【摘 要】
：
Raman spectroscopy has been widely used to characterize the physical properties of two-dimensional materials(2DMs).The signal-to-noise ratio (SNR or S/N ratio) of Raman signal usually serves as an important indicator to evaluate the instrumental performan
【机 构】
：
State Key Laboratory of Superlattices and Microstructures,Institute of Semiconductors,Chinese Academ
论文部分内容阅读
Raman spectroscopy has been widely used to characterize the physical properties of two-dimensional materials(2DMs).The signal-to-noise ratio (SNR or S/N ratio) of Raman signal usually serves as an important indicator to evaluate the instrumental performance rather than Raman intensity itself.Multichannel detectors with outstanding sensitivity,rapid acquisition speed and low noise level have been widely equipped in Raman instruments for the measurement of Raman signal.In this mini-review,we first introduce the recent advances of Raman spectroscopy of 2DMs.Then we take the most commonly used CCD detector and IGA array detector as examples to overview the various noise sources in Raman measurements and analyze their potential influences on SNR of Raman signal in experiments.This overview can contribute to a better understanding on the SNR of Raman signal and the performance of multichannel detector for numerous re-searchers and instrumental design for industry,as well as offer practical strategies for improving spectral quality in routine measurement.
其他文献
We investigate the entanglement dynamics of two distinguishable two-level systems (TLSs) characterized by energy difference δ located inside a rectangular hollow metallic waveguide of transverse dimensions a and b.The effects of energy difference δ and th
Since Yukawa proposed that the pion is responsible for mediating the nucleon-nucleon interaction,meson ex-changes have been widely used in understanding hadron-hadron interactions.The most studied mesons are the σr,π,ρ,and ω,while other heavier mesons are
Quantum speed limit and entanglement of a two-spin Heisenberg XYZ system in an inhomogeneous external magnetic field are investigated.The physical system studied is the excess electron spin in two adjacent quantum dots.The influences of magnetic field inh
We report the production of 87Rb Bose-Einstein condensate in an asymmetric crossed optical dipole trap(ACODT) without the need of an additional dimple laser.In our experiment,the ACODT is formed by two laser beams with different radii to achieve efficient
Exploring two-dimensional (2D) magnetic heterostructures is essential for future spintronic and optoelectronic de-vices.Herein,using first-principle calculations,stable ferromagnetic ordering and colorful electronic properties are es-tablished by construc
Two-dimensional (2D) magnetic materials have aroused tremendous interest due to the 2D confinement of magnetism and potential applications in spintronic and valleytronic devices.However,most of the currently 2D magnetic materials are achieved by the exfol
Signatures of topological superconductivity (TSC) in superconducting materials with topological nontrivial states prompt intensive researches recently.Utilizing high-resolution angle-resolved photoemission spectroscopy and first-principles calculations,we
We propose an optimized cluster density matrix embedding theory (CDMET).It reduces the computational cost of CDMET with simpler bath states.And the result is as accurate as the original one.As a demonstration,we study the distant correlations of the Heise
Based on a femtosecond laser plasma-induced hard x-ray source with a high laser pulse energy (＞ 100 m J) at 10 Hz repetition rate,we present a time-resolved x-ray diffraction system on an ultrafast time scale.The laser intensity is at relativistic regime
It is well known that in the process of thermal oxidation of silicon,there are Pb-type defects at amorphous silicon dioxide/silicon (a-SiO2/Si) interface due to strain.These defects have a very important impact on the performance and reliability of semico