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Phonon transmission of vacancy disordered armchair silicene nanoribbon

Optoelectronics Letters 2021年第8期17卷 454-458页

作者： Ashraful Hossain Howlader md.sherajul islam Naim Ferdous School of Physics The University of SydneyNew South Wales 2006Australia Department of Electrical and Electronic Engineering Khulna University of Engineering and TechnologyKhulna 9203Bangladesh Department of Electrical and Electronic Engineering Bangabandhu Sheikh Mujibur Rahman Science and Technology UniversityGopalganj 8100Bangladesh

This work demonstrates the atomic vacancy effects on the phonon properties of armchair silicene nanoribbon in a step by step process for the first *** phonon localization effect figures out the fact that vacancies cause to high-energy phonons become localized,whereas low-energy phonons can easily *** vacancy reduces high-energy phonon transmission severely compared to low-energy *** is also found from phonon density of states that high-frequency phonons soften towards the low-frequency *** simulated phonon bandstructure verifies that most of the phonon branches transform to a nondegenerate state from a degenerate state and shifted toward a lower frequency regime due to the presence of *** overall consequences of atomic vacancies on the phonon thermal conductance disclose the reality that only a few atomic vacancies result in a vital reduction of phonon thermal *** addition,the entropy of the disordered system is investigated.

关键词： phonon vacancy disordered

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Proposal for dispersion compensating square-lattice photonic crystal fiber

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Optoelectronics Letters 2021年第3期17卷 160-164页

作者： Ashraful Hossain Howlader md.sherajul islam S.M.A.Razzak Department of Electrical and Electronic Engineering Rajshahi University of Engineering and TechnologyRajshahi 6204Bangladesh Department of Electrical and Electronic Engineering Khulna University of Engineering and TechnologyKhulna 9203Bangladesh Department of Electrical and Electronic Engineering Bangabandhu Sheikh Mujibur Rahman Science and Technology UniversityGopalganj 8100Bangladesh

A dispersion-compensating square-lattice photonic crystal fiber for broadband compensation which covers the S, C and L communication bands, i.e. wavelength ranging from 1 460 nm to 1 625 nm is proposed in this paper. Theoretically, it is shown a negative dispersion coefficient of about-595 ps/(nm·km) to-1 288 ps/(nm·km) over S to L bands and-975 ps/(nm·km) at the operating wavelength 1 550 nm. The relative dispersion slope is perfectly matched to that of conventional single-mode fiber of about 0.003 6 nm^(-1). Besides the proposed photonic crystal fiber shows the large nonlinear coefficient of 61.88 W/km at the operating wavelength of 1 550 nm. Moreover, the variation of structural parameters is also studied and discussed here.

关键词： fiber dispersion crystal

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