• Title/Summary/Keyword: 주사 탐침 현미경

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An Experiment about Assembling Condition of Carbon Nanotube Tip for AFM (주사탐침현미경용 카본나노튜브 팁의 조립 조건 실험)

  • 박준기;한창수
    • Proceedings of the Korean Society of Precision Engineering Conference
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    • 2004.10a
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    • pp.501-504
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    • 2004
  • This paper describes the fabrication method for atomic force microscopy(AFM) tip with multi-walled carbon nanotube(MWNT). For making a carbon nanotube (CNT) modified tips, AC electric field which cause the dielectrophoresis was used for alignment and deposition of CNTs in this research. By dropping the MWNT solution and applying an electric field between an AFM tip and an electrode, MWNTs which were dispersed into a diluted solution were directly assembled onto the apex of the AFM tips due to the attraction by the dielectrophoretic force. In this case, we investigate the effect of the angle between a tip axis and an electrode. Experimental setup were presented, and then CNT attached AFM tips are successfully shown in this paper.

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Measurement of surface plasmon using near-field scanning optical microscope (근접장 주사 광학 현미경을 이용한 표면 플라즈몬의 측정)

  • 고선아;이관수;박승룡;윤재웅;송석호;김필수;오차환
    • Korean Journal of Optics and Photonics
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    • v.15 no.1
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    • pp.51-55
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    • 2004
  • Surface plasmons (SPs) are charge density oscillations that propagate along an interface between a dielectric and metal. In this paper, the electric field of SPs and the intereference of two SPs are observed by using Near-field Scanning Optical Microscope (NSOM). The excitation condition of SPs is changed as the optical tip approaches the metal surface, because the excitation condition of SPs is very sensitive to surface structures. To measure the microscope field of SPs, the distance between metal surface and optical tip must contain a specific interval.

Direct Patterning of Functional Molecules using Scanning Probe Microscope (주사탐침현미경을 이용한 기능성분자 패터닝)

  • Yun, Wan-Soo;Suck, Sung-Dae;Park, Hyung-Ju;Ha, Dong-Han;Chang, Won-Seok;Shin, Bo-Sung
    • Proceedings of the KSME Conference
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    • 2003.04a
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    • pp.1048-1051
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    • 2003
  • 주사탐침현미경 (Scanning Probe Microsope, SPM)을 이용하여 직접 패터닝을 함으로써 hexanedithiol 분자의 임의 패턴을 금 표면에 형성하였다. 또한, hexanedithiol 분자는 양단에 thiol 그룹이 존재하여 금과 안정화 화학결합을 이룰 수 있으므로, 금 표면과결합을 이루고 있지 않는 상단의 thiol 그룹에 금 나노 입자를 고정함으로써 나노입자의 패턴을 제작하였다. SPM을 이용한 직접 패터닝 방법은 분자활성을 유지한 채로 임의 패턴을 수십 nm의 선폭으로 구현하는 것이 가능하므로, 나노입자 배열뿐만 아니라, 생화학물질의 패터닝을 통한 바이오 기술연구, 레지스트용 분자 패터닝과 시각 및 흡착 등의 계속적인 공정을 통한 다양한 나노구조 제작 등에 폭넓게 활용될 수 있다.

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Cross Sectional Thermal and Electric Potential Imaging of an Operating MOSFET (작동중인 모스 전계 효과 트랜지스터 단면에서의 상대온도 및 전위 분포 측정)

  • Kwon, Oh-Myoung
    • Transactions of the Korean Society of Mechanical Engineers B
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    • v.27 no.7
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    • pp.829-836
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    • 2003
  • Understanding of heat generation in semiconductor devices is important in the thermal management of integrated circuits and in the analysis of the device physics. Scanning thermal microscope was used to measure the temperature and the electric potential distribution on the cross-section of an operating metal-oxide-semiconductor field-effect transistor (MOSFET). The temperature distributions were measured both in DC and AC modes in order to take account of the leakage current. The measurement results showed that as the drain bias was increased the hot spot moved to the drain. The density of the iso-potential lines near the drain increased with the increase in the drain bias.

Diffraction by a sub-wavelength-sized aperture in a metal plane (파장보다 작은 금속 구멍을 통한 회절)

