Browsing by Author "Tsai, Che-Liang"

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A time-delay calibrated method for cornea hysteresis and intraocular pressure measurement
(2016-04-01)
Wang, Kuo-Jen
;
Tsai, Che-Liang
;
Wang, Wai
;
Hsu, Long
;
Hsu, Ken-Yuh
The presence of cornea hysteresis (CH) in characterizing the intraocular pressure (IOP) of a human eye deteriorates the accuracy of IOP. To suppress CH, the pressure gauge of a tonometer must be located as close as possible to the cornea. However, this arrangement is unpractical because appropriate working distance to the cornea is required. In this paper, a time-delay calibrated (TDC) method is proposed to counteract the undesired effect of CH in characterizing the IOP. Employing this TDC method, the CH approaches to zero for most eyes measured.
A time-delay calibrated method for cornea hysteresis and intraocular pressure measurement
(2016-04)
Wang, Kuo-Jen
;
Tsai, Che-Liang
;
Wang, Wai
;
Hsu, Long
;
Hsu, Ken-Yuh
The presence of cornea hysteresis (CH) in characterizing the intraocular pressure (IOP) of a human eye deteriorates the accuracy of IOP. To suppress CH, the pressure gauge of a tonometer must be located as close as possible to the cornea. However, this arrangement is unpractical because appropriate working distance to the cornea is required. In this paper, a time-delay calibrated (TDC) method is proposed to counteract the undesired effect of CH in characterizing the IOP. Employing this TDC method, the CH approaches to zero for most eyes measured.
An easier way to improvement the trapping performance of optical tweezers by donut-shaped beam
(2010)
Tsai, Che-Liang
;
Huang, Hang-Ping
;
Hsu, Long
;
Hsu, Ken-Yuh
;
光電工程學系
In optical tweezers, it can be comprehended that the larger the inclination angle between the condensed laser beam and the optical axis contributes more to axial trapping force, while the central part of laser beam with smaller inclination angle contributes more transverse trapping force. Therefore donut-shaped beam is used to improve the problem of less-axial trapping for common optical tweezers. Some research reports have shown that the efficiency of a trapping force can be enhanced by using a donut-shaped beam. In this paper we present the dependence of the axial and the transverse components of a trapping force on the configuration of a focused donut-shaped beam. The simulation result will provide a simple and easy guide for optical tweezers users to adjust the configuration of a focused donut-shaped beam for optimal trapping performance.
Atomic Layer-Deposited Al-Doped ZnO Thin Films for Display Applications
(2020-06-01)
Dimitrov, Dimitre
;
Tsai, Che-Liang
;
Petrov, Stefan
;
Marinova, Vera
;
Petrova, Dimitrina
The integration of high uniformity, conformal and compact transparent conductive layers into next generation indium tin oxide (ITO)-free optoelectronics, including wearable and bendable structures, is a huge challenge. In this study, we demonstrate the transparent and conductive functionality of aluminum-doped zinc oxide (AZO) thin films deposited on glass as well as on polyethylene terephthalate (PET) flexible substrates by using an atomic layer deposition (ALD) technique. AZO thin films possess high optical transmittance at visible and near-infrared spectral range and electrical properties competitive to commercial ITO layers. AZO layers deposited on flexible PET substrates demonstrate stable sheet resistance over 1000 bending cycles. Based on the performed optical and electrical characterizations, several applications of ALD AZO as transparent conductive layers are shown-AZO/glass-supported liquid crystal (LC) display and AZO/PET-based flexible polymer-dispersed liquid crystal (PDLC) devices.
Light-driven manipulation of picobubbles on a titanium oxide phthalocyanine-based optoelectronic chip
(2011-04-11)
Yang, Shih-Mo
;
Yu, Tung-Ming
;
Huang, Hang-Ping
;
Ku, Meng-Yen
;
Tseng, Sheng-Yang
Microbubbles have a variety of applications in science and biological technology. Here, we demonstrate the manipulation of the picoliter gas bubble (picobubble) based on the optoelectronic-mechanism. The organic photoconductive material, titanium oxide phthalocyanine (TiOPc), was developed to make the light-sensitive substrate of this optoelectronic chip. The virtual electrodes are formed by projecting the dynamic light pattern onto TiOPc layer for generating the desired nonuniform electric field. The picobubble suspended in silicone oil can be manipulated with the velocity of 40-50 mu m/s. The driving force up to 160 pico-Newtons could be generated for manipulating a gas bubble of 300 picoliters. (C) 2011 American Institute of Physics. [doi:10.1063/1.3580760]
Tunable Single-Pair Hollow-Beam-Converter Dark-Field Microscopy
(2013-10-01)
Tsai, Che-Liang
;
Hsu, Long
;
Huang, Kuang-Lung
;
Hsu, Ken-Yuh
;
電子物理學系
A tunable single-pair hollow-beam-converter (TSHBC) dark-field microscopy is proposed and fabricated. The TSHBC is composed of one pair of parallel reflective mirrors of complementary cone shape. By simply adjusting the longitudinal separation between the two mirrors of TSHBC, a dark-field image with more high contrast and high energy efficiency can be obtained for a given objective lens. Furthermore, the selection criteria of the condenser lens and objective lens are provided for the structure of an optimal dark-field microscopy with TSHBC. (C) 2013 The Japan Society of Applied Physics