scholarly journals Color Filters: Plasmonic Color Filter and its Fabrication for Large-Area Applications (Advanced Optical Materials 2/2013)

2013 ◽  
Vol 1 (2) ◽  
pp. 109-109 ◽  
Author(s):  
Yun Seon Do ◽  
Jung Ho Park ◽  
Bo Yeon Hwang ◽  
Sung-Min Lee ◽  
Byeong-Kwon Ju ◽  
...  
Keyword(s):  
Optical Materials ◽  
Color Filter ◽  
Large Area ◽  
Color Filters

scholarly journals Efficient Design Method for Plasmonic Filter for Tuning Spectral Selectivity

Crystals ◽  
2020 ◽  
Vol 10 (6) ◽  
pp. 531
Author(s):  
Yun Seon Do
Keyword(s):  
Photonic Band Gap ◽  
Design Method ◽  
Color Filter ◽  
Efficient Design ◽  
Large Area ◽  
Nano Structure ◽  
Plasmonic Filter ◽  
Resonance Modes ◽  
Spectral Selectivity ◽  
Color Filters

Nano-structure-based color technologies have been reported as alternatives for conventional pigment- or dye-based color filters due to their simple design methods and durable characteristics. Since structure-based optical resonances accompany multiple resonance modes, spectral selectivity could be degraded. In this work, a simple and effective design of a plasmonic color filter that combines the plasmonic filter with one-dimensional photonic crystals. The introduced photonic crystal provides a photonic band gap, and it helps in suppressing the undesirable transmission peaks of the plasmonic color filter that originates from higher order resonance modes. Finally, the proposed design achieves high color purity. In addition, the simplicity of the design makes it both suitable for large-area fabrication and cost effective. This work is expected to provide a practical alternative to traditional color filters.

scholarly journals Hyperchromatic structural color for perceptually enhanced sensing by the naked eye

2020 ◽  
Vol 117 (48) ◽  
pp. 30107-30117
Author(s):  
Tahmid H. Talukdar ◽  
Bria McCoy ◽  
Sarah K. Timmins ◽  
Taufiquar Khan ◽  
Judson D. Ryckman
Keyword(s):  
High Performance ◽  
Limit Of Detection ◽  
Form Factors ◽  
Optical Filters ◽  
Color Filter ◽  
Structural Color ◽  
Label Free ◽  
Colorimetric Sensing ◽  
Large Area ◽  
Naked Eye

Colorimetric sensors offer the prospect for on-demand sensing diagnostics in simple and low-cost form factors, enabling rapid spatiotemporal inspection by digital cameras or the naked eye. However, realizing strong dynamic color variations in response to small changes in sample properties has remained a considerable challenge, which is often pursued through the use of highly responsive materials under broadband illumination. In this work, we demonstrate a general colorimetric sensing technique that overcomes the performance limitations of existing chromatic and luminance-based sensing techniques. Our approach combines structural color optical filters as sensing elements alongside a multichromatic laser illuminant. We experimentally demonstrate our approach in the context of label-free biosensing and achieve ultrasensitive and perceptually enhanced chromatic color changes in response to refractive index changes and small molecule surface attachment. Using structurally enabled chromaticity variations, the human eye is able to resolve ∼0.1-nm spectral shifts with low-quality factor (e.g., Q ∼ 15) structural filters. This enables spatially resolved biosensing in large area (approximately centimeters squared) lithography-free sensing films with a naked eye limit of detection of ∼3 pg/mm2, lower than industry standard sensors based on surface plasmon resonance that require spectral or angular interrogation. This work highlights the key roles played by both the choice of illuminant and design of structural color filter, and it offers a promising pathway for colorimetric devices to meet the strong demand for high-performance, rapid, and portable (or point-of-care) diagnostic sensors in applications spanning from biomedicine to environmental/structural monitoring.

scholarly journals Disordered zero-index metamaterials based on metal-induced crystallization

2019 ◽  
Vol 11 (1) ◽  
Author(s):  
Henning Galinski ◽  
Andreas Wyss ◽  
Mattia Seregni ◽  
Huan Ma ◽  
Volker Schnabel ◽  
...  
Keyword(s):  
Optical Materials ◽  
Effective Permittivity ◽  
Model System ◽  
Large Area ◽  
Disordered System ◽  
Semiconductor Interface ◽  
Metal Induced Crystallization ◽  
Control Light ◽  
Induced Crystallization ◽  
Zero Index

Abstract Zero-index (ZI) materials are synthetic optical materials with a vanishing effective permittivity and/or permeability at a given design frequency. Recently, it has been shown that the permeability of a zero-index host material can be deterministically tuned by adding photonic dopants. Here, we apply metal-induced crystallization (MIC) in quasi-random metal–semiconductor composites to fabricate large-area zero-index materials. Using Ag–Si as a model system, we demonstrate that the localized crystallization of the semiconductor at the metal/semiconductor interface can be used as a design parameter to control light interaction in such a disordered system. The induced crystallization generates new zero-index states corresponding to a hybridized plasmonic mode emerging from selective coupling of light to the Ångstrom-sized crystalline shell of the semiconductor. Photonic doping can be used to enhance the transmission in these disordered metamaterials, as shown by simulations. Our results establish novel large-area zero-index materials for wafer-scale applications and beyond.