  • ;;Arturo Chavez-Pirson
    • Proceedings of the Optical Society of Korea Conference
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    • 2000.02a
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    • pp.164-165
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    • 2000
  • 구멍에 의한 빛의 회절은 광학의 기본적인 문제로서, 최근 근접장 광학(Near-Field Optics)의 발전과 더불어서 파장보다 작은 구멍에서 일어나는 빛의 회절에 대한 관심이 고조되고 있다.$^{(1)(2)(3)}$ 본 연구에서는 그동안 주로 이론적으로 다루어지고 있던 파장보다 작은 금속 구멍을 통한 빛의 회절에 대해 실험결과들을 보고한다. 회절된 빛의 먼장(Far-field)과, 근접장(Near-field)을 모두 측정하기 위해서 고체각 주사기(Solid angle scanner)와 근접장 주사 광학 현미경(Near-field Scanning Optical Microscopy)이 사용되었다. 고체각 주사기(Solid angle scanner)를 사용하여 반구면 위에서의 빛의 이차원 세기 분포가 다양한 편광 상태에 따라서 측정되었고$^{(4)}$ 근접장 탐침(NSOM probe)으로 작은 금속 구멍주변을 주사함으로서 근접장이 측정되었다. 작은 구멍은 최근에 개발된 고출력 근접장 광섬유 탐침(High-power near-field fiber probe)구조를 이용하여 제작되었다.$^{(5)}$

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Fabrication of the photon scanning tunneling microscope with constant intensity mode (일정광량 방식의 광자주사현미경 제작)

  • Kim, Ji-Taek;Choi, Wan-Hae;Jo, Jae-Heung;Chang, Soo;Kim, Dal-Hyun;Koo, Ja-Yong;Chung, Seung-Tae
    • Korean Journal of Optics and Photonics
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    • v.10 no.3
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    • pp.195-200
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    • 1999
  • We made sharp optical fiber tips with less than 100 nm diameter by using the heating and pulling method with a good repetition and fabricated the photon scanning tunneling microscope (PSTM) using constant intensity mode. The 3-dimensional PZT (Piezoelctric transducer) scanner made of a long PZT tube is consisted of three divided parts, that is, a pair of $\pm$ x and a pair of $\pm$y scanning parts and a z scanning part for the fine approach and scanning. The scanning dimension is 1.43 $\mu\textrm{m}$$\times$1.76 $\mu\textrm{m}$. The height of a optical tip to maintain a constant height within $1/{\lambda}_0$ (${\lambda}_0$ is the incident wavelength) from surface of a specimen to a optical tip is controlled automatically by using the electric feedback circuit. The 3-dimensional shape of standing evanescent waves generated on the surface of a dove prism was measured successfully by using the constant intensity mode PSTM.

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Atomic Force Microscopy(AFM) based Single Cell Manipulation and High Efficient Gene Delivery Technology (원자간력 현미경을 이용한 단일세포 조작 및 고효율 유전자 도입기술)

  • Han, Sung-Woong;Nakamura, Chikashi;Miyake, Jun;Kim, Woo-Sik;Kim, Jong-Min;Chang, Sang-Mok
    • Korean Chemical Engineering Research
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    • v.47 no.5
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    • pp.538-545
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    • 2009
  • The principle and application of a scanning probe microscopy(SPM) are reviewed briefly, and a low-invasive single cell manipulation and a gene delivery technique using an etched atomic force microscopy(AFM) probe tip, which we call a nanoneedle, are explained in detail. The nanoneedle insertion into a cell can be judged by a sudden drop of force in a force-distance curve. The probabilities of nanoneedle insertion into cells were 80~90%, which were higher than those of typical microinjection capillaries. When the diameter of the nanoneedle was smaller than 400 nm, the nanoneedle insertion into a cell over 1 hour had almost no influence on the cell viability. A highly efficient gene delivery and a high ratio of expressed gene per delivered DNA compared the conventional major nonviral gene delivery methods could be achieved using the gene modified nanoneedle.

A study on light propagation in near-field optical probes (근접장 광학 탐침내의 도파에 관한 연구)

  • 정승태;신동재;이용희
    • Proceedings of the Optical Society of Korea Conference
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    • 2000.02a
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    • pp.162-163
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    • 2000
  • 근접장 주사 광학 현미경(Near-field scanning optical microscope)에서 가장 중요한 부분은 바로 근접장 탐침(Near-field optical probe)이다. 가간 널리 사용되는 근접장 탐침은 끝 부분에 매우 작은 구멍만 남기고 나머지 부분은 금속으로 코팅한 뾰족한 광섬유(Metal-clad tapered optical fiber)이다. 탐침의 끝에 형성된 작은 구멍은 진행하지 못하는 근접장(Near-field)을 진행하는 먼장(Far-field)으로 바꾸어줌으로서 회절한계를 뛰어넘는 분해능을 가능하게 한다. 그러나, 이러한 작은 구멍은 매우 작은 투과 효율(Transmission efficiency)을 가지기 때문에 고밀도 광기록(High-density optical recording)등에 이용하는데 큰 어려움이 있었다.$^{(1).(3)}$ 따라서 금속이 코팅된 뾰족한 광섬유 내에서 빛이 어떻게 진행되는지에 대한 연구를 통해 보다 높은 효율을 가지는 근접장 탐침을 개발하는 것이 중요한 과제가 되고 있다. 본 연구에서는 금속이 코팅된 뾰족한 광섬유 도파로 내에서 구멍의 크기와 빛의 투과 효율의 관계를 보고한다. (중략)

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