Gao, W.Lee, W.S.L.Yu, X.Fujita, M.Nagatsuma, T.Fumeaux, C.Withayachumnankul, W.2021-04-062021-04-062021IEEE Transactions on Terahertz Science and Technology, 2021; 11(1):28-412156-342X2156-3446http://hdl.handle.net/2440/129998Effective-medium-clad dielectric waveguides are purely built into a single high-resistivity float-zone silicon wafer with their claddings defined by deep subwavelength perforations. The waveguides are substrate-free while supporting both E x 11 and E y 11 modes with low loss and low dispersion. This article extends the investigations of the waveguides by analyzing the dispersion, cross-polarization, and crosstalk together with the characteristics of bends and crossings over an operation frequency range of 220- 330 GHz (WR-3 band). Taking the E x 11 mode as an example, the experimental results show an average measured attenuation coefficient of 0.075 dB/cm and a group velocity dispersion ranging from around ±10 ps/THz/mm across the whole band. A crosstalk level below -10 dB is measured for parallel waveguides with a separation of 0.52λ 0 at 300 GHz. The realized waveguides show a bending loss ranging from 0.500 to 0.025 dB per bend and a crosstalk at crossing below -15 dB from 220 to 330 GHz. Due to the different dispersion characteristics, the E y 11 mode has similar performances but with its operation frequency range reduced to 260-330 GHz. Limited by the measurement setup, a cross-coupling between the E x 11 and E y 11 modes is measured to be below -20 dB over the whole band. This in-depth investigation of effective-medium-clad waveguides will form a basis for terahertz-integrated platforms.en© 2021, IEEEOptical waveguides; silicon; dispersion; dielectrics; permittivity; crosstalkJournal article100003318310.1109/TTHZ.2020.30239170006065825000032-s2.0-85099253755562264Gao, W. [0000-0002-6082-6993]Lee, W.S.L. [0000-0001-7760-6121]Fumeaux, C. [0000-0001-6831-7213]Withayachumnankul, W. [0000-0003-1155-567X]