Browsing by Author "Lin, Yi-Hsin"

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A biosensor of high-density lipoprotein of human serum on a liquid crystal and polymer composite film
(2013-01-01)
Lin, Yi-Hsin
;
Chang, Kai-Han
;
Chu, Wei-Lin
;
Tsou, Yu-Shih
;
Wu, Li-Ching
A biosensor for the concentration of high-density lipoprotein (HDL) in human serum on a liquid crystal and polymer composite film (LCPCF) is demonstrated. The sensing mechanism is based on a polar-polar interaction between orientation of LC directors and HDL in human serum. The concentration of polar HDL in human serum affects the orientations of LC directors at the interface between LCPCF and the human serum. In addition, the surface free energy of LCPCF changes with the applied voltage due to the electrically tunable orientations of LC directors anchored among the polymer grains of LCPCF. As a result, the droplet motion of human serum on LCPCF under applied voltages can sense the concentration of HDL in human serum.
A biosensor of high-density lipoprotein of human serum on a liquid crystal and polymer composite film
(2013-01-01)
Lin, Yi-Hsin
;
Chang, Kai-Han
;
Chu, Wei-Lin
;
Tsou, Yu-Shih
;
Wu, Li-Ching
A biosensor for the concentration of high-density lipoprotein (HDL) in human serum on a liquid crystal and polymer composite film (LCPCF) is demonstrated. The sensing mechanism is based on a polar-polar interaction between orientation of LC directors and HDL in human serum. The concentration of polar HDL in human serum affects the orientations of LC directors at the interface between LCPCF and the human serum. In addition, the surface free energy of LCPCF changes with the applied voltage due to the electrically tunable orientations of LC directors anchored among the polymer grains of LCPCF. As a result, the droplet motion of human serum on LCPCF under applied voltages can sense the concentration of HDL in human serum.
A bistable polarizer-free electro-optical switch using a droplet manipulation on a liquid crystal and polymer composite film
(2010-05-10)
Lin, Yi-Hsin
;
Li, Jiong-Kuan
;
Chu, Ting-Yu
;
Hsu, Hsu-Kuan
;
光電工程學系
A bistable, polarizer-free, and reflective electro-optical switch based on a droplet manipulation on a liquid crystal and polymer composite film (LCPCF) is demonstrated. A color droplet on LCPCF can be manipulated by a wettability gradient owning to the distribution of LC directors anchored among the polymer grains on LCPCF. The contrast ratio is around 8: 1 in a reflective mode. The potential applications of droplet manipulation are electronic papers and reflective displays. (C)2010 Optical Society of America
A concentrating photovoltaic system based on liquid crystal light modulation
(2013)
Tsou, Yu-Shih
;
Lin, Yi-Hsin
;
交大名義發表
;
光電工程學系
;
National Chiao Tung University
A concentrating photovoltaic (CPV) system with a steady electric output adopting an electrically tunable concentration ratio of the LC light modulation is demonstrated. The distribution of the LC directors of the LC light modulation can be controlled by an applied voltage in order to adjust the number of incident photons in an area. Therefore the system can be operated with an static and maximum output under different ambient illuminations because the LC light modulation helps to increase photocurrent at a low illumination and prevent the effect of the series resistance at a high illumination.
A concentration photovoltaic system adopting a liquid crystal light modulation
(2012)
Tsou, Yu-Shih
;
Lin, Yi-Hsin
;
Wei, An-Chi
;
光電工程學系
;
Department of Photonics
A concentration photovoltaic (CPV) system adopting a liquid crystal light modulation is demonstrated. The LC light modulation adjusts the optical power density of the incident light based on the electrically controllable distribution of LC directors. The electrically tunable concentration ratio of the LC light modulation can help to achieve the highest and a fixed efficiency of the CPV system because the LC light modulation helps to increase the photocurrent at a low illumination and prevent the effect of the series resistance at a high illumination. This study opens a window in solar cells by using LC light modulations.
