Hung-chun Chang

TL;DR: Using commercially available Teflon air pipes, it is experimentally confirmed that THz waves can be successfully guided in the central air core of 3-m-long pipes with excellent mode qualities, high coupling efficiencies, low attenuation constants, and controllable passband width.

TL;DR: Numerical results reveal that the guiding mechanism of the leaky core modes, which transmit most of the power in the air-core region, is that of the antiresonant reflecting guiding.

TL;DR: Eigenvalue equations for solving full-vector modes of optical waveguides are formulated using Yee-mesh-based finite difference algorithms and incorporated with perfectly matched layer absorbing boundary conditions to calculate the complex propagation constants and the confinement losses of leaky waveguide modes.

TL;DR: In this article, a general relation between a sampled point and its nearby points is derived and the derived relation and the generalized Douglas scheme are extended to fourth order accuracy irrespective of the existence of the step-index interfaces.

TL;DR: In this paper, the dependence of nanoparticle size on surface-enhanced Raman scattering (SERS) from silver film over nanospheres substrate is studied for a range of nanosphere sizes from 430 to 1,500 nm, with a nanosphere size of 1,000 nm at an excitation wavelength of 532 nm.