title: Large complete bandgaps in a two-dimensional square photonic crystal with isolated single-atom dielectric rods in air.
abstract: It is well known that the square lattice of isolated single-atom dielectric rods in air does not give rise to complete bandgaps even when asymmetry is introduced to lift some degeneracy. However, in this paper, a new kind of two-dimensional square photonic crystal with isolated single-atom dielectric rods in air formed by holographic lithography is proposed, and the relation between their photonic bandgap properties and their specific holographic design are systematically analyzed. In addition to the large complete relative bandgap, namely 9.68% gap/midgap ratio for the dielectric constant contrast of 13.6:1, this structure has very large tolerance on the system parameters and fabrication conditions. This fact can greatly relax the experimental requirements. This work may demonstrate the unique feature and advantages of photonic crystals made by the holographic method and provide a guideline for their design and fabrication.
authors.affiliation: Department of Optics, Shandong University, Jinan 250100, People's Republic of China.
authors.forename: X L
authors.initials: XL
authors.lastname: Yang
authors.forename: L Z
authors.initials: LZ
authors.lastname: Cai
authors.forename: Y R
authors.initials: YR
authors.lastname: Wang
authors.forename: G Y
authors.initials: GY
authors.lastname: Dong
authors.forename: X X
authors.initials: XX
authors.lastname: Shen
authors.forename: X F
authors.initials: XF
authors.lastname: Meng
authors.forename: Y
authors.initials: Y
authors.lastname: Hu