A droplet manipulation on a liquid crystal and polymer composite film as a concentrator and a sun tracker for a concentrating photovoltaic system
(2013-06-28)
Tsou, Yu-Shih
;
Chang, Kai-Han
;
Lin, Yi-Hsin
;
光電工程學系
;
Department of Photonics
We demonstrate a droplet manipulation on a liquid crystal and polymer composite film (LCPCF) as a concentrator and a sun tracker for a concentrating photovoltaic (CPV) system with a steady output electric power. The CPV system adopts a liquid lens on LCPCF whose curvature is not only tunable but position is also bistably switchable based on liquid crystal orientations on LCPCF. The change of curvature of the liquid lens results in a tunable concentration ratio which helps to increase photocurrent at a low illumination and prevent the effect of the series resistance at a high illumination. Moreover, the change of the position of the liquid lens helps to track sun owing to sun movement. Therefore, the output power of such a system is steady no matter the sunlight condition and the angle of incident light. The operating principles and experiments are investigated. The concept in this paper can be extended to design optical components for obtaining steady output power of the solar cell at indoor or outdoor use and also tracking sunlight. (C) 2013 AIP Publishing LLC.
A fast response and large electrically tunable-focusing imaging system based on switching of two modes of a liquid crystal lens
(2010-08-09)
Lin, Hung-Chun
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Lin, Yi-Hsin
;
光電工程學系
;
Department of Photonics
We demonstrated a fast response and large tunable focusing imaging system consisting of a lens module and a liquid crystal (LC) lens based on the switching of two modes of a LC lens: the negative LC lens and positive LC lens. By discarding the conventional operation of a positive LC lens only in the imaging system, large tunable focusing range can be achieve from 300 to 10 cm owning to the phase change between the positive and the negative LC lens; meanwhile, the response time is fast (similar to 433 ms). The potential applications are autofocused cell phones, and cameras. (C) 2010 American Institute of Physics. [doi:10.1063/1.3479051]
A Holographic Projection System With an Electrically Adjustable Optical Zoom and a Fixed Location of Zeroth-Order Diffraction
(2014-06-01)
Chen, Ming-Syuan
;
Collings, Neil
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Lin, Hung-Chun
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Lin, Yi-Hsin
;
光電工程學系
An electrically tunable optical zooming holographic projection system with a fixed location of zeroth-order diffraction is demonstrated. By using two liquid lenses and an encoded Fresnel lens on a liquid crystal on silicon (LCoS) panel, the size of the projected image of the holographic projection system is changeable; meanwhile, the locations of both of the zeroth-order diffraction and the first-order diffraction are unchanged. Therefore, the zeroth-order diffraction can be removed by using a fixed optical high-pass filter. We can use it to realize an image size matching system for green light (532 nm) and red light (632.8 nm) without any positional motion of the optical elements. The optical zoom function enhances the feasibility to realize a high-resolution full-color holographic projection system.
A holographic projection system with an electrically tuning and continuously adjustable optical zoom
(2012-12-03)
Lin, Hung-Chun
;
Collings, Neil
;
Chen, Ming-Syuan
;
Lin, Yi-Hsin
;
光電工程學系
A holographic projection system with optical zoom is demonstrated. By using a combination of a LC lens and an encoded Fresnel lens on the LCoS panel, we can control zoom in a holographic projector. The magnification can be electrically adjusted by tuning the focal length of the combination of the two lenses. The zoom ratio of the holographic projection system can reach 3.7:1 with continuous zoom function. The optical zoom function can decrease the complexity of the holographic projection system. (c) 2012 Optical Society of America
A large bistable negative lens by integrating a polarization switch with a passively anisotropic focusing element
(2014-06-02)
Chen, Hung-Shan
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Lin, Yi-Hsin
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Srivastava, Abhishek Kumar
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Chigrinov, Vladimir Grigorievich
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Chang, Chia-Ming
A bistable negative lens with a large aperture size (similar to 10mm) by integrating a polarization switch of ferroelectric liquid crystals (FLCs) with a passively anisotropic focusing element is demonstrated. The proposed lens not only exhibits electrically tunable bistability but also fast response time of sub-milliseconds. The tunable lens power is from 0 to -1.74 Diopters. The electro-optical properties and imaging performances are demonstrated. The impact of this study is to provide a solution of electrically bistable liquid crystal lenses for the applications of portable devices, wearable devices and colored ophthalmic lenses. (C) 2014 Optical Society of America
A lesson in student chapters
(2015-01-01)
Lin, Yi-Hsin
;
光電工程學系
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Department of Photonics
A liquid crystal and polymer composite film for liquid crystal lenses
(2015-01-01)
Lin, Yi-Hsin
;
Chen, Hung-Shan
;
Wang, Yu-Jen
;
Chang, Chia-Ming
;
光電工程學系
Liquid crystal (LC) lenses offer novel opportunities for applications of ophthalmic lenses, camera modules, pico projectors, endoscopes, and optical zoom systems owing to electrically tunable lens power. Nevertheless, the tunable lens power and the aperture size of LC lenses are limited by the optical phase resulting from limit birefringence of LC materials. Recently, we developed a liquid crystal and polymer composite film (LCPCF) as a separation layer and an alignment layer for a multi-layered structure of LC lenses in order to enlarge the polarization-independent optical phase modulation. However, the physical properties and mechanical properties of the LCPCF are not clearly investigated. In this paper, we show the mechanical and physical properties of the LCPCF. The anchoring energy of the LCPCF is comparable with the standard rubbing-induced alignment layer. The transmission efficiency is around 97% neglecting the Fresnel reflection. The surface roughness is under 2 nm by using AFM scanning. The bending strength test indicates that the LCPCF can hold the LC material with reasonable deformation. We believe this study provides a deeper insight to the LC lens structure embedded with LCPCF.
