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

Thanh-Phuong Nguyen, Tran Quoc Tien, Quang Cong Tong, and Ngoc Diep Lai, Crystals 9, 442 (2019)

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

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