scholarly journals High-Contrast OLEDs with High-Efficiency

10.5772/9873 ◽  
2010 ◽  
Author(s):  
Daniel Poitras ◽  
Christophe Py ◽  
Chien-Cheng Kuo
Keyword(s):  
High Efficiency ◽  
High Contrast

scholarly journals AUTOMATIC ESTIMATION OF SIZE PARAMETERS USING VERIFIED COMPUTERIZED STEREOANALYSIS

2011 ◽  
Vol 24 (1) ◽  
pp. 41 ◽  
Author(s):  
Peter R Mouton ◽  
Joel Durgavich ◽  
Donald K Ingram
Keyword(s):  
Biomedical Research ◽  
High Efficiency ◽  
Signal To Noise Ratio ◽  
Performance Testing ◽  
High Signal ◽  
High Contrast ◽  
Size Estimation ◽  
Labor Costs ◽  
Biological Objects ◽  
Novel Approach

State-of-the-art computerized stereology systems combine high-resolution video microscopy and hardwaresoftware integration with stereological methods to assist users in quantifying multidimensional parameters of importance to biomedical research, including volume, surface area, length, number, their variation and spatial distribution. The requirement for constant interactions between a trained, non-expert user and the targeted features of interest currently limits the throughput efficiency of these systems. To address this issue we developed a novel approach for automatic stereological analysis of 2-D images, Verified Computerized Stereoanalysis (VCS). The VCS approach minimizes the need for user interactions with high contrast [high signal-to-noise ratio (S:N)] biological objects of interest. Performance testing of the VCS approach confirmed dramatic increases in the efficiency of total object volume (size) estimation, without a loss of accuracy or precision compared to conventional computerized stereology. The broad application of high efficiency VCS to high-contrast biological objects on tissue sections could reduce labor costs, enhance hypothesis testing, and accelerate the progress of biomedical research focused on improvements in health and the management of disease.

scholarly journals Design and manufacturing of a multi-zone phase-shifting coronagraph mask for extremely large telescopes

2020 ◽  
Vol 635 ◽  
pp. A126
Author(s):  
P. Martinez ◽  
M. Beaulieu ◽  
K. Barjot ◽  
O. Guyon ◽  
C. Gouvret ◽  
...  
Keyword(s):  
Focal Plane ◽  
Depth Distribution ◽  
High Efficiency ◽  
Dynamic Range ◽  
Phase Shifting ◽  
Average Error ◽  
High Contrast ◽  
Contrast Imaging ◽  
Zone Depth ◽  
Large Telescopes

Context. High-contrast imaging of exoplanets around nearby stars with future large-segmented apertures requires starlight suppression systems optimized for complex aperture geometries. Future extremely large telescopes (ELTs) equipped with high-contrast instruments operating as close as possible to the diffraction limit will open a bulk of targets in the habitable zone around M-stars. In this context, the phase-induced amplitude apodization complex mask coronagraph (PIAACMC) is a promising concept for high-efficiency coronagraphic imaging at small angular separations with segmented telescopes. Aims. The complex focal plane mask of the PIAACMC is a multi-zone, phase-shifting mask comprised of tiled hexagons that vary in depth. The mask requires micro-fabrication techniques because it is generally made of hundreds micron-scale hexagonal zones with depths ranging over a few microns. We aim to demonstrate that the complex focal plane mask of a PIAACMC with a small inner working angle can be designed and manufactured for segmented apertures. Methods. We report on the numerical design, specifications, manufacturing, and characterization of a PIAACMC complex focal plane mask for the segmented pupil experiment for exoplanet detection facility. Results. Our PIAACMC design offers an inner working angle of 1.3 λ/D and is optimized for a 30% telescope-central-obscuration ratio including six secondary support structures (ESO/ELT design). The fabricated reflective focal plane mask is made of 499 hexagons, and the characteristic size of the mask features is 25 μm, with depths ranging over ±0.4 μm. The mask sag local deviation is measured to an average error of 3 nm and standard deviation of 6 nm rms. The metrological analysis of the mask using interferential microscopy gives access to an in-depth understanding of the component’s optical quality, including a complete mapping of the zone depth distribution zone-depth distribution. The amplitude of the errors in the fabricated mask are within the wavefront control dynamic range. Conclusions. We demonstrate the feasibility of fabricating and characterizing high-quality PIAA complex focal plane masks.

