基于二维光子晶体的多波段太赫兹波4×2编码器OA北大核心

In order to expand the applicable band range of the encoder,a multi-band Terahertz wave 4 x2 encoder based on two-dimensional photonic crystals is designed.The performance of the encoder is thoroughly studied and analyzed using Rsoft software combined with the plane wave expansion(PWE)method and the finite-difference time-domain(FDTD)method.The re-search results indicate that the output transmittance of the encoder varies with the lateral offset of the dielectric pillars at the waveguide branch.After optimizing the design of the Terahertz wave 4×2 encoder,it can achieve high-contrast 4x2 encoding log-ic functions in the wavelength ranges of 103.80～108.57 μm,109.19～111.12 μm,and 111.94～114.08 μm,with a contrast ratio of no less than 9.30 dB and a maximum of 29.47 dB,and a response time is not more than 16.04 ps.