TOMORROW! SID Student Chapter Seminar: "High-performance and fast-switching liquid crystal devices based on polymer-stabilized cholesteric blue phase III and uniform lying helix" Prof. Liang-Chy Chien 3.18.16/2:00-3:00pm/ CREOL RM A214

SID Student Chapter Seminar: "High-performance and fast-switching liquid crystal devices based on polymer-stabilized cholesteric blue phase III and uniform lying helix" Prof. Liang-Chy Chien

Friday, March 18, 2016 2:00 PM to 3:00 PM
CREOL Room A214 ***Please note the location of this talk****

Prof. Liang-Chy Chien
Liquid Crystal Institute and Chemical Physics Interdisciplinary Program

Kent State University, Kent, Ohio 44242

Abstract:

As ultrahigh resolution UHD-TV becomes mainstream products, the demand on high dynamic range (HDR), which preserves details in the darkest and brightest areas of a picture, is high. HDTVs also suffer from motion blur. Liquid crystal displays (LCDs) in particular, tended to display distinct blurriness during very fast movements because of ghosting or the image left behind after switching. Current LCD technologies have not solved these issues completely.  Our expertise in flexoelectro-optical and blue phase devices has led to a level of innovative new approaches for flat-panel and wearable devices that could in some ways redefine how we access the HDR and video-rate response time. These and other topics will be reviewed, providing insights at both the applied and theoretical device levels.

The Novel Materials, Devices and Applications Lab at the Liquid Crystal Institute of Kent State University has continued to create high-performance and high-contrast electro-optical devices that provide leaps in capability for HDR and video-rate image response time. Most recently, we have developed a promising wide-temperature amorphous blue phase material (blue phase III) with novel physical behavior which is based on combining unique achromatic optical dark state and sub-millisecond switching behavior with hysteresis-free in voltage ramping.  The polymer-stabilized blue phase III (PSBP III) enables a wide temperature range and affords achromatic bright state and excellent dark state.  Our device now provides the first-ever approach to resolve LCDs issues of HDR and video-rate image.

The lecture will conclude with a discussion on a hot issue in LC technologies such as an in-plane-switching liquid crystal device based on uniform lying helix (ULH) alignment on polymerized surface is presented.  The surface alignment is formed by polymerizing a minute amount of a reactive monomer in a liquid crystal host to form nano-sized polymer fibers on the two substrates of the cell.  The short-pitch cholesteric comprises of a dual-frequency nematic liquid crystal, a twist-bend nematic liquid crystal and a chiral dopant.  Substantial improvements in electro-optical properties such as large field-induced tilt angle (> 45^o) and fast response time (~100 ms) have been achieved.  We will also present the analytical analyses of flexoelectric behavior and morphological properties of the polymer stabilized ULH.

Biography:

L.-C. Chien received his Ph.D. in Polymer Chemistry from the University of Southern Mississippi and joined Liquid Crystal Institute of Kent State in 1988.  His research interests include the studies of advanced functional materials, structures and surfaces as well as the innovative applications of such materials in displays electro-optical and photonic devices. He has published 150 articles, over 150 scientific proceedings and digest papers, edited 15 conference proceedings, three books and seven book chapters as well as 25 issued patents. He is a co-inventor of the bistable reflective cholesteric displays, polymer-stabilized liquid crystal display devices and technologies. Dr. Chien has been active in providing his services to professional society such as organizing and chair conferences as well as serve as an advisor or program committee on many international conferences.

His research in polymer and liquid crystal composites focuses on control of dimension, location and spatial distribution of phase separated polymers at the micro- and nano-scale on substrate surfaces or in the bulk.  His research in polymer dispersed, modified and stabilized liquid crystal materials have led to the development of advanced electro-optical, photonic and display devices such as reflective bistable displays, electrically switchable color filters, electrically-switchable gratings, and blue phases based devices.  The recently developed polymer dispersed and stabilized blue phases enable the fabrication of fast-switching spatial light modulators. 

His research in tailoring liquid crystal materials to provide control over structure, surface, morphology, and processing have led to the development of new electro-optical devices. For examples, research in active and stimuli-responsive low- and high-molar-mass materials have led to the development of artificial muscles, light emitting devices and organic thin film transistors; Furthermore, the active materials whose functionality are used for controlled- assembly or self-assembly of dispersed nanoparticles to ordered structures to enhance desired properties of functional devices.

