Large-angle polarization insensitive negative refraction in the diagonal array photonic crystal. (21st October 2019)

• Record Type: Journal Article
• Authors: Zaremanesh, Mansour; Noori, Mina
• Is Part Of: Physica scripta. Volume 94:Number 12(2019)
• Publication Date: 2019-10-21
• Subjects: negative refraction -- polarization insensitive -- photonic crystal -- PWE -- FDTD; Physics -- Periodicals; 530.05
• DOI: 10.1088/1402-4896/ab47ce
• Languages: English
• ISSNs: 0031-8949

Abstract

Abstract: In this article, the all-angle and polarization insensitive negative refraction (NR) properties are investigated in a 2D diagonal array photonic crystal. The rod-type structure presents the all-angle NR for TM2 in a bandwidth of Δ ω / ω c ∼ 20%. The all-angle NR does not hold for the hole-type structure due to the overlap of the 2nd and the 3rd bands, however, the polarization insensitive negative refraction is achieved for incidence angles of over θ in = ±20° in a bandwidth of Δ ω / ω c = 10.6% in the second band. The proposed structure has been investigated using the PWE and the FDTD methods, regarding fabrication challenges in Si technology for the central operating wavelength of λ c = 1550 nm.