scholarly journals Bright-White Beetle Scales Optimise Multiple Scattering of Light

2014 ◽  
Vol 4 (1) ◽  
Author(s):  
Matteo Burresi ◽  
Lorenzo Cortese ◽  
Lorenzo Pattelli ◽  
Mathias Kolle ◽  
Peter Vukusic ◽  
...  
Keyword(s):  
Refractive Index ◽  
Multiple Scattering ◽  
Coherent Scattering ◽  
Mean Free Path ◽  
High Refractive Index ◽  
Light Transport ◽  
Scattering Media ◽  
Time Resolved ◽  
Low Mass ◽  
High Level

Abstract Whiteness arises from diffuse and broadband reflection of light typically achieved through optical scattering in randomly structured media. In contrast to structural colour due to coherent scattering, white appearance generally requires a relatively thick system comprising randomly positioned high refractive-index scattering centres. Here, we show that the exceptionally bright white appearance of Cyphochilus and Lepidiota stigma beetles arises from a remarkably optimised anisotropy of intra-scale chitin networks, which act as a dense scattering media. Using time-resolved measurements, we show that light propagating in the scales of the beetles undergoes pronounced multiple scattering that is associated with the lowest transport mean free path reported to date for low-refractive-index systems. Our light transport investigation unveil high level of optimisation that achieves high-brightness white in a thin low-mass-per-unit-area anisotropic disordered nanostructure.

Influence of Fine-Dispersed Dielectric Particles on Dye Luminescence in a Polymer Matrix

2004 ◽  
Vol 99-100 ◽  
pp. 153-156 ◽  
Author(s):  
E. Tikhonov ◽  
Vasil P. Yashchuk ◽  
O. Prygodjuk ◽  
V. Bezrodny ◽  
Yu. Filatov
Keyword(s):  
Refractive Index ◽  
Multiple Scattering ◽  
Polymer Matrix ◽  
Organic Dye ◽  
Sample Thickness ◽  
Luminescence Spectra ◽  
Scattering Media ◽  
Dielectric Particles ◽  
Multiple Light Scattering ◽  
Luminescence Light

The behaviour of the luminescence spectra of the organic dye R6G in a multiple scattering polymer matrix was studied with reference to the parameters of the scattering media. It was found that some of the luminescent parameters depend on the concentration of scattering particles, the refractive index of the scattering particles and the sample thickness. As it was shown, that the reason for these dependences is the reabsorption of luminescence light enhanced by multiple light scattering. In addition, an increase in the absorption caused by multiple scattering was observed.

scholarly journals High-Refractive-Index Materials for Giant Enhancement of the Transverse Magneto-Optical Kerr Effect

Sensors ◽  
2020 ◽  
Vol 20 (4) ◽  
pp. 952
Author(s):  
Edwin Moncada-Villa ◽  
J. Ricardo Mejía-Salazar
Keyword(s):  
Refractive Index ◽  
Data Storage ◽  
Kerr Effect ◽  
High Refractive Index ◽  
Dielectric Substrate ◽  
Optical Kerr Effect ◽  
Plasmonic Structures ◽  
Optical Effects ◽  
Magneto Optical Kerr Effect ◽  
High Level

The ability of plasmonic structures to confine and enhance light at nanometer length scales has been traditionally exploited to boost the magneto-optical effects in magneto-plasmonic structures. These platforms allows for light control via externally applied magnetic fields, which is of prime importance for sensing, data storage, optical-isolation, and telecommunications applications. However, applications are hindered by the high-level of ohmic losses associated to metallic and ferromagnetic components. Here, we use a lossless all-dielectric platform for giant enhancement of the magneto-optical effects. Our structure consists of a high-refractive index dielectric film on top of a magnetic dielectric substrate. We numerically demonstrate an extraordinarily enhanced transverse magneto-optical Kerr effect due to the Fabry–Perot resonances supported by the high-refractive index slab. Potential applications for sensing and biosensing are also illustrated in this work.

Accelerated Discovery of High-Refractive-Index Polyimides via First-Principles Molecular Modeling, Virtual High-Throughput Screening, and Data Mining

2019 ◽  
Author(s):  
Mohammad Atif Faiz Afzal ◽  
Mojtaba Haghighatlari ◽  
Sai Prasad Ganesh ◽  
Chong Cheng ◽  
Johannes Hachmann
Keyword(s):  
Data Mining ◽  
Refractive Index ◽  
High Throughput ◽  
First Principles ◽  
High Throughput Screening ◽  
Large Scale ◽  
Computational Study ◽  
High Refractive Index ◽  
Structural Features ◽  
Learning Program

<div>We present a high-throughput computational study to identify novel polyimides (PIs) with exceptional refractive index (RI) values for use as optic or optoelectronic materials. Our study utilizes an RI prediction protocol based on a combination of first-principles and data modeling developed in previous work, which we employ on a large-scale PI candidate library generated with the ChemLG code. We deploy the virtual screening software ChemHTPS to automate the assessment of this extensive pool of PI structures in order to determine the performance potential of each candidate. This rapid and efficient approach yields a number of highly promising leads compounds. Using the data mining and machine learning program package ChemML, we analyze the top candidates with respect to prevalent structural features and feature combinations that distinguish them from less promising ones. In particular, we explore the utility of various strategies that introduce highly polarizable moieties into the PI backbone to increase its RI yield. The derived insights provide a foundation for rational and targeted design that goes beyond traditional trial-and-error searches.</div>

Preparation and Characterization of Polyvinylidene Fluoride/ZrO2-TiO2 Optical Film with Wide Band Gap and High Refractive Index

2013 ◽  
Vol 28 (6) ◽  
pp. 671-676 ◽  
Author(s):  
Yu-Qing ZHANG ◽  
Li-Li ZHAO ◽  
Shi-Long XU ◽  
Chao ZHANG ◽  
Xiao-Ying CHEN ◽  
...  
Keyword(s):  
Refractive Index ◽  
Band Gap ◽  
Polyvinylidene Fluoride ◽  
Wide Band ◽  
High Refractive Index ◽  
Wide Band Gap ◽  
Optical Film

Three-band perfect absorber with high refractive index sensing based on active tunable Dirac semimetal

2021 ◽  
Author(s):  
Zhiyou Li ◽  
Zao Yi ◽  
Tinting Liu ◽  
Li Liu ◽  
Xifang Chen ◽  
...  
Keyword(s):  
Refractive Index ◽  
High Refractive Index ◽  
Gold Layer ◽  
Perfect Absorber ◽  
Refractive Index Sensing ◽  
Dirac Semimetal

In this paper, we designed a three-band narrowband perfect absorber based on Bulk Dirac semimetallic (BDS) metamaterials. The absorber consists of a hollow Dirac semimetallic layer above, a gold layer...

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