Photonics Technology and Its Applications

Design and Fabrication of Critical Components in Adaptive Optics [ 下載 PDF ]

Yen-Liang Liu, Vinna Lin, Guo-Dung John Su

Adaptive optics is a technology that improves the performance of optical systems by reducing wavefront distortion. Currently, it is playing a more important role in astronomy, laser physics, nonlinear optics, medicine, vision and the defense industry. This paper demonstrates how we design and fabricate critical components, microlens array (MLA) and large-stroke MEMS (microelectromechanical system) deformable mirror, in adaptive optics and their applications. We present MLA with long focal length (millimeter range, which is usually several hundred microns) in various structures and arrangements. We use fi nished MLA on Shack-Hartmann wavefront sensors to evaluated the performance. On the other hand, we demonstrate a large-stroke MEMS deformable mirror with a 20 mm diameter circular opening and 67 hexagonal actuation electrodes. The polymer deformable mirror is a strong candidate for active wavefront control, based on our experimental results.

CIGS Technologies & Challenges in Taiwan [ 下載 PDF ]

Hua-Kai Lin, Chung-Wen Lan

According to the global warming, renewable energy gets great attention in recent years, especially solar energy. But it still has a long way to go with the cost of silicon based solar cell to be lower than $1/Wp. To reach the target of grid parity, thin-fi lm solar cell which has small amount of material has been given high expectations. Copper indium gallium selenide (CIGS) compound solar cell is almost recognized the opportunity to go beyond silicon because its effi ciency is higher than 20%. In this article, the challenges and technology of CIGS thin fi lm solar cell are briefl y introduced.

SNR Improvement of Ultrafast Laser Based Time- Resolved Pump-Probe System [ 下載 PDF ]

Chun-Jen Weng, Tai-Shen Wang, Shian-Wen Chang, Shyh-Shii Pai

SNR is an important indicator for time-resolved pump-probe system. We focus on improvement of SNR in this study. After optimization, the SNR of time-resolved pump-probe system for GaAs sample is about 50 in this system. The optical power for pump and probe beam is only 50 mW and 1 mW, respectively.

The Fiber Bragg Grating Signal Interrogation System and Its Applications [ 下載 PDF ]

Ming-Chang Shih

We demonstrate a fi ber sensing system based on a fi ber ring resonator in which the Q-factor of the resonator cane be modulated by the perturbation of the fi ber Bragg grating. It is able to measure real time strain and stress directly by the variation of the intensity of the output or the fi ber ring laser due to the modulation of the FBG, and can achieve frequency response as high as 3 kHz.

High Performance of Back Contact Solar Module Technology [ 下載 PDF ]

Hsin-Hsin Hsieh, Fu-Ming Lin, Wen-Haw Lu

According to the annual reports and analyses from European Photovoltaic Industry Association (EPIA), crystalline solar (c-Si) cell module technology should be the main stream on the photovoltaic market share by 2030 since the c-Si has a high reliability nature. However, in order to fulfi ll the requirements on low-cost and high performance, back contact solar cell module technology was carried out to increase the light-exposure area on the cell surface and reduce the power loss/series resistance at module end. Compare to the conventional H-grid solar module process, the high temperature soldering was replaced by electrical conductive adhesive for interconnecting process. Thus, the wafer bowing rate can be reduced and a fast lamination step can be achieved.

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Passive Sampler and Its Applications in Environmental Analysis [ 下載 PDF ]

Yong-Chien Ling, Bo-Chia Chen, Fu-Xiang Sung, Cheng-Yu Wang, Ming-Shiuan Yeh

Passive sampling devices are free of external power and human intervention requirements. They are suitable for long-time consecutive, large-area, and remote-area sampling of environmental samples. This paper introduces four passive sampling devices including semipermeable membrane device (SPMD), polar organic chemical integrative sampler (POCIS), polyurethane foam disk (PUF disk) sampler, and diffusion gradients in thin-fi lm (DGT) sampler.

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New Sample Preparation Method—QuEChERS [ 下載 PDF ]

Ren-Jye Lee, Pei-Cheng Wang, Maw-Rong Lee

QuEChERS, an acronym for Quick, Easy, Cheap, Effective, Rugged and Safe, is a new sample preparation method proposed in recent year. It can be used for solid and liquid samples analyses. After liquid extraction with acetonitrile, some of the extract was further purifi ed by anhydrous MgSO₄ and primary secondary amine (PSA) sorbents. The cleanup solution was analyzed via proper instrument. This method was fi rst applied in the analysis of multi-residue pesticides. It is also applied to extract trace analytes in environmental, food, and biological matrices. This paper will introduce the extraction procedure. The applications in the environmental analysis, food safety and biological analysis are also reviewed.

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Surface Science Approach to the Mechanistic Studies of Heterogeneous Catalysis [ 下載 PDF ]

Shin-Mou Wu, Chao-Ming Chiang

Mechanistic studies of heterogeneous catalysis using surface analytical techniques have solved many fundamental problems concerning active species and active sites on the catalysts. The surface science approach has brought many revolutionary ideas to the chemical industry. Here the working principles of two commonly adopted surface techniques, namely temperature programmed desorption (TPD) and reflection absorption infrared spectroscopy (RAIRS) are introduced, and the methods to extract the information about reaction kinetics, identities, and adsorption geometry of the surface intermediates are delineated.

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"The Determination of Trace Elements of Hg, As in Coal by Atomic Absorption Spectrometry and Atomic Fluorescence Spectrometry" [ 下載 PDF ]

Han Wen Cheng, Ching Tsung Yu

Trace elements (ppm–ppb) of mercury (Hg) and arsenic (As) in flue gas from coal-fired process should be accurately determination in view of environmental impact in the future. This study was aimed to develop the analytical technique for trace elements by using several certifi ed materials from NIST, ERA. Mercury and arsenic in aqueous solution by cold vapor atomic absorption spectrometry (CVAAS) was obtained less than 5% of relative standard deviation (RSD) located at 4.7–1557 ppb for Hg analysis and was less than 10% of RSD at 10–352 ppb for As analysis, respectively. The RSD was future improved to less than 3% for 10–352 ppb As by using atomic fluorescence spectrometry (AFS). Besides, the recovery of trace elements of mercury and arsenic in real coal samples via microwave digestion was between 86 to 97%.