A Pico Projection System With Electrically Tunable Optical Zoom Ratio Adopting Two Liquid Crystal Lenses
(2012-07-01)
Lin, Yi-Hsin
;
Chen, Ming-Syuan
;
光電工程學系
;
Department of Photonics
A pico projection system with electrically tunable optical zoom ratio adopting two liquid crystal (LC) lenses is first demonstrated. The projected image of the system is not only continuously focused, but also zoomed simultaneously by adjusting the focal lengths of LC lenses electrically. The related optical principle is discussed and a liquid-crystal-on-silicon (LCOS)-based pico projection system was used to demonstrate the designed concept. This study opens a new window in realizing pico projectors with electrically tunable optical zooms.
A polarization independent liquid crystal microlens arrays adopting surface pinning effect of polymer dispersed liquid crystals
(2011)
Tsou, Yu-Shih
;
Lin, Yi-Hsin
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光電工程學系
;
Department of Photonics
A tunable polarization-independent LC microlens arrays using surface pinning effect of polymer dispersed liquid crystals (SP-PDLC) is demonstrated. The mechanism includes residual phase modulation in bulk region and double-layered phase modulations near glass substrates.
A polarization independent liquid crystal phase modulation adopting surface pinning effect of polymer dispersed liquid crystals
(2011-12-01)
Lin, Yi-Hsin
;
Tsou, Yu-Shih
;
光電工程學系
;
Department of Photonics
A polarization-independent liquid crystal (LC) phase modulation using the surface pinning effect of polymer dispersed liquid crystals (SP-PDLC) is demonstrated. In the bulk region of the SP-PDLC, the orientations of LC directors are randomly dispersed; thus, any polarization of incident light experiences the same averaged refractive index. In the regions near glass substrates, the LC droplets are pinned. The orientations of top and bottom droplets are orthogonal. Two eigen-polarizations of an incident light experience the same phase shift. As a result, the SP-PDLC is polarization independent. Polarizer-free microlens arrays of SP-PDLC are also demonstrated. The SP-PDLC has potential for application in spatial light modulators, laser beam steering, and electrically tunable microprisms. (C) 2011 American Institute of Physics. [doi:10.1063/1.3666053]
A polarization-independent liquid crystal phase modulation using polymer-network liquid crystal with orthogonal alignment layers
(2012-01-01)
Chen, Ming-Syuan
;
Lin, Wei-Chih
;
Tsou, Yu-Shih
;
Lin, Yi-Hsin
;
光電工程學系
A polarization-independent liquid crystal (LC) phase modulation using polymer-network liquid crystals with orthogonal alignments layers (T-PNLC) is demonstrated. T-PNLC consists of three layers. LC directors in the two layers near glass substrates are orthogonal to each other. In the middle layer, LC directors are perpendicular to the glass substrate. The advantages of such T-PNLC include polarizer-free, larger phase shift (similar to 0.4 pi rad) than the residual phase type (< 0.05 pi rad), and low operating voltage (< 30V(rms)). It does not require bias voltage for avoiding scattering because the refractive index of liquid crystals matches that of polymers. The phase shift of T-PNLC is affected by the cell gap and the curing voltages. The potential applications are laser beam steering, spatial light modulators and electrically tunable micro-lens arrays.
