Bio-inspired Structural Colors and Their Applications

2021 ◽  
Author(s):  
Fengxiang Chen ◽  
Ya Huang ◽  
Run Li ◽  
Shiliang Zhang ◽  
Baoshun Wang ◽  
...  
Keyword(s):  
Visible Light ◽  
Incident Light ◽  
Nanostructured Surfaces ◽  
Structural Colors

Structural colors, generated by the interaction of interference, diffraction, and scattering between incident light and periodic nanostructured surfaces with features of the same scale with incident visible light wavelengths, have...

Synthesis of single-crystalline GeS nanoribbons for high sensitivity visible-light photodetectors

2015 ◽  
Vol 3 (31) ◽  
pp. 8074-8079 ◽  
Author(s):  
Changyong Lan ◽  
Chun Li ◽  
Yi Yin ◽  
Huayang Guo ◽  
Shuai Wang
Keyword(s):  
Visible Light ◽  
Vapor Deposition ◽  
High Performance ◽  
Incident Light ◽  
Chemical Vapor ◽  
High Sensitivity ◽  
Single Crystalline ◽  
Promising Application ◽  
Photo Detection ◽  
First Time

Single-crystalline GeS nanoribbons were synthesized by chemical vapor deposition for the first time. The nanoribbon photodetectors respond to the entire visible incident light with a response edge at around 750 nm and a high responsivity, indicating their promising application for high performance broadband visible-light photo-detection.

Coloration of Surfaces with Periodic Microstructures Replicated by Non-isothermal Precision Molding

2020 ◽  
Author(s):  
Yong Zhong ◽  
Ruxu Du ◽  
Lin Zhang ◽  
Allen Y. Yi
Keyword(s):  
Periodic Structures ◽  
Low Cost ◽  
Incident Light ◽  
Optical Diffraction ◽  
Molding Process ◽  
Structural Colors ◽  
Periodic Grating ◽  
Periodic Microstructures ◽  
Light Beams ◽  
Micro Structures

Abstract Micro/nano periodic structures are generally adopted in diffraction gratings. As an important optical component, the diffraction grating has the capability to split and diffract incident white light beams into iridescent beams dispersing to different directions. The appearance of coloration is a form of structural coloration by optical diffraction. In this paper, the non-isothermal precision molding is introduced for rapid & precise replication of periodic micro/nano grating structures, which are employed to render iridescent colors onto surfaces. Firstly, the effect of colorization and periodic grating profiles are theoretically analyzed. Secondly, different periodic micro gratings on silicon wafer, which are generally generated by photolithography, are employed in non-isothermal precision molding process as mold inserts. The molding result indicates that the periodic grating space and depth of grating structures can be precisely replicated from the mold inserts to polymer substrates. Subsequently, the split and iridescent color effects are demonstrated with monochromatic & white incident light beam and compared between samples with different periodic grating spaces. The optical effects of the replicated micro-structures confirm the feasibility of this method. The proposed non-isothermal precision molding process provides an alternative manufacturing option for realizing structural colors with large volume and low cost.

RAYLEIGH SCATTERING OF CONDENSED MATTER

1953 ◽  
Vol 31 (7) ◽  
pp. 1170-1181 ◽  
Author(s):  
O. Theimer ◽  
E. Lell
Keyword(s):  
Visible Light ◽  
Rayleigh Scattering ◽  
Optical Glass ◽  
Condensed Matter ◽  
Incident Light ◽  
Relative Maximum

The scattering power S(λ) = Is/Id (Is, Id are the intensities of the scattered and the incident light) for visible light is investigated experimentally for ordinary glass, optical glass, water, and air. It is found that S(λ) for glass shows pronounced deviations from Rayleigh's 1/λ4 law, e.g., a relative maximum of S(λ) for λ = 5200 Å in the case of ordinary glass. A theory for the Rayleigh scattering of condensed matter is developed and compared with the ideas brought forward by Fürth and Humphreys-Owen in 1951. It is shown that the maxima of S(λ) observed by these authors and in the present work can be equally well derived from localized lattice imperfections or from the mosaic blocks considered by Fürth.

scholarly journals The Use of Tunable Optical Absorption Plasmonic Au and Ag Decorated TiO2 Structures as Efficient Visible Light Photocatalysts

