Design optimization of a low-loss and wide-band sharp 120° waveguide bend in 2D photonic crystals

Yuan, Jianhua; Yang, Jinsheng; Shi, Dan; Ai, Wenbao; Shuai, Tianping

doi:10.1016/j.optcom.2016.01.048

Cited by 16 publications

(1 citation statement)

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“…Taking n eff =3.476, the dispersion diagrams showing normalized frequency versus in-plane wave vector for TE-modes of the infinite two-dimensional PhC structure are given in figure 2. The triangular lattice exhibits a band gap only for the TEmodes in the frequency range of 0.225 2<L/λ<0.347 5, based on the plane wave expansion method [38]. The dashdot horizontal line marks the normalized frequency with λ=1550 nm.…”

Section: Physical Problemmentioning

confidence: 99%

Numerical optimization design for waveguide bends with low-loss and wide-bandwidth in two-dimensional photonic crystal slabs

Zhang¹,

Yuan²,

Ai³

2019

J. Opt.

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In this paper, we demonstrate some optimization designs for waveguide bends in two-dimensional photonic crystal slabs based on the effective index approximation. Four different types of waveguide bends with low-loss and wide-bandwidth are designed, which involve 60°, Z-shaped, Y-shaped and 120° waveguide bends in the two-dimensional triangular lattice photonic crystals. In all numerical experiments, the electromagnetic fields in the photonic crystal slab waveguides are solved by the finite element method in COMSOL software. Several strategies are applied to design slab waveguide bends with low-loss and wide-bandwidth, for example, adding some elliptical air-holes near the corner or adjusting the radii of some air-holes. For four optimized structures, the transmission efficiencies at 1550 nm are all more than 92%. As we show, this is achieved over a −0.915 dB bandwidth of more than 65 nm in all waveguide bends. The numerical results indicate that the design scheme we applied to optimize waveguide bends in photonic crystal slabs is simple and efficient, which can provide some useful guidance for further three-dimensional design.

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Section: Physical Problemmentioning

confidence: 99%