A polarization-independent liquid crystal phase modulation using polymer-network liquid crystal with orthogonal alignment layers
(2012-01-01)
Chen, Ming-Syuan
;
Lin, Wei-Chih
;
Tsou, Yu-Shih
;
Lin, Yi-Hsin
;
光電工程學系
A polarization-independent liquid crystal (LC) phase modulation using polymer-network liquid crystals with orthogonal alignments layers (T-PNLC) is demonstrated. T-PNLC consists of three layers. LC directors in the two layers near glass substrates are orthogonal to each other. In the middle layer, LC directors are perpendicular to the glass substrate. The advantages of such T-PNLC include polarizer-free, larger phase shift (similar to 0.4 pi rad) than the residual phase type (< 0.05 pi rad), and low operating voltage (< 30V(rms)). It does not require bias voltage for avoiding scattering because the refractive index of liquid crystals matches that of polymers. The phase shift of T-PNLC is affected by the cell gap and the curing voltages. The potential applications are laser beam steering, spatial light modulators and electrically tunable micro-lens arrays.
A polarization-independent liquid crystal phase modulation using polymer-network liquid crystals in a 90 degrees twisted cell
(2012-07-15)
Lin, Yi-Hsin
;
Chen, Ming-Syuan
;
Lin, Wei-Chih
;
Tsou, Yu-Shih
;
光電工程學系
A polarization-independent liquid crystal phase modulation using polymer-network liquid crystals in a 90 degrees twisted cell (T-PNLC) is demonstrated. T-PNLC consists of three layers. Liquid crystal (LC) directors in the two layers near glass substrates are orthogonal to each other and those two layers modulate two eigen-polarizations of an incident light. As a result, two eigen-polarizations of an incident light experience the same phase shift. In the middle layer, LC directors are perpendicular to the glass substrate and contribute no phase shift. The phase shift of T-PNLC is electrically tunable and polarization-independent. T-PNLC does not require any bias voltage for operation. The phase shift is 0.28 pi rad for the voltage of 30 V-rms. By measuring and analyzing the optical phase shift of T-PNLC at the oblique incidence of transverse magnetic wave, the pretilt angle of LC directors and the effective thickness of three layers are obtained and discussed. The potential applications are spatial light modulators, laser beam steering, and micro-lens arrays. (C) 2012 American Institute of Physics. [http://dx.doi.org/10.1063/1.4737260]
A polarized bifocal switch based on liquid crystals operated electrically and optically
(2015-01-28)
Chen, Hung-Shan
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Lin, Yi-Hsin
;
Chang, Chia-Ming
;
Wang, Yu-Jen
;
Srivastava, Abhishek Kumar
A polarized bifocal switch based on liquid crystals (LC) operated electrically and optically is demonstrated. The bifocal switch mainly consists of two parts: a LC layer as a polarization switch and two polymeric layers for modulation of polarization dependent spatial phase difference which results in a positive or a negative lensing effect. The orientations of the LC molecules in the polarization switch are manipulated either in electrically switching (ES) mode or optically rewritten (ORW) mode. The bifocal switch with an aperture size of 10mm exhibits two discrete lens powers (-1.39 Diopter and +0.7 Diopter) with different polarization states no matter in ES mode or in ORW mode. ORW mode is also a bistable mode. The related mechanism and electro-optical performance are discussed and demonstrated. Such a versatile optical switch is capable of not only switching between a positive lens power and a negative lens power, but also switching between two linear polarization states which can be useful in optical systems. The potential applications are for optical systems, wearable devices and ophthalmic lenses. (C) 2015 AIP Publishing LLC.
A polarized liquid crystal lens with electrically switching mode and optically written mode
(2015-01-01)
Chen, Hung-Shan
;
Lin, Yi-Hsin
;
Chang, Chia-Ming
;
Wang, Yu-Jen
;
Srivastava, Abhishek Kumar
A polarized liquid crystal (LC) lens composed of a LC layers as a polarization switch and a liquid crystal and polymer composites lens (LCPC lens) is demonstrated with electrically switching (ES) mode and optically rewritten (ORW) mode. The lens power of LCPC lens is related to a polarization state of light modulated by the LC layer whose orientations are manipulated either electrically or optically. As a result, the LC lens is not only electrically switchable, but also optically rewritable. Each mode, ES mode or ORW mode, exhibits two discrete lens powers (-1.39 Diopter and +0.7 Diopter). The demonstrated aperture size is 10 mm. The detail optical mechanism is also discussed. The Modulation Transfer Function (so-called MTF) of the lens is measured as well. In addition, the image performance and the dispersion of the LC lens are investigated. Such a polarized LC lens could be a special switch in optical systems due to dual operation modes.