Catalysts ◽  
2020 ◽  
Vol 10 (1) ◽  
pp. 139 ◽  
Author(s):  
Xiaohong Yang ◽  
Yan Wang ◽  
Lingtong Zhang ◽  
Haitao Fu ◽  
Peng He ◽  
...  
Keyword(s):  
Visible Light ◽  
Noble Metal ◽  
Environmental Remediation ◽  
Noble Metals ◽  
Incident Light ◽  
Perfect Match ◽  
Energy Utilization ◽  
Plasmonic Enhancement ◽  
Research Attention ◽  
Tio2 Particles

Exploring solar-excited heterogeneous photocatalysts by taking advantage of surface plasmon resonance (SPR) has drawn growing research attention. As it could help to pave the way for global sustainable development. The decoration of TiO2 particles with noble metals possessing SPR effects is regarded as one of the most effective solutions. The perfect match of the SPR absorption band with the spectrum of incident light is an essential factor for plasmonic enhancement. However, modifying with sole noble metal is often limited as it tunes wavelength of only several nanometers. To overcome this drawback, an alternative approach can be offered by decoration with more than one noble metal. For instance, Au-Ag co-decoration displays greatly adjustable, composition-dependent SPR agent over a broad range of the visible light spectrum (ca. from 415 to 525 nm). Hence Au-Ag complex is a remarkable candidate for tuning the photo adsorption of TiO2 from UV to visible light. This study presents a novel and tailored method for the fabrication of Au-Ag co-modified TiO2 particles, and how Au-Ag dependent SPR was applied as the visible light-responsive TiO2 based photocatalysts in a simple but reliable way. The fabricated Au-Ag co-decorated TiO2 (AuxAg(1−x)/TiO2) was characterized and proved to own excellent stability and large specific surface area. The optimization of these particles against the wavelength of maximal solar light intensity was confirmed by photo degradation of methylene blue under visible light radiation. This work may provide further insight into the design of TiO2-based composites with improved photocatalytic properties for environmental remediation and renewable energy utilization.

scholarly journals Detection of nanoparticles suspended in a light scattering medium

2021 ◽  
Vol 11 (1) ◽  
Author(s):  
Yan Ye ◽  
David Y. H. Pui
Keyword(s):  
Light Scattering ◽  
Visible Light ◽  
Light Wave ◽  
Incident Light ◽  
Scattering Medium ◽  
Light Interference ◽  
Potential Applications ◽  
Power Frequency ◽  
Suspended Nanoparticles ◽  
Incident Light Wave

AbstractIntentionally intensifying the light scattering of medium molecules can allow the detection of suspended nanoparticles under conditions not suitable for conventional optical microscopies or laser particle counters. Here, we demonstrate how the collective light scattering of medium molecules and nanoparticles is imaged in response to the power, frequency, and oscillating direction of the incident light wave electric field, and how this response can be used to distinguish between nanoparticles and microparticles, such as viruses or bacteria. Under conditions that the medium light scattering is intensified, suspended nanoparticles appear as magnified shiny moving dots superimposed on the quasi-steady background of medium light scattering. Utilizing the visual enlargement resulted from the enhanced light scattering and possible light interference, we can detect directly suspended nanoparticles that are much smaller than visible light wavelengths even in unopened water bottles or other large containers. This suggests new approaches for detecting nanoparticles with many potential applications.

Structrual Coloration of Surfaces With Microstructures Replicated by Non-Isothermal Precision Glass Molding

2020 ◽  
Author(s):  
Yong Zhong ◽  
Ruxu Du ◽  
Lin Zhang ◽  
Allen Y. Yi
Keyword(s):  
Periodic Structures ◽  
Low Cost ◽  
Incident Light ◽  
Molding Process ◽  
Glass Molding ◽  
Precision Glass Molding ◽  
Structural Colors ◽  
Periodic Grating ◽  
Light Beams ◽  
Micro Structures

