• Title/Summary/Keyword: nano beam

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Alignment Algorithm for Nano-scale Three-dimensional Printing System (나노스케일 3 차원 프린팅 시스템을 위한 정렬 알고리즘)

  • Jang, Ki-Hwan;Lee, Hyun-Taek;Kim, Chung-Soo;Chu, Won-Shik;Ahn, Sung-Hoon
    • Journal of the Korean Society for Precision Engineering
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    • v.31 no.12
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    • pp.1101-1106
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    • 2014

  • Hybrid manufacturing technology has been advanced to overcome limitations due to traditional fabrication methods. To fabricate a micro/nano-scale structure, various manufacturing technologies such as lithography and etching were attempted. Since these manufacturing processes are limited by their materials, temperature and features, it is necessary to develop a new three-dimensional (3D) printing method. A novel nano-scale 3D printing system was developed consisting of the Nano-Particle Deposition System (NPDS) and the Focused Ion Beam (FIB) to overcome these limitations. By repeating deposition and machining processes, it was possible to fabricate micro/nano-scale 3D structures with various metals and ceramics. Since each process works in different chambers, a transfer process is required. In this research, nanoscale 3D printing system was briefly explained and an alignment algorithm for nano-scale 3D printing system was developed. Implementing the algorithm leads to an accepted error margin of 0.5% by compensating error in rotational, horizontal, and vertical axes.

  • https://doi.org/10.7736/KSPE.2014.31.12.1101 인용 PDF KSCI

Color modification inside a transparent glass(BK7) using a femtosecond laser (펨토초 레이저 기반 투명유리(BK7) 내부의 컬러 미세형상 가공)

  • Kim, Hoon-Young;Yoon, Ji-Wook;Choi, Won-Seok;Park, Jung-Kyu;Choi, Ji-Yeon;Kim, Jae-Goo;Whang, Kyoung-Hyun;Cho, Sung-Hak
    • Laser Solutions
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    • v.15 no.3
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    • pp.16-19
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    • 2012

  • We have successfully formed brown colored patterns inside of a transparent borosilicate glass generally known as BK7, laying the focus of near infrared Ti: sapphire femtosecond laser beam in the bulk BK7 glass. It is important to keep the laser power well below the damage threshold of BK7 in forming the color center. According to the low laser power, there was no laser induced mechanical damage such as cracks or threads in the color formed area. From the absorbance spectrum and its gaussian fitting, we found the band gap of BK7, 4.21eV, and three absorption edges.

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Buckling analysis of perforated nano/microbeams with deformable boundary conditions via nonlocal strain gradient elasticity

  • Ugur Kafkas;Yunus Unal;M. Ozgur Yayli;Busra Uzun
    • Advances in nano research
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    • v.15 no.4
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    • pp.339-353
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    • 2023

  • This work aims to present a solution for the buckling behavior of perforated nano/microbeams with deformable boundary conditions using nonlocal strain gradient theory (NLSGT). For the first time, a solution that can provide buckling loads based on the non-local and strain gradient effects of perforated nanostructures on an elastic foundation, while taking into account both deformable and rigid boundary conditions. Stokes' transformation and Fourier series are used to realize this aim and determine the buckling loads under various boundary conditions. We employ the NLSGT to account for size-dependent effects and utilize the Winkler model to formulate the elastic foundation. The buckling behavior of the perforated nano/microbeams restrained with lateral springs at both ends is studied for various parameters such as the number of holes, the length and filling ratio of the perforated beam, the internal length, the nonlocal parameter and the dimensionless foundation parameter. Our results indicate that the number of holes and filling ratio significantly affect the buckling response of perforated nano/microbeams. Increasing the filling ratio increases buckling loads, while increasing the number of holes decreases buckling loads. The effects of the non-local and internal length parameters on the buckling behavior of the perforated nano/microbeams are also discussed. These material length parameters have opposite effects on the variation of buckling loads. This study presents an effective eigenvalue solution based on Stokes' transformation and Fourier series of the restrained nano/microbeams under the effects of elastic medium, perforation parameters, deformable boundaries and nonlocal strain gradient elasticity for the first time.

  • https://doi.org/10.12989/anr.2023.15.4.339 인용

Post etch process using CO/NH3 and Reactive Ion Beam for STT-MRAM device

  • Park, Seong-U;Yang, Gyeong-Chae;Jeon, Min-Hwan
    • Proceedings of the Korean Institute of Surface Engineering Conference
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    • 2015.05a
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    • pp.38-38
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    • 2015

  • 차세대 메모리로 각광받고 있는 STT-MRAM의 동작특성을 향상시키기 위하여 식각 시 재 증착되는 식각 부산물을 저 손상을 제거하였다.

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