Proposal for Ultralow Loss Hollow-Core Plastic Bragg Fiber With Cobweb-Structured Cladding for Terahertz Waveguiding

The transmission losses of a terahertz (THz) wave in a hollow-core Bragg fiber with cobweb cladding are analyzed. The numerical results show that the losses in the wavelength range of 70-1000 mum are below 8.5times10
^-5
dB/cm. The lowest loss of 9.03times10
^-6
dB/cm or 2.08times10
^-6
cm
^-1
is obtained for Fiber A at 90mum. The losses in this new class of Bragg fibers are reduced to far lower than those of other fibers for a THz wave reported so far in the literature