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RISS 인기검색어
- 검색키워드
- 저자 : M. Sathish Kumar (검색결과 4 건)
- 무료
- 기관 내 무료
- 유료
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Out of plane mode conversion and manipulation of Surface Plasmon Polariton Waves
Kumar, M. Sathish,Piao, Xianji,Koo, Sukmo,Yu, Sunkyu,Park, Namkyoo The Optical Society 2010 Optics express Vol.18 No.9
<P>We propose a rigorous design method of structured gratings for out of plane mode conversion, line focusing and manipulation of Surface Plasmon Polariton (SPP) waves. Employing a blazed grating to incorporate the directionality of SPP launch, and at the same time controlling grating depth and chirp to account for the radiation loss and diffraction angle, it was possible to achieve high efficiency and flexible SPP to freespace mode conversion. Devices with advanced functionalities, such as balanced SPP power splitter, and SPP wavelength demultiplexer are demonstrated with over 75% of power efficiencies at reasonable working distances of less than several wavelengths.</P>
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금속 나노갭과 나노선에서의 특이 장 집속도 향상에 대한 유전체 기판의 영향
구석모,M. Sathish Kumar,박남규 한국물리학회 2010 새물리 Vol.60 No.1
Recently, researching extraordinary optical transmission phenomena based on the metallic structure has become popular because of its ability to break the diffraction limit. Most of the metamaterial structures in these experiments were on dielectric substrates because the difficulty in making free-standing metallic nanostructures. In this research, a finite-difference time-domain (FDTD) analysis was performed on the effect of the substrate on extraordinary field enhancement in metallic nanogap and nanowire structures and confirmed that, in contrast to the reduced electric field enhancement in nanogaps caused by the dielectric substrate, the effect of the dielectric substrate on the magnetic field enhancement was negligible. 최근 금속으로 이루어진 구조에서의 특이 광 투과현상에 대한 연구가 활발한데, 이는 이 구조가 회절 한계를 극복할 수 있기 때문이다. 이에 대한 실험 연구를 위한 메타 물질은 대부분 유전체 기판 위에 올려져 있는데, 이는 금속을 프리 스탠딩 (free standing) 상태로 만들기가 매우 어렵기 때문이다. 본 논문에서는 유전체 물질이 나노갭 (Nanogap)과 나노선 (Nanowire) 구조에서 특이 광 집속도 향상에 어떠한 영향을 주는지 분석하였다. 나노갭에서의 전기장 향상은 유전체 기판에 의해서 줄어드는 반면에 나노선에서의 자기장 향상은 영향이 없음을 분석하고 FDTD 전산모사로 이를 확인하였다.
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B. Adil,K. M. Shankar,B. T. Naveen Kumar,Rajreddy Patil,Abhiman Ballyaya,K. S. Ramesh,Sathish Rama Poojary,Omkar V. Byadgi,Prabhugouda Siriyappagouder 대한수의학회 2013 Journal of Veterinary Science Vol.14 No.4
A monoclonal antibody-based flow-through immunoassay (FTA) was developed using a nitrocellulose membrane placed on the top of adsorbent pads enclosed in a plastic cassette with a test zone at the center. The FTA could be completed within 10 min. Clear purple dots against a white background indicated the presence of Aphanomyces (A.)invadans. The FTA limit of detection was 7 μg/mL for A. invadans compared to 56 μg/mL for the immunodot. FTA and polymerase chain reaction (PCR) could detect A. invadans in fish tissue homogenates at a 10-11 dilution compared to a 10-8 dilution by immunodot. In fish suffering from natural cases of epizootic ulcerative syndrome (EUS)collected from Mangalore, India, FTA and PCR could detect A. invadans in 100% of the samples compared to 89.04%detected by immunodot. FTA reagents were stable and produced expected results for 4 months when stored at 4∼8oC. This rapid test could serve as simple and cost-effective on-site screening tool to detect A. invadans in fish from EUS outbreak areas and in ports during the shipment of live or frozen fish.
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Mechanical, Thermal and Electromagnetic Shielding Effectiveness of MWCN-ABS Films
R. B. Jagadeesh Chandra,B. Shivamurthy,M. Sathish Kumar,B. H. S. Thimmappa 한국전기전자재료학회 2022 Transactions on Electrical and Electronic Material Vol.23 No.3
The multi-walled carbon nanotubes (MWCNTs) and the poly(acrylonitrile-co-butadiene-co-styrene) (ABS) granulates are dispersed in acetone separately using a magnetic stirrer followed by ultrasonication. Further, both the solutions were mixed with magnetic stirring followed by ultrasonication. Neat-ABS film, 0.25 wt%, 0.5 wt% and 1 wt% of MWCNT-ABS nanocomposite films of the average thickness of 140 μm are fabricated by the solution molding using a petri dish, followed by room temperature curing and further hot compression to maintain uniform thickness. The tensile properties, thermal stability, electrical conductivity, and EMSE of all films are investigated. The results indicate that the addition of MWCNTs to ABS enhanced the mechanical properties and electrical conductivity, thermal stability, and EMSE. The 0.25 wt% MWCNT-ABS nanocomposite films show attractive mechanical, electrical, thermal, and EMSE as compared to neat-ABS fi lms. More than 0.25 wt% MWCNTs in the ABS matrix deteriorates the tensile strength. However, 0.5 wt% MWCNT-ABS nanocomposites exhibit better tensile strength, Young’s modulus, electrical conductivity, and EMSE than neat-ABS. In this research, we used a low quantity of MWCNTs and followed a one-time heating process in the entire fabrication, and produced MWCNT-ABS nanocomposite films with reasonable properties. Hence, this may be one of the options to produce nanocomposites suitable for EMS materials. We recommend that these films may be used as interlayers to develop an X-band range electromagnetic wave shielding material.
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