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Open AccessArticle

An Optimization of Two-Dimensional Photonic Crystals at Low Refractive Index Material

1
School of Engineering Physics, Hanoi University of Science and Technology, No. 1 Dai Co Viet, Hai Ba Trung, Hanoi 100000, Vietnam
2
Institute of Materials Science, Vietnam Academy of Science and Technology, 18 Hoang Quoc Viet, Cau Giay, Hanoi 100000, Vietnam
3
Laboratoire de Photonique Quantique et Moléculaire, UMR 8537, École Normale Supérieure Paris-Saclay, Centrale Supélec, CNRS, Université Paris-Saclay, 61 avenue de Président Wilson, 94235 Cachan, France
*
Authors to whom correspondence should be addressed.
Crystals 2019, 9(9), 442; https://doi.org/10.3390/cryst9090442
Received: 1 August 2019 / Revised: 17 August 2019 / Accepted: 21 August 2019 / Published: 24 August 2019
(This article belongs to the Special Issue Sonic and Photonic Crystals)
Photonic crystal (PC) is usually realized in materials with high refractive indices contrast to achieve a photonic bandgap (PBG). In this work, we demonstrated an optimization of two-dimensional PCs using a low refractive index polymer material. An original idea of assembly of polymeric multiple rings in a hexagonal configuration allowed us to obtain a circular-like structure with higher symmetry, resulting in a larger PBG at a low refractive index of 1.6. The optical properties of such newly proposed structure are numerically calculated by using finite-difference time-domain (FDTD) method. The proposed structures were realized experimentally by using a direct laser writing technique based on low one-photon absorption method. View Full-Text
Keywords: photonic crystals; photonic bandgaps; polymer materials; direct laser writing photonic crystals; photonic bandgaps; polymer materials; direct laser writing
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MDPI and ACS Style

Nguyen, T.-P.; Tien, T.Q.; Tong, Q.C.; Lai, N.D. An Optimization of Two-Dimensional Photonic Crystals at Low Refractive Index Material. Crystals 2019, 9, 442.

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