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A two-dimensional (2D) optimized nanotaper mode converter is presented and analyzed using the finitedifferencetime-domain (FDTD) method.It can convert the mode size in a silicon pillar waveguide (PWG)from 4 μm to 1 μm over a length of 7 μm and achieve a transmission efficiency of 83.6% at a wavelengthof 1.55 μm.The dual directional mode conversion of the nanotaper and its ability to perform modecompression and expansion are also demonstrated.The broadband with high transmittance is satisfied inthis structure.Using this silicon-based nanotaper,mode conversion between integrated photonic devicescan be more compact and efficient.
A two-dimensional (2D) optimized nanotaper mode converter is presented and analyzed using the finited time-domain (FDTD) method. It can convert the mode size in a silicon pillar waveguide (PWG) from 4 μm to 1 μm over a length of 7 μm and achieve a transmission efficiency of 83.6% at a wavelength of 1.55 μm. The dual directional mode conversion of the nanotaper and its ability to perform mode compression and expansion are also demonstrated. The broadband with high transmittance is satisfied in this structure. Using this silicon-based nanotaper, mode conversion between integrated photonic devicescan be more compact and efficient.