Abstract
We have investigated, both experimentally and numerically, the transmission of terahertz (THz) electromagnetic waves in indium antimonide waveguides with stubs along the waveguide. The resonant transmission characteristics of the device at THz frequencies are exploited for sensing biological samples. The transmission characteristics of the waveguide were simulated using finite element method techniques for various sizes of waveguide width and stub length. The waveguides were fabricated by laser micromachining, and their transmission characteristics were measured by terahertz time-domain spectroscopy. The experimental results are consistent with the simulation results. The stubs of the device were loaded with bovine serum albumin (BSA) protein molecules dissolved in water. A significant change in the THz transmission coefficient was observed for different concentrations of BSA, thus indicating the potential of the device for bio-sensing. The calculated absorption coefficients of the BSA samples agree well with the reported ones.
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