For additional information:

Haiwei Chen

SID Student Chapter Seminar: "High-performance and fast-switching liquid crystal devices based on polymer-stabilized cholesteric blue phase III and uniform lying helix" Prof. Liang-Chy Chien 3.18.16/2:00-3:00pm/ CREOL RM A214

SID Student Chapter Seminar: "High-performance and fast-switching liquid crystal devices based on polymer-stabilized cholesteric blue phase III and uniform lying helix" Prof. Liang-Chy Chien

Friday, March 18, 2016 2:00 PM to 3:00 PM
CREOL Room A214

Prof. Liang-Chy Chien
Liquid Crystal Institute and Chemical Physics Interdisciplinary Program

Kent State University, Kent, Ohio 44242

Abstract:

As ultrahigh resolution UHD-TV becomes mainstream products, the demand on high dynamic range (HDR), which preserves details in the darkest and brightest areas of a picture, is high. HDTVs also suffer from motion blur. Liquid crystal displays (LCDs) in particular, tended to display distinct blurriness during very fast movements because of ghosting or the image left behind after switching. Current LCD technologies have not solved these issues completely.  Our expertise in flexoelectro-optical and blue phase devices has led to a level of innovative new approaches for flat-panel and wearable devices that could in some ways redefine how we access the HDR and video-rate response time. These and other topics will be reviewed, providing insights at both the applied and theoretical device levels.

The Novel Materials, Devices and Applications Lab at the Liquid Crystal Institute of Kent State University has continued to create high-performance and high-contrast electro-optical devices that provide leaps in capability for HDR and video-rate image response time. Most recently, we have developed a promising wide-temperature amorphous blue phase material (blue phase III) with novel physical behavior which is based on combining unique achromatic optical dark state and sub-millisecond switching behavior with hysteresis-free in voltage ramping.  The polymer-stabilized blue phase III (PSBP III) enables a wide temperature range and affords achromatic bright state and excellent dark state.  Our device now provides the first-ever approach to resolve LCDs issues of HDR and video-rate image.

The lecture will conclude with a discussion on a hot issue in LC technologies such as an in-plane-switching liquid crystal device based on uniform lying helix (ULH) alignment on polymerized surface is presented.  The surface alignment is formed by polymerizing a minute amount of a reactive monomer in a liquid crystal host to form nano-sized polymer fibers on the two substrates of the cell.  The short-pitch cholesteric comprises of a dual-frequency nematic liquid crystal, a twist-bend nematic liquid crystal and a chiral dopant.  Substantial improvements in electro-optical properties such as large field-induced tilt angle (> 45^o) and fast response time (~100 ms) have been achieved.  We will also present the analytical analyses of flexoelectric behavior and morphological properties of the polymer stabilized ULH.

Biography:

L.-C. Chien received his Ph.D. in Polymer Chemistry from the University of Southern Mississippi and joined Liquid Crystal Institute of Kent State in 1988.  His research interests include the studies of advanced functional materials, structures and surfaces as well as the innovative applications of such materials in displays electro-optical and photonic devices. He has published 150 articles, over 150 scientific proceedings and digest papers, edited 15 conference proceedings, three books and seven book chapters as well as 25 issued patents. He is a co-inventor of the bistable reflective cholesteric displays, polymer-stabilized liquid crystal display devices and technologies. Dr. Chien has been active in providing his services to professional society such as organizing and chair conferences as well as serve as an advisor or program committee on many international conferences.

His research in polymer and liquid crystal composites focuses on control of dimension, location and spatial distribution of phase separated polymers at the micro- and nano-scale on substrate surfaces or in the bulk.  His research in polymer dispersed, modified and stabilized liquid crystal materials have led to the development of advanced electro-optical, photonic and display devices such as reflective bistable displays, electrically switchable color filters, electrically-switchable gratings, and blue phases based devices.  The recently developed polymer dispersed and stabilized blue phases enable the fabrication of fast-switching spatial light modulators. 

His research in tailoring liquid crystal materials to provide control over structure, surface, morphology, and processing have led to the development of new electro-optical devices. For examples, research in active and stimuli-responsive low- and high-molar-mass materials have led to the development of artificial muscles, light emitting devices and organic thin film transistors; Furthermore, the active materials whose functionality are used for controlled- assembly or self-assembly of dispersed nanoparticles to ordered structures to enhance desired properties of functional devices.

