performed density-functional theory (DFT) based calculations to obtain electronic structure of both zig-zag and armchair GNRs with lateral constrictions. The lateral confinement of the two-dimensional electron gas in graphene nanoribbons (GNR) can tune their electrical properties. more Graphene, a two-dimensional sheet of sp-bonded carbon arranged in a honeycomb lattice, is a potential candidate for use in future nanodevices. Graphene, a two-dimensional sheet of sp-bonded carbon arranged in a honeycomb lattice, is a poten. The interaction between UV light and ZnO/DND grains was investigated by two dimensional Silvaco TCAD simulation.
Photoresponsivity of the double-layered photodetector (ZnO/DND) is 0.35 AThe ZnO/DND structure shows more than ten times higher response and faster reactivity in comparison with a single-layered photodetector. The response, response time, and recovery time were measured for different UV wavelengths (365, 385, and 405 nm), light intensities, temperatures, and bias voltages. The crystalline configuration and structural quality of ZnO and nanodiamond were investigated by X-ray diffraction and Raman spectroscopy. The morphological structure of the deposited materials was visualized and analyzed by scanning electron microscopy and atomic force microscopy. more The single- and double-layered photodetectors based on ZnO and/or detonation nanodiamond (DND) have been developed via a sequential inkjet printing on the interdigital electrode platform using a diamond and zinc oxide precursor ink. It include YOKOGAWA, Keysight Technologies, Thorlabs, Anritsu, Finisar, EXFO, APEX technologies etc.įollowing table summarizes popular vendors or manufacturers of OSA.The single- and double-layered photodetectors based on ZnO and/or detonation nanodiamond (DND) ha. There are different Vendors of Optical Spectrum Analyzer (OSA). Ramp tunes optical filter such that its resonant wavelength is.This signal is applied to vertical part of display unit as amplitude. Later this is digitized using ADC converter in the Optical Spectrum Analyzer.The current is converted into equivalent voltage using transimpedance.This electrical current magnitude is proportional to incident optical power. Photodetector converts optical signal into electrical equivalent signal.This optical filter resolves different spectral components
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Incoming optical signal to be measured is passed through.
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Let us understand functions of each of the modules of OSA. The figure-2 depicts simple block diagram of Optical Spectrum Analyzer. Refer DWDM tutorial to know more on DWDM. The main application of OSA is to troubleshoot problems in DWDM systems. The measured variable of OSA is usually light intensity.įigure-1 depicts Optical Spectrum Analyzer model number AQ6375B from Yokogawa Electric Corporation. It measures properties of light over range of electromagnetic spectrum. Similarly for measurement of optical signal, optical spectrum analyzer(OSA) is needed. Here X-axis is electromagnetic radio frequency and Y-axis is the power. Popular vendors of Optical Spectrum Analyzer are also mentioned.Īs we know RF spectrum analyzer is used to view and diagnose RF signals over frequency bands. It mentions function of Optical Spectrum Analyzer(OSA) including block diagram. This page covers application note on Optical Spectrum Analyzer(OSA). Optical Spectrum Analyzer function | OSA Application Note