Browsing by Author "Li, Wang-Yang"

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A Reflective Polarizer-free Display Using a Droplet Manipulation on a Liquid Crystal and Polymer Composite Film
(2009)
Lin, Yi-Hsin
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Lin, Hung-Chun
;
Li, Jiong-Kuan
;
Hsu, Hsu-Kuan
;
Li, Wang-Yang
A polarizer-free display using a droplet manipulation on a liquid crystal and polymer composite film (LCPCF) is demonstrated. Because of the electrically tunable orientation of the liquid crystal directors anchored among the polymer grains, the wettability of the LCPCF changes with an applied in-planed electric field. As a result, we can realize a reflective polarizer-free display when the colored droplet on the top of the LCPCF is manipulated by an inhomogeneous electric field. The contrast ratio is around 9:1 and the response time is around 900 ms.
Non-invasive biopsy of doped-ions inside optical substrate by modified two-photon microscopy
(2015-01-26)
Wang, Yao-Chin
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Chen, Hsiang-Ning
;
Li, Wang-Yang
;
Chan, Ming-Che
;
光電系統研究所
Doped-ion based optical elements play key roles in optical signal processes, including amplification, absorption, wavelength-filtering, lighting, and polarizing plate. Non-invasively mapping the spatial distribution of the ion concentrations in these optical elements is highly desirable either during the fabrication process or to determine their optical qualities. In this work, we applied modified two-photon fluorescence (mTPF) microscopy to trace the ion-distributions deep inside the optical elements. For demonstration purposes, polyvinyl alcohol (PVA) polymer films inside polarizing plates are taken as an example, where the spatial distributions of Iodine-dyed ions were measured by the m-TPF microscope in a fast and non-invasive way. The durability of the polarizer films can be distinguished from the axial distribution of the Iodine-dyed ions, without the need to perform a biopsy. This proposed method and demonstrated results show great potential for monitoring the spatial distributions of doped-ions in the optical elements quickly and non-destructively, which would be of great benefit in both scientific research and industrial applications. (C) 2015 Optical Society of America
Polarizer-free and fast response microlens arrays using polymer-stabilized blue phase liquid crystals
(2010-03-15)
Lin, Yi-Hsin
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Chen, Hung-Shan
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Lin, Hung-Chun
;
Tsou, Yu-Shih
;
Hsu, Hsu-Kuan
We demonstrate polarizer-free and fast response microlens arrays based on optical phase modulation of polymer-stabilized blue phase liquid crystal (PSBP-LC). Polarization-independent optical phase shift is because the propagation of an incident light is along the optic axis of PSBP-LC, and birefringence of PSBP-LC induced by Kerr effect results in electrically tunable optical phase shift. The measured optical phase shift of a PSBP-LC phase modulation is around pi radian at 150 V(rms) for the cell gap of 7 mu. The response time is about 3 ms. The focal length is around 13.1 cm at 100 V(rms).
The Dynamics of Human Sperm Droplets on a Liquid Crystal and Polymer Composite Film
(2010-01-01)
Lu, Farn
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Lin, Yi-Hsin
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Tsai, Wan-Chen
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Li, Jiong-Juan
;
Chu, Ting-Yu
A switchable surface using a liquid crystal and polymer composite film (LCPCF) based on phase separation between liquid crystals (LC) and polymers after photopolymerization is developed recently. The wettability of LCPCF is electrically tunable because of the orientation of liquid crystal directors anchored among the polymer grains under an in-planed electric field. A water droplet on the top of LCPCF can be manipulated under an inhomogeneous electric field on the LCPCF owning to the wettability gradient. The dynamics of a droplet of human sperms on the LCPCF is demonstrated as well. Three motions of sperm droplets are observed: the droplet collapse and the droplet stretch,. We found that the dynamics, concentrations, and activities of spermatozoa, affect the motions of a sperm droplet. The potential applications of LCPCF are polarizer-free displays, liquid lenses, and the microfluidic device in assisted reproductive technology (ART)