P‐112: High‐Efficiency and High‐contrast Automotive LCD Backlight Using an Advanced Light‐Guide with a Multi‐Prism Array (ALMA)

2021 ◽  
Vol 52 (1) ◽  
pp. 1266-1268
Author(s):  
Shugo Yagi ◽  
Yuichi Kanbayashi ◽  
Satoshi Tsubooka ◽  
Junichi Masuda
Keyword(s):  
High Efficiency ◽  
Light Guide ◽  
High Contrast

OPTICAL AXIS GRATINGS IN LIQUID CRYSTALS AND THEIR USE FOR POLARIZATION INSENSITIVE OPTICAL SWITCHING

2009 ◽  
Vol 18 (01) ◽  
pp. 1-47 ◽  
Author(s):  
S. R. NERSISYAN ◽  
N. V. TABIRYAN ◽  
D. M. STEEVES ◽  
B. R. KIMBALL
Keyword(s):  
Liquid Crystals ◽  
Optical System ◽  
Optical Switching ◽  
High Efficiency ◽  
Optical Axis ◽  
Incident Light ◽  
Density Level ◽  
High Contrast ◽  
Large Area ◽  
Power Radiation

The ability of optical axis gratings (OAGs) to fully transfer the energy of an unpolarized incident light beam into the ±1st diffraction orders is explored below for development of a polarization-independent optical system with nonlinear transmission. Diffractive properties of OAGs based on azo dye doped liquid crystals (azo LCs) are efficiently controlled with low power radiation. Switching from diffractive to transmissive states of the OAG takes place within 50 ms at 60 W/cm2 power density level, while the diffractive state is restored within ~ 1 s in the absence of radiation. High contrast optical switching is demonstrated with violet as well as green laser beams. A photoswitchable OAG is paired with a light-insensitive OAG in diffraction compensation configuration to obtain an optical system switchable from high to low transmission state. The thinness of OAGs required for high contrast switching ensures high overall transmission of the system. Given also the spectrally and angularly broadband nature of OAG diffraction and the capability of azo LC material systems to respond both to cw as well as short laser pulses makes the optical system under discussion very promising for optical switching applications. Presentation of these results is preceded by an "opinionated" review of prior developments and demystifying of the fabrication technique of high efficiency large area OAGs.

High-contrast and high-efficiency top-emitting organic light-emitting devices

2006 ◽  
Vol 85 (1) ◽  
pp. 95-97 ◽  
Author(s):  
W.F. Xie ◽  
H.Y. Sun ◽  
C.W. Law ◽  
C.S. Lee ◽  
S.T. Lee ◽  
...  
Keyword(s):  
High Efficiency ◽  
High Contrast ◽  
Light Emitting ◽  
Light Emitting Devices ◽  
Organic Light ◽  
Organic Light Emitting Devices

scholarly journals Phase-Change Metasurface by U-Shaped Atoms for Photonic Switch with High Contrast Ratio

Coatings ◽  
2021 ◽  
Vol 11 (12) ◽  
pp. 1499
Author(s):  
Xiaoyu Ma ◽  
Ruirui Song ◽  
Zhihua Fan ◽  
Shaolin Zhou
Keyword(s):  
Phase Transition ◽  
Phase Change ◽  
High Efficiency ◽  
Contrast Ratio ◽  
Active Phase ◽  
Hybrid Design ◽  
High Contrast ◽  
Metal Insulator Metal ◽  
Phase Tuning ◽  
Low Efficiency

Currently, diverse metasurfaces act as exotic platforms enabling versatile wave regulations in deep-subwavelength level for ultracompact integration. To address the existing issues of passive nature and low-efficiency in wave controls, one type of metasurface for active phase tuning is proposed in this paper by integrating the phase-change dielectric of Ge2Sb2Te5 into the of U-shaped meta-atoms. Specifically, the phase-change-based hybrid design of Ge2Sb2Te5-integrated metalens switch is demonstrated and numerically confirmed with switchable focusing. The well-defined metal-insulator-metal (MIM) setup is used to enable high-efficiency reflective wavefront tunig and practical Ge2Sb2Te5 phase transition. Upon the phase transition between the amorphous and crystalline states of Ge2Sb2Te5, the cross-polarized component of reflected waves in the given wavelength range is switched “on” (maximized) for as-designed geometric phase plus meta-lensing or “off” (minimized) for no lensing with ultra-high contrast ratio of ~36:1. As a result, such hybrid design of phase-change metasurface may provide a promising route for active photonic device with compact integration.

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