Fabrication of sub-wavelength periodic structures upon high-refractive-index glasses by precision glass molding

2007 ◽  
Author(s):  
T. Mori ◽  
K. Hasegawa ◽  
T. Hatano ◽  
H. Kasa ◽  
K. Kintaka ◽  
...  
Keyword(s):  
Refractive Index ◽  
Periodic Structures ◽  
High Refractive Index ◽  
Glass Molding ◽  
Precision Glass Molding ◽  
Sub Wavelength

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.

scholarly journals High Refractive Index Electromagnetic Devices in Printed Technology Based on Glide-Symmetric Periodic Structures

2020 ◽  
Vol 10 (9) ◽  
pp. 3216 ◽  
Author(s):  
Philip Arnberg ◽  
Oscar Barreira Petersson ◽  
Oskar Zetterstrom ◽  
Fatemeh Ghasemifard ◽  
Oscar Quevedo-Teruel
Keyword(s):  
Refractive Index ◽  
Printed Circuit Board ◽  
Periodic Structures ◽  
High Refractive Index ◽  
Circuit Board ◽  
Beneficial Effects ◽  
Electromagnetic Devices ◽  
Symmetric Structure ◽  
Peak Transmission ◽  
5 Ghz

We demonstrate the beneficial effects of introducing glide symmetry in a two-dimensional periodic structure. Specifically, we investigate dielectric parallel plate waveguides periodically loaded with Jerusalem cross slots in three configurations: conventional, mirror- and glide-symmetric. Out of these three configurations, it is demonstrated that the glide-symmetric structure is the least dispersive and has the most isotropic response. Furthermore, the glide-symmetric structure provides the highest effective refractive index, which enables the realization of a broader range of electromagnetic devices. To illustrate the potential of this glide-symmetric unit cell, a Maxwell fish-eye lens is designed to operate at 5 GHz. The lens is manufactured in printed circuit board technology. Simulations and measurements are in good agreement and a measured peak transmission coefficient of −0.5 dB is achieved.

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>

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