Quantitative characterization and imaging of three-dimensional (3D) microstructures using optical methods are of great concerns in both scientific research and practical applications, such as life science and micro sy...
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ISBN:
(纸本)9781467304511
Quantitative characterization and imaging of three-dimensional (3D) microstructures using optical methods are of great concerns in both scientific research and practical applications, such as life science and micro systems technology (MST). A number of optical principles have been applied for different types of 3D microscopy. Laser scanning confocal microscope (LASCM), interferometric microscope (IM), Zernike phase contrast (ZPC), differential interference contrast (DIC), optical coherence tomography (OCT) and digital holographic microscope (DHM) are typical representatives for 3D micro imaging. Most of mentioned technique for 3D microscopy have been already commercialized and are currently available on the market. However, not all of those optical imaging methods are suitable for quantitative assessment of microstructures but only for qualitative observations with a few exceptions like DHM and IM. Quantitative analysis and characterization of 3D microstructures have become increasingly important as the development of microsystems, including micro-optics, micro fluidics and lab-on-chips. Structured illumination based range imaging on (SIRI) such as fringe projection profilometry has been widely used in industry and scientific research. Typical examples of range imaging in a variety of application fields include art, architecture, archeology, medical imaging, industrial inspection, reverse engineering, virtual reality, to name just a few. The SIRI works well in a moderate scale in terms of target size. In contrast with the SIRI in macro scale, the research of micro range imaging based on structured illumination (μSIRI) receives much less attention. However, the μSIRI could be a promising candidate for quantitative three-dimensional (3D) imaging in microscopy due to its unique features such as fast acquisition, high data density, and cost-effective configuration. This talk will address some important issues regarding the μSIRI as an enabling tool for quantitative 3D i
Uncooled infrared detectors are applied widely in both civilian and military. Recently, novel microbolometers composing of two planes located at different levels were proposed to improve the performance of the detecto...
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ISBN:
(纸本)9781424494408
Uncooled infrared detectors are applied widely in both civilian and military. Recently, novel microbolometers composing of two planes located at different levels were proposed to improve the performance of the detectors. In this paper, such two-layer microbolometers were simulated by finite element analysis. Results reveal that when SiO 2 film is utilized as the isolating and supporting material located at the lower bridge plane, the temperature rise of the pixel reaches 3~5 times higher than those in the conventional one-layer microbolometers, and the maximum IR absorptance increases for about 40%. Therefore, these two-layer microbolometers are helpful for significantly improving the thermal and optical properties. However, their structural stability turns poor. Consequently, the mechanical properties for such two-layer microbolometers should be enhanced in practical applications.
All-optical first-order temporal differentiator using a mechanically-induced long-period fiber grating (MI-LPFG) in a small diameter fiber is demonstrated. The coupling intensity of the grating can be enhanced by chan...
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All-optical first-order temporal differentiator using a mechanically-induced long-period fiber grating (MI-LPFG) in a small diameter fiber is demonstrated. The coupling intensity of the grating can be enhanced by changing the pressure applied on the fiber. The experimental results show that the transfer function of the MI-LPFG in a small diameter fiber is a high precision first-order temporal differentiator.
A novel method for measuring the modulation efficiency of electrooptic phase modulators is proposed based on the fiber-dispersion-induced signal fading. The fiber dispersion spectrally alters the relative phasing of t...
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A novel method for measuring the modulation efficiency of electrooptic phase modulators is proposed based on the fiber-dispersion-induced signal fading. The fiber dispersion spectrally alters the relative phasing of the phase modulated signal and leads to the fading of the recovered electrical signal, from which the modulation efficiency is obtained in the case of a given fiber dispersion. The frequency-dependent modulation index and half-wave voltage are experimentally measured for a commercial phase modulator, which agree well with the results obtained using the conventional technique.
Phosphorescent white organic light-emitting diodes (PhWOLEDs) based on blue (Firpic) and yellow [(t-bt)2Ir(acac)] phosphorescent emitters with various doping concentration were reported. A PhWOLED with high performanc...
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Phosphorescent white organic light-emitting diodes (PhWOLEDs) based on blue (Firpic) and yellow [(t-bt)2Ir(acac)] phosphorescent emitters with various doping concentration were reported. A PhWOLED with high performance characteristics has been obtained when the doping concentration for Firpic and (t-bt) 2Ir (acac) is 8 wt% and at 6 wt%, respectively. The Commission Internationale del’Eclairage (CIE) coordinates of the optimal PhWOLED is (0.333, 0.416) at 10 V. The high performance of the optimized PhWOLED is attributed to effective host-guest energy transfer and efficient exciton recombination combining with suppressed exciton-quenching process in the emitting layers.
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