Browsing by Author "Tsai, Hsiu-Ming"

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Deassociate the initial temporal phase deviation provided by photoelastic modulator for stroboscopic illumination polarization modulated ellipsometry
(2011-03-01)
Tsai, Hsiu-Ming
;
Chen, Chih-Wei
;
Tsai, Tsung-Han
;
Chao, Yu-Faye
;
光電工程學系
In addition to operating the imaging ellipsometric measurements by four-specific temporal phases in the photoelastic modulated ellipsometry, we added the fifth one to solve the initial phase of the photoelastic modulator. This methodology has been developed to conquer the slow imaging processing of charge-coupled device camera for the stroboscopic illumination in the polarization modulated imaging ellipsometry. Without any calibration in its initial phase, we can perform the ellipsometric measurement by the measurements of intensity at five-specific temporal phases. The intensities of a full cycle for a point on SiO(2)/Si thin film were measured and analyzed for verifying this algorithm. The five stroboscopic illuminations were performed to measure the two-dimensional distribution of the same SiO(2)/Si thin film. (C) 2011 American Institute of Physics. [doi: 10.1063/1.3568745]
Optimization of a four-temporal phase lock for photoelastic-modulated polarimetry
(2009-08-01)
Tsai, Hsiu-Ming
;
Chao, Yu-Faye
;
光電工程學系
;
Department of Photonics
A set of four-temporal phases in photoelastic-modulated polarimetry is proposed to measure the Stokes parameters. In comparison with the conventional polarimetry, which uses a set of four-spatial angles by rotating a quarter-wave plate to obtain the polarimetric parameters, this temporal type polarimetry not only can reduce the time consumption but also can avoid the measurement error from the beam deviation. In addition, based on singular value decomposition, the figure of merit of this temporal phase technique can improve its signal-to-noise ratio by a factor of 2 in comparison with the rotating quarter-wave plate. (C) 2009 Optical Society of America
Ultra fast self-corrected polarization modulated ellipsometer
(2011-02-28)
Tsai, Hsiu-Ming
;
Chen, Leng-Chun
;
Chao, Yu-Faye
;
光電工程學系
;
Department of Photonics
A high speed self-corrected algorithm is proposed for the polarization modulated ellipsometry (PME). In this post-flight analysis, we prove that a set of optimized ellipsometric parameters (EPs) can be obtained by using the intensities at 4 specific temporal phases. The correction ability to its initial phase by this technique has been demonstrated through a twisted nematic liquid crystals (TN-LC) cell under the driving of a square wave. Furthermore, the optimal modulation amplitude in obtaining the accurate and precise set of EPs will be discussed in this work. (C) 2011 Elsevier B.V. All rights reserved.