https://ir.lib.ncu.edu.tw/handle/987654321/335 Search the Channel s https://ir.lib.ncu.edu.tw/simple-search https://ir.lib.ncu.edu.tw/handle/987654321/49953 title: Optimal design of a microcavity organic laser device under electrical pumping abstract: The quality factor of microcavity organic lasers, designed for operation under electric pumping, has been numerically investigated. The microcavity structure consists of an organic light emitting diode set in between multilayer dielectric mirrors centered for an emission at 620 nm. In order to optimize the quality factor, different parameters have been studied: the impact of high and low index materials used for the multilayer mirrors, the role of a spacer inserted in between the mirrors to obtain an extended cavity, and the effect of an absorbing electrode made of metallic or transparent conductive oxide layer. The results of our different optimizations have shown a quality factor (Q) as high as 15 000. (C) 2011 Optical Society of America <br> https://ir.lib.ncu.edu.tw/handle/987654321/49951 title: Optical heterodyne grating shearing interferometry for long-range positioning applications abstract: We develop a displacement measurement and positioning system with nanometer resolution over the millimeter traveling range The method is based on a heterodyne grating shearing interferometry a homemade lock-in amplifier and a servo control loop for displacement sensing and positioning The quasi-common optical path configuration of our system provides better immunity against environmental disturbances The experimental results demonstrate that our system can measure small and long displacement with nanometric resolution The device achieves a positioning resolution of 23 nm over a traveling range of 20 mm (C) 2010 Elsevier BV All rights reserved <br> https://ir.lib.ncu.edu.tw/handle/987654321/49949 title: Measurement of refractive index variation of liquids by surface plasmon resonance and wavelength-modulated heterodyne interferometry abstract: In this study an alternative method based on surface plasmon resonance is proposed for in-situ monitoring of variation in the refractive index of a test sample A wavelength modulated light source and an unequal-path length optical configuration heterodyne interferometer are used to detect the phase difference change which can then be used to estimate the change in the refractive index of a test sample The experimental results demonstrate a phase stability of 0 02 The resolution power of the refractive Index is 1 5 x 10(-6) RIU This method has several advantages over previously used methods such as simple optical setup easier operation in real time and low cost (C) 2010 Elsevier BV All rights reserved <br> https://ir.lib.ncu.edu.tw/handle/987654321/49947 title: INDUCED ABERRATIONS BY COMBINATIVE CONVEX/CONCAVE INTERFACES OF REFRACTIVE-INDEX-MISMATCH AND CAPABILITY OF ADAPTIVE OPTICS CORRECTION abstract: Adjustable fluidic adaptive lenses have been extensively studied because of the advantage of changing the geometric shape or refractive index without any mechanical moving parts. However, the induced aberrations were rarely discussed before. We address this issue by first clarifying the aberrations experimentally due to injected fluidic volumes. Experimental results show that under the injected fluidic volume of 0.1 ml, the main aberrations come front Z(1) (piston), Z(2) (tip), and Z(5) (defocus) and Zernike coefficients are 0.97, 0.31, and 1.31 mu m, respectively. In what follows, a series of tests specifically designed to explore the convex/concave interfaces and refractive-index-mismatch (RIM). Furthermore, we demonstrate the capability of adaptive optics (AO) correction on aberrations induced by combinative effects of multiple layers with convex/concave interfaces and RIM. A microelectromechanical system (MEMS) deformable mirror (DM) with 140 actuators was used in conjunction with Shack Hartmann wavefront sensor to realize the experimentation. In particular, we consider the aberration introduced by interfaces of RIM between water/oil and glass. After AO correction, we can improve wavefront with root mean square (RMS) of 2.17-0.17 mu m for an interface between water and glass. As for the interface between oil and glass, we are capable of improving RMS of 0.24-0.10 mu m. (C) 2011 Wiley Periodicals, Inc. Microwave Opt Technol Lett 53:2610-2615, 2011; View this article online at wileyonlinelibrary.com. DOI 10.1002/mop.26323 <br>