Abstract Micro/nano periodic structures are generally adopted in diffraction gratings. As an important optical component, the diffraction grating has the capability to split and diffract incident white light beams into iridescent beams travelling in different directions. The emerging coloration is a form of structural coloration. In this paper, the non-isothermal precision glass molding is introduced for fast replication of periodic grating structures, which are employed to render iridescent colors on surfaces. Firstly, the effect of colorization and periodic grating profiles is theoretically analyzed. Secondly, different periodic micro gratings on silicon wafer, which are generally generated by photolithography, are employed in non-isothermal precision glass molding process as mold inserts. The molding result indicates that the periodic grating space and depth of grating structures can be precisely replicated from the mold inserts to polymer substrates. Subsequently, the split and iridescent color effects are demonstrated with monochromatic & white incident light beam and compared between samples with different periodic grating spaces. The optical effects of the replicated micro-structures confirm the feasibility of this method. The proposed non-isothermal precision glass molding process provides an alternative manufacturing option for realizing structural colors with large-volume and low-cost.

All-dielectric high saturation structural colors with Si3N4 metasurface

2020 ◽  
Vol 34 (14) ◽  
pp. 2050142
Author(s):  
Yunfan Hong ◽  
Yufang Lei ◽  
Xiaoming Fang ◽  
Xingyi Li ◽  
Wenlong Wen ◽  
...  
Keyword(s):  
Incident Angle ◽  
Structural Parameters ◽  
Incident Light ◽  
Research Area ◽  
Structural Color ◽  
Polarization Angle ◽  
Structural Colors ◽  
Environmental Friendly ◽  
Half Height ◽  
Color Displays

Structural colors engineering as a promising research area provides a high-resolution and environmental-friendly sustainable colors implementation. Here, metasurface-based concept was used to design waveguides and gratings of Si3N4 material on silicon dioxide substrates. The shift of reflection peaks can be controlled by structural parameters and efficiencies exceeded 90% with half height and width less than 10 nm. This induced structural color with superior saturation. Moreover, such nanostructures showed good sensitivity to polarization angle and incident angle of incident light. The proposed coloring devices look promising for applications in active color displays, imaging devices, and anti-counterfeiting and so on.

scholarly journals ANGLE-DEPENDENT TRANSMISSION FOR VISIBLE LIGHT OF MAGNETIC GRANULAR THIN FILMS

2018 ◽  
Vol 54 (5A) ◽  
pp. 27
Author(s):  
Giap Van Cuong
Keyword(s):  
Magnetic Field ◽  
Thin Films ◽  
External Magnetic Field ◽  
Visible Light ◽  
Angular Dependence ◽  
Incident Light ◽  
Granular Films ◽  
Photon Interaction ◽  
Surface Normal

      The transmission for visible light (T), with wavelengths from 560 to 695 nm, was investigated at various light incident angles of 0 ¸ 45 degree for the surface normal of samples (φ) as a function of Co contents for magnetic granular films Cox-(Al2O3)1-x, where x = 0.10 ¸ 0.45. This investigation was carried out under an external magnetic field fixed at 4 kOe to ensure for all the Co-granule magnetization being kept in a fixed incident light propagating direction. Results showed a rather remarkable angular dependence of T(φ) on the Co content for different wavelengths. It was attributed the behavior of this to be dependent on the so-called magnon-photon interaction.

scholarly journals Melanin-based structural coloration of birds and its biomimetic applications

2021 ◽  
Vol 51 (1) ◽  
Author(s):  
Deok-Jin Jeon ◽  
Suejeong Paik ◽  
Seungmuk Ji ◽  
Jong-Souk Yeo
Keyword(s):  
Optical Properties ◽  
Visible Light ◽  
Recent Progress ◽  
Current Understanding ◽  
Structural And Optical Properties ◽  
Structural Coloration ◽  
Nanoscale Structures ◽  
Structural Colors ◽  
Self Assembling

AbstractMelanin has been a widely researched pigment by scientists for decades as it is undoubtedly the most ubiquitous and ancient pigment found in nature. Melanin plays very significant roles in structural plumage colors in birds: it has visible light-absorbing capabilities, and nanoscale structures can be formed by self-assembling melanin granules. Herein, we review recent progress on melanin-based structural coloration research. We hope that this review will provide current understanding of melanin’s structural and optical properties, natural coloration mechanisms, and biomimetic methods to implement artificial melanin-based structural colors.

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