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We numerically studied a high-output-transmission-efficiency low-reflection-loss 120&#x00B0; photonic crystal (PhC) waveguide bend based on a PhC slab with triangular-lattice air holes. The desired high output transmission efficiency was achieved by introducing flexible structural defects into the bend region of the waveguide. Simulation results obtained using a 3-D finite-difference time-domain method indicated that normalized output transmission as high as 94.3% and negligible normalized reflection loss of 0.1% were obtained at the 1550-nm optical wavelength. Furthermore, the normalized output transmission was more than 90% within the entire optical C-band. In addition, sensitivity of the design parameters of the structural defect was studied to understand the tolerance in the fabrication error, while maintaining high output transmission efficiency.

ieee photonics journal

High-Transmission-Efficiency 120 <inline-formula> <tex-math notation="TeX">$^{\circ}$</tex-math></inline-formula> Photonic Crystal Waveguide Bend by Using Flexible Structural Defects

High-Transmission-Efficiency 120 $^{\circ}$ Photonic Crystal Waveguide Bend by Using Flexible Structural Defects