Improving Contrast Ratio in Color Filters for AMLCD Devices

1997 ◽  
Vol 471 ◽  
Author(s):  
D. Y. Pai ◽  
G. J. Cernigliaro ◽  
T. A. Richardson
Keyword(s):  
Light Scattering ◽  
Contrast Ratio ◽  
Colloidal Suspensions ◽  
Fold Increase ◽  
Color Filter ◽  
Pigment Dispersion ◽  
Color Contrast ◽  
Imaging Characteristics ◽  
Negative Tone ◽  
Color Filters

ABSTRACTThe widespread use of pigmented color filters in the AMLCD industry has focused attention on their deficiencies, which include marginal film transmittance, significant depolarization and generally poor imaging characteristics for the corresponding imaging resists. These limitations result in diminished color filter contrast and curtailed brightness for the AMLCD device. Incremental color filter contrast improvements have been generated through use of smaller pigment particles which reduce, but do not eliminate, light scattering. As standard pigment synthetic and grind processes give only small color contrast gains, at a cost of protracted pigment manufacture time, another route to more significant gains in color filter contrast is probably necessary. The work herein describes our attempt at defining one viable approach to real improvements in the key color filter responses of reduced depolarization and improved color contrast.Our approach employs colorants prepared from colloidal suspensions of nanosized, mono-dispersed, dense silica spheres to which appropriate red, green and blue dyes are sorbed. Subsequent dispersion of each colorant nanocomposite in carrier polymer and photoimaging chemistry yields the corresponding negative-tone red, green and blue imageable photoresist. The synthesis and use of monodispersed colorant colloids has been described by Giesche and Matijevic for this and other related areas, but their utility is limited to applications not addressing the more advanced color filter requirements mentioned above. To those ends, our work focused on the synthesis, formulation and optical testing of nanocomposite colorant particles ranging from 10–30 nm in size, using dye chemistry which bridges compatibility between both silica nanosphere and carrier polymer, resulting in clear, highly transparent color films. Two independent optical tests comparing the color contrast on nanocomposite red films with coatings of similar transmittance prepared from reference red pigment dispersion provided rationalization that light scattering is significantly reduced in the nanocomposite film, as evidenced by the 3–10 fold increase in the color contrast ratios.

scholarly journals Color Filter Identification for Bidirectional Visible Light Communication

2018 ◽  
Vol 6 (2) ◽  
pp. 303
Author(s):  
ARSYAD RAMADHAN DARLIS ◽  
LITA LIDYAWATI ◽  
LUCIA JAMBOLA
Keyword(s):  
Visible Light ◽  
Communication Systems ◽  
Audio Signal ◽  
Visible Light Communication ◽  
Maximum Distance ◽  
Color Filter ◽  
Audio Frequency ◽  
Color Filters

ABSTRAKSaat ini, cahaya tampak dimanfaatkan oleh manusia hanya sebagai penerangan saja. Akan tetapi, beberapa penelitian telah membuktikan bahwa cahaya tampak dapat dimanfaatkan pula pada sistem komunikasi, yang dinamakan Visible Light Communication (VLC). Pada penelitian ini, sebuah metoda menggunakan color filter diidentifikasi dalam mengimplementasikan sistem bidirectional pada teknologi VLC. Dengan adanya penelitian ini, sebuah sistem bidirectional Visible Light Communication (Bi-VLC) dapat diimplementasikan dengan menggunakan color filter tertentu yang dipasangkan pada posisi uplink dan downlink. Sinyal informasi berupa sinyal audio ditansmisikan melalui VLC transmitter (Tx) yang dipasang color filter dan diterima oleh color filter pada VLC receiver (Rx) setelah melalui media cahaya. Pengujian menunjukan bahwa sistem telah dapat melewatkan sinyal pada frekuensi audio dengan jarak maksimum dari sistem adalah 2,3 m. Sedangkan pasangan color filter yang memiliki kinerja paling baik untuk BI-VLC adalah Azure (Tx) dengan Charteuse Green (Rx), Charteuse Green (Tx) dengan Charteuse Green (Rx), dan Rose (Tx) dengan Charteuse Green (Rx).Kata kunci: Bidirectional, Visible Light Communication (VLC), Color Filter, AudioABSTRACTCurrently, visible light are utilized by humans as illumination only. However, several research have proven that visible light can also be used in communication systems, called Visible Light Communication (VLC). In this research, a method of using color filters was identified for bidirectional systems on VLC technology. With this research, a bidirectional Visible Light Communication (Bi-VLC) system can be implemented using a specific color filter paired in uplink and downlink mode. The audio signal as information is transmitted through a VLC transmitter (Tx) installed by a color filter and received by the color filter on the VLC receiver (Rx) after going through the light media. The result shows that the system has been able to pass the signal at the audio frequency with the maximum distance of the system is 2.3 m. While the best performance of color filter pair for BI-VLC is Azure (Tx) with Charteuse Green (Rx), Charteuse Green (Tx) with Charteuse Green (Rx), and Rose (Tx) with Charteuse Green (Rx).Keywords: Bidirectional, Visible Light Communication (VLC), Color Filter, Audio

scholarly journals High throughput fabrication of large-area plasmonic color filters by soft-X-ray interference lithography

2016 ◽  
Vol 24 (17) ◽  
pp. 19112 ◽  
Author(s):  
Libin Sun ◽  
Xiaolin Hu ◽  
Qingjun Wu ◽  
Liansheng Wang ◽  
Jun Zhao ◽  
...  
Keyword(s):  
High Throughput ◽  
Interference Lithography ◽  
Large Area ◽  
X Ray ◽  
Color Filters

scholarly journals Thermophotovoltaics: Large-Area Ultrabroadband Absorber for Solar Thermophotovoltaics Based on 3D Titanium Nitride Nanopillars (Advanced Optical Materials 22/2017)

2017 ◽  
Vol 5 (22) ◽  
Author(s):  
Manohar Chirumamilla ◽  
Anisha Chirumamilla ◽  
Yuanqing Yang ◽  
Alexander S. Roberts ◽  
Peter Kjaer Kristensen ◽  
...  
Keyword(s):  
Titanium Nitride ◽  
Optical Materials ◽  
Large Area
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