Nanolayer-embedded pseudo-photonic crystals. (9th September 2019)

• Record Type: Journal Article
• Authors: Park, Byoung Jun; Jin, Young-Ho; Park, Nu-Ri; Kim, Jin Tae; Kim, Myung-Ki
• Is Part Of: Nanotechnology. Volume 30:Number 47(2019)
• Publication Date: 2019-09-09
• Subjects: photonic crystals -- pseudo-photonic crystals -- slot waveguides -- slot resonators; Nanotechnology -- Periodicals; Nanotechnology -- Periodicals; Nanotechnology; Publications périodiques; Nanotechnologies; Periodicals; 620.5
• DOI: 10.1088/1361-6528/ab3d74
• Languages: English
• ISSNs: 0957-4484

Abstract

Abstract: In recent years, novel high-performance nanophotonic devices have been realized by applying ultrathin two-dimensional nanolayer materials to nanophotonics. In this paper, we propose nanolayer-embedded compact pseudo-photonic crystals (PPCs) that enable strong interaction between ultrathin nanolayers and photonic crystal modes. In typical two-dimensional slab photonic crystals, the transverse-magnetic (TM) photonic crystal bandgap is not well formed, making it difficult to operate the TM photonic crystal waveguide modes. However, by utilizing the low-frequency TM PPC bands, a long propagation TM waveguide mode, a slow TM waveguide mode, and a TM photonic bandgap are all readily available. In particular, the insertion of a nanometer-thick low-refractive-index layer in the vertical center of TM PPC waveguide can localize the electric fields tightly in nanometer space, causing strong field interaction with the inserted nanolayer material. Using the TM slow light near PPC band edges, field interaction with the nanolayer is significantly enhanced. We can also realize nanolayer-embedded high-quality-factor ( Q -factor > 10 4 ) PPC cavities using the TM PPC bandgap. We believe that the proposed TM PPCs will play an important role in the strong interaction of ultrathin nanolayer materials with photonic crystal modes.