Professor Si-Chen Lee

Graduate Institute of Photonics and Optoelectronics, National Taiwan University

台湾大学光电所 李嗣涔教授

• “Localized shape resonance on silver film perforated by H-shaped and more complex shaped hole arrays”, Hao-Fu Huang, Yu-Wei Jiang, Hung-hsin Chen, Yi-Ting Wu, Yi-Tsung Chang, Fang-Tzu Chuang, and Si-Chen Lee, Optics express, Vol. 19, Iss. 6, pp. 5225–5231 (2011).

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  Fig. 1 (a) Top view and structure parameter of samples 1 to 3. (b) Zero-order transmission spectra at normal incidence of samples 1, 2, 3. The vertical red dash line represents the theoretical position of degenerated (1, 0) Ag/Si mode.

   

• “Wavelength Selective Plasmonic Thermal Emitter by Polarization Utilizing Fabry-Pèrot Type Resonances”, Pei-En Chang, Yu-Wei Jiang, Hung-Hsin Chen, Yi-Tsung Chang, Yi-Ting Wu, Lawrence Tzuang, Yi-Han Ye and Si-Chen Lee, Appl. Phys. Lett., 98, 073111 (2011).

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  Fig. 2 The schematic view of (a) a MIM PTE with rectangular metallic patch arrays as top layer. (b) Emittance spectra of three samples with all dx equal to 2 mm and dy = 3, 4 and 5 mm, respectively. The LSP (1, 0) and (0, 1) modes are at wavelength of about 6 mm and 8 mm, respectively. The green dotted curve is a fit of LSP (0, 1) to a Sin2θ dependence, while the blue fit curve of LSP (1, 0) to a Cos2θ dependence.

   

• “Hydrogenated Amorphous Silicon Solar Cell on Glass Substrate pattered by Hexagonal Nano-Cylinder Array”, Wei-Chen Tu, Yi-Tsung Chang, Chieh-Hung Yang, Dan-Ju Yeh, Chung-I Ho and Si-Chen Lee, Appl. Phys. Lett., 97, 193109 (2010).

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  Fig. 3 The SEM pictures of (a) the side view of the patterned solar cell on nano-cylinder array glass substrate. (b) The top view of the patterned solar cell after completion. (c) Measured EQE of flat and patterned solar cells.

Modal Characteristics of Antiresonant Reflecting Pipe Waveguides for Terahertz Waveguiding

Professor Hung-chun Chang

Graduate Institute of Photonics and Optoelectronics, National Taiwan University

台湾大学光电所 张宏钧教授

The pipe waveguide is promising for terahertz (THz) waveguiding owing to its low-loss feature and simple structure. In this work, modal characteristics of the leaky core modes of the pipe waveguide are investigated in the THz range. Utilizing the finite-difference frequency-domain (FDFD) mode solver, modal indices and attenuation constants of the core modes which are frequency dependent are calculated for different core diameters, cladding thicknesses, and cladding refractive indices. It is found that at certain frequencies no core modes can exist. Comparing these frequencies with the resonant frequencies of the cladding reveals that the guiding mechanism of the core modes is that of the antiresonant reflecting guiding. Calculated results also suggest that, to have a low-loss and high-bandwidth pipe waveguide, large core diameter, thin cladding thickness, and low refractive index are desired. The effect of material absorption is also examined, which shows that the attenuation constant magnitude will be increased and the increment is more significant at higher frequencies. Moreover, modal patterns are shown for the fundamental mode and the higher order modes, including modal intensity distributions and electric field vector distributions. It is observed that modal patterns of the core modes of the pipe waveguide resemble those of the guided modes of the step-index fiber. From the spectrum of the attenuation constant, it shows that the fundamental mode (HE₁₁-like) has the smallest attenuation constant and is the dominant mode for the pipe waveguide investigated. Using time-domain spectroscopy to measure the transmission spectra of PMMA pipes in collaboration with Prof. Chi-Kuang Sun, guiding mechanism of the pipe waveguides was experimentally confirmed to be that of antiresonant reflecting guiding. (Optics Express, vol. 18, no. 1, pp. 309–322, 22 January 2010.)

姓名：李正匡   指导教授：杨志忠教授

论文题目：近红外光超荧光二极管

姓名：郭适豪   指导教授：孙启光教授

— 数据提供：影像显示科技知识平台 (DTKP, Display Technology Knowledge Platform) —

— 整理：林晃岩教授、陈韦仲 —

日本产业技术综合研究所(产综研)开发出可检测人体动作的CNT应变传感器 

日本产业技术综合研究所（产综研）奈米管应用研究中心的Super Growth CNT研究小组主任研究员山田健郎，开发出了利用单层奈米碳管（CNT）的可弯曲性应变传感器。藉由黏贴在衣服与身体上，可检测膝盖屈伸、手指活动及呼吸发声等人体动作。可望应用于医疗与保健领域，例如进行复健治疗时，在不妨碍患者活动的情况下做各种动作的监控。此研究已刊登在学术杂志「Nature Nanotechnology」的网络版上，未来有机会迈向组件的实际应用。

该应变传感器将已对齐的单层CNT薄膜黏贴在具伸缩性的高分子基板上，并利用CNT膜的电阻变化做应变的检测，可检测大到280％的应变，产综研表示，该检测能力相当于「原金属制应变传感器的将近50倍」。对于150％以下的应变，该传感器具有可使用1万次以上的耐久性。另外，该传感器对于应变的响应时间为14 ms，「在可测量100％以上大型应变传感器中，该产品的速度最快」（产综研）。

传统金属应变传感器可弯曲程度较差，在测量人体动作时会有动作受限的问题（可检测的应变为5％左右）。虽然市面上另外有采用导电性材料及高分子复合材料的应变传感器，但当发生剧烈应变时就会出现蠕变变形，「变形后恢复至可测量应变的稳定状态需费时100 s以上的时间」（产综研）。此次的传感器除了前面提到的可弯曲程度较高之外，与采用导电性材料及高分子复合材料的传感器相比，蠕变的恢复速度也提高了20倍以上。

产综研奈米管应用研究中心开发出含碳纯度较高的单层CNT合成法—「Super Growth法」，使单层CNT的应用开发有了进一步的发展。将垂直对齐的长尺寸单层CNT薄膜进行高密度处理，使其安置在Si晶圆上，成功制作出了高密度对齐CNT晶圆。此次透过将这种高密度对齐CNT晶圆并以任意对齐方向黏贴在可弯曲性高分子基板的任意位置，进而制作出可弯曲组件。