Browsing by Author "Chen, Jian-Hua"

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Automatic assembly of quartz tuning fork and microcantilever
(2012)
Cheng, Chiao-Hua
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Chen, Jian-Hua
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Shieh, Jen-Yu
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Hung, Shao-Kang
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機械工程學系
Conventional atomic force microscopes (AFMs) detect microcantilever deflection using an optical lever system. However, the complex mechanism of the optical lever system and the alignment of the laser spot on the microcantilever prevent such AFM systems from scanning large samples. AFM systems using a quartz tuning fork (QTF) as a force sensor have been proven feasible, and enhance compactness of the AFM system. This paper presents the automatic assembly of the QTF sensor and the microcantilever of commercial AFM probe using a visual servo method.
Design, fabrication, and characterization of Si-based ARROW photonic crystal bend waveguides and power splitters
(2012-08-20)
Chen, Jian-Hua
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Huang, Yang-Tung
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Yang, Yu-Lin
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Lu, Ming-Feng
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Shieh, Jia-Min
Silicon-based (Si-based) photonic crystal waveguide based on antiresonant reflecting optical waveguide (ARROW PCW) structures consisting of 60 degrees bends and Y-branch power splitters were designed and first efficiently fabricated and characterized. The ARROW structure has a relatively large core size suitable for efficient coupling with a single-mode fiber. Simple capsule-shaped topography defects at 60 degrees photonic crystal (PC) bend corners and Y-branch PC power splitters were used for increasing the broadband light transmission. In the preliminary measurements, the propagation losses of the ARROW PC straight waveguides lower than 2 dB/mm with a long length of 1500 mu m were achieved. The average bend loss of 60 degrees PC bend waveguides was lower than 3 dB/bend. For the Y-branch PC power splitters, the average power imbalance was lower than 0.6 dB. The results show that our fabricated Si-based ARROW PCWs with 60 degrees bends and Y-branch structures can provide good light transmission and power-splitting ability. (c) 2012 Optical Society of America
Design, Fabrication, and Characterization of Si-Based ARROW-B Photonic Crystal Sharp-Bend Waveguides and Power Splitters
(2012-07-15)
Chen, Jian-Hua
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Huang, Yang-Tung
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Yang, Yu-Lin
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Lu, Ming-Feng
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生物科技學系
Si-based type-B antiresonant reflecting optical waveguide (ARROW-B) photonic crystal waveguides (PCWs) with 60 degrees bend, 120 degrees bend, and Y-branch power splitter were first successfully fabricated and characterized. A simple capsule-shaped defect was designed to modulate the 60 degrees and 120 degrees photonic crystal (PC) bend corners and Y-branch PC power splitters. In the preliminary experiments, the average bend losses of 60 degrees and 120 degrees PC bend waveguides for both polarizations were lower than 1.5 and 4.2 dB/bend, respectively. For the Y-branch PC power splitters, power imbalances for both polarizations were all lower than 0.7 dB. It shows that the fabricated Si-based ARROW-B PCWs can provide good light sharp-bend ability and power-split ability.