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Cho, E.,Choi, S.,Shim, J.,Kim, T.,Shin, R.,Lee, J.,Kim, J.,Jung, H.I.,Kang, S. Elsevier Sequoia 2016 Sensors and actuators. B Chemical Vol.233 No.-
We demonstrate the use of a parallel detection system with a nanograting-based microarray to accomplish high-throughput analysis of bio-molecular interactions in a label-free manner. Well-type label-free microarrays were fabricated to eliminate the risk of cross-contamination and to minimize sample volumes. Parallel analysis without the use of spectrometer arrays or a moving platform was accomplished by using scanning multiple optical probes generated by a spatial light modulator and microlens array. Additionally, multiple optical probe spots focused by the microlens array reduced detection errors while enhancing the signal-to-noise ratio within a high-density microarray. Finally, we verified the feasibility of the parallel detection system by analyzing the peak wavelength value (PWV) shift of human salivary cortisol and anti-cortisol in a competitive binding experiment.
Gwon, Minji,Lee, Y. U.,Wu, J. W.,Nam, Dahyun,Cheong, Hyeonsik,Kim, Dong-Wook American Chemical Society 2014 ACS APPLIED MATERIALS & INTERFACES Vol.6 No.11
<P>In this study, we observed that the photoluminescence (PL) intensity of ZnO/Ag nanogratings was significantly enhanced compared with that of a planar counterpart under illumination of both transverse magnetic (TM) and transverse electric (TE)-mode light. In the TM mode, angle-resolved reflectance spectra exhibited dispersive dips, indicating cavity resonance as well as grating-coupled surface plasmon polariton (SPP) excitation. In the TE mode, cavity resonance only was allowed, and broad dips appeared in the reflectance spectra. Strong optical field confinement in the ZnO layers, with the help of SPP and cavity modes, facilitated polarization-insensitive PL enhancement. Optical simulation results were in good agreement with the experimental results, supporting the suggested scenario.</P><P><B>Graphic Abstract</B> <IMG SRC='http://pubs.acs.org/appl/literatum/publisher/achs/journals/content/aamick/2014/aamick.2014.6.issue-11/am5014024/production/images/medium/am-2014-014024_0008.gif'></P><P><A href='http://pubs.acs.org/doi/suppl/10.1021/am5014024'>ACS Electronic Supporting Info</A></P>
펨토초 레이저 펄스 스캔에 의한 ZnO와 GaN 표면의 나노구조 형성
김대진,임기수,손익부 한국물리학회 2017 New Physics: Sae Mulli Vol.67 No.7
반복율 1 kHz이고 파장이 800 nm인 펨토초 레이저 빔을 GaN와 ZnO의 반도체 결정의 표면에 집속하고 스캔함으로써 자체 배열된 나노 격자를 형성하였다. 격자의 주기는 GaN 표면에서 약 600 nm와 ZnO 표면에서 약 200 nm로 측정되었다. 격자주기는 레이저 스캔 속력과 레이저 펄스의 에너지 증가에 따라 증가하는 경향을 보였다. 격자는 선형 레이저 편광과 수직으로 배열되었다. GaN의 표면은 높은 플라스마 밀도로 인해 금속 표면의 나노 격자와 유사한 특성을 보였고, 반면에 ZnO표면은 유전체의 나노 격자와 비슷한 특성을 보였다. 이러한 차이는 비록 두 물질의 밴드 갭은 거의 차이가 없지만 다광자 흡수계수와 내부 결함에 의한 전자밀도의 큰 차이에 기인한 것으로 보인다. We report self-organized nanogratings formed on the surfaces of ZnO and GaN crystals by scanning a focused femtosecond laser beam at 800 nm with a repetition rate of 1 kHz. The period of the grating structure was about 600 nm on the GaN surface and about 200 nm on the ZnO surface and increased with increasing scan speed and laser pulse energy. The grating was oriented perpendicular to the direction of the linear laser's polarization. The nanogratings on the GaN surface showed metal-like characteristics due to the high plasma density while those on the ZnO surface showed dielectric-like characteristics. This could be due to the electron densities for the two surfaces being very different as a result of differences in their multiphoton absorption coefficients and internal defects, even though their band gaps were almost the same.
On-Chip Break Junctions and Period-Adjustable Grating Driven by Thermal Stress
Ling Wang,Zhikai Zhao,Dong Xiang 성균관대학교(자연과학캠퍼스) 성균나노과학기술원 2017 NANO Vol.12 No.11
"The investigation of the electron transport through single molecule needs an efficient method to generate stable molecular junctions. There are various techniques, such as mechanically controllable break junction (MCBJ) technique and electromigration technique, to generate stable nanogaps and stable molecular junctions. However, it is a great challenge for MCBJ technique to obtain on-chip molecular junctions because of the constraint of the push rod components, which do not make it facile to fabricate highly integrated molecular devices. Meanwhile, the gap size between electrodes is nonadjustable for the electromigration method, which leads to a low yield of molecular junctions. In this report, a thermally controllable break junction method, which can overcome the above problem, is proposed for the first time. The device is based on a double-V-shaped symmetrical structure and mechanically driven by thermal expansion, thus the push rod is not needed. Furthermore, we proposed that the thermally controlled double-V-shaped structure can be employed to precisely adjust the period of the metal grating with nanometer accuracy, which is unavailable in other methods. "
허유라(Youra Heo),조익현(Eikhyun Cho),강신일(Shinill Kang) 한국생산제조학회 2011 한국생산제조시스템학회 학술발표대회 논문집 Vol.2011 No.4
Guided mode resonance protein chips are capable of high sensitivity in the detection of molecular interactions, by measuring the movement of sharp transmittance peak. We designed a guided mode resonance protein chip by computer simulation based on rigorous coupled wave analysis, and created a prototype by UV nano imprinting. We also demonstrated the use of the guided mode resonance protein chip as a protein sensor by verifying the formation of peak wavelength value and the shift of the peak due to biotin and streptavidin interactions.