Design of GaN-based photonic crystal surface emitting lasers with top TiO2 photonic crystals

• DOI: 10.1016/j.rinp.2021.105164
• Publication Date: 2021-12-30T07:27:53Z
• Authors: Qifa Liu; Jingtong Bin; Kerui Feng; Lu Cheng; Lianjie Zhao; Guohua Wu; Jing Chen
• Keywords: Cladding (metalworking); Lattice constant

We designed GaN-based blue photonic crystal surface emitting lasers (PCSELs) by incorporating a TiO2 (PhC) layer on top of the GaN surface. An AlGaN cladding was under active region to form waveguide-like cap layer. The dimension layer, lattice constant PhC, hole radius, and thickness were investigated optimize structure design in view PhC confinement factor gain threshold. With depth 100 nm layers, radius 40 nm, layers above below multiple quantum wells (MQWs), greater than 10% threshold 400 cm−1 can be realized. Furthermore, band diagram is calculated, which shows that PCSELs are operated at Γ1 edge with lowest pump energy. This work demonstrates potential excellent properties future laser sources.