For additional information:

Haiwei Chen

Seminar: "Laser-Driven Particle Acceleration Performed with Femtosecond PW Lasers" by Chang Hee Nam 3.31.16/2:00-3:00pm/ CREOL RM 103

Seminar: "Laser-Driven Particle Acceleration Performed with Femtosecond PW Lasers" by Chang Hee Nam

Thursday, March 31, 2016 2:00 PM to 3:00 PM
CREOL Room 103

 

Chang Hee Nam

Center for Relativistic Laser Science, Institute for Basic Science (IBS), Korea;

Dept of Physics and Photon Science, Gwangju Institute of Science and Technology (GIST), Korea

chnam@gist.ac.kr

Abstract: 

Research on laser-matter interactions has entered a new era in the relativistic regime thanks to the recent rapid progress of ultrashort high-power laser technology. High-power femtosecond lasers, producing outputs of 1 PW and 1.5 PW at 30 fs from two beamlines, have been developed. Using this PW laser facility at GIST, the Center for Relativistic Laser Science (CoReLS), a research center of Institute for Basic Science (IBS), works on experimental and theoretical investigations of relativistic laser-matter interactions. With the PW laser we succeeded in generating multi-GeV electrons through two stages of amplification and in producing protons with energy over 90 MeV. Further improvements in laser particle acceleration have been achieved by controlling experimental parameters such as spectral phase and polarization of lasers, and target conditions. Ultra-intense laser pulses, as the primary source, or short-wavelength radiation and energetic charged particles, as the secondary source, can expose matter under extreme conditions. The exploration of such extreme physical conditions will produce new outcomes in fundamental physics of laser-matter interactions.

Fig. 1 Experimental area showing two target chambers along with two pulse compression chambers for two PW laser beamlines

Biography:

Chang Hee Nam received his Ph. D. in plasma physics from Princeton University in 1988. After working at Princeton Plasma Physics Laboratory as a staff research physicist until 1989, he joined KAIST as a faculty member and became a full professor in 1998. He started the Coherent X-ray Research Center in 1999 with the funding from the Ministry of Science and Technology through the Creative Research Initiative Program. After finishing the CXRC program in 2012, he launched the Center for Relativistic Laser Science (CoReLS), a research center of Institute for Basic Science (IBS), for the exploration of relativistic laser-matter interactions using femtosecond PW lasers at GIST. He has received several awards including the scientist-of-the-month award from the Ministry of Science and Technology and the award from the National Academy of Science. He serves the scientific advisory committees of ELI - ALPS in Hungary and of ELI-NP in Romania. He is a fellow of the American Physical Society and also of the Optical Society of America.

For additional information:

Dr. Martin C. Richardson

Jenoptik optics company in the USA announces ISO-13485:2003 medical device registration

Jenoptik Optical Systems, LLC. (JOSI) is pleased to announce the registration of its quality management system to ISO-13485:2003 for medical device manufacturers or service providers. The certification covers both design and manufacture of medical devices.

01. March 2016

The company successfully obtained the registration through Intertek on its first audit attempt, complementing existing registrations to ISO 9001:2008. JOSI completed the audit in late January, 2016 and received the official certificate of registration in March, 2016.

“JOSI has a history of providing reliable, cost effective products to a highly regulated customer base. In addition, with manufacturing locations worldwide, Jenoptik allows for immediate access to high quality, low cost components. JOSI also offers vertical integration of optical design, manufacturing and system testing. Achieving this milestone is a tribute to our team and its commitment to growth in diagnostic instruments for life sciences,” remarks, Jay Kumler, President of Jenoptik Optical Systems.

“This registration paves the way for expansion into medical markets where exceeding customer and regulatory expectations is a prerequisite,” said, John Racette, JOSI Quality Director.

About Jenoptik and the Optical Systems division

As an integrated photonics group, Jenoptik operates within five divisions: Optical Systems, Healthcare & Industry, Automotive, Traffic Solutions and Defense & Civil Systems.

With its Optical Systems division Jenoptik is one of the few development and production partners worldwide for optical and micro-optical systems and precision components designed to meet the highest quality standards. The division offers solutions for optical glass, fused silica and crystals, infrared materials as well as plastic that can be coated in wavelengths from far infrared to DUV. Jenoptik also possesses outstanding expertise in the development and manufacture of micro-optics for beam shaping used in the semiconductor industry and laser material processing. The product portfolio of the division also includes solutions for optical information and communication technologies